53 (3) • August 2004: 637–655
Funk & al. • Evolution of the tribe Arctoteae
A S T E R AC E A E
Insights into the evolution of the tribe Arctoteae (Compositae: subfamily
Cichorioideae s.s.) using trnL-F, ndhF, and ITS
Vicki A. Funk1, Raymund Chan2 & Sterling C. Keeley2
1 U.S.
National Herbarium, Smithsonian Institution MRC 166, P.O. Box 37012, Washington D.C. 20013 U.S.A.
funk.vicki@nmnh.si.edu (author for correspondence)
2 Department of Botany, University of Hawaii at Manoa, Hawaii 96822, U.S.A. raymundc@hawaii.edu; sterling@hawaii.edu
Compositae (Asteraceae) are the largest flowering plant family (23,000 to 30,000 species) and its members are
found throughout the world in both temperate and tropical habitats. The subfamilies and tribes of Compositae
remained relatively constant for many years; recent molecular studies, however, have identified new subfamilial groups and identified previously unknown relationships. Currently there are 35 tribes and 10 subfamilies (Baldwin & al., 2002; Panero & Funk, 2002). Some of the tribes and subfamilies have not been tested for
monophyly and without a clear understanding of the major genera that form each tribe and subfamily, an accurate phylogeny for the family cannot be reconstructed. The tribe Arctoteae (African daisies) is a diverse and
interesting group with a primarily southern African distribution (ca. 17 genera, 220 species). They are especially important in that most of the species are found in the Cape Floral Kingdom, the smallest floral kingdom
and the subject of intense conservation interest. Arctoteae are part of the monophyletic subfamily
Cichorioideae s.s. Other tribes in the subfamily include Eremothamneae, Gundelieae, Lactuceae, Liabeae,
Moquineae, and Vernonieae, and these were all evaluated as potential outgroups. Ultimately 29 ingroup taxa
and 16 outgroup taxa with a total of 130 sequences (125 newly reported), from three genetic regions, two from
chloroplast DNA (trnL-F and ndhF) and one from the nuclear genome (ITS), were used to evaluate the tribe
and its proposed outgroups. Each molecular region is examined separately, the chloroplast markers are examined together, and the data are combined. The data were analyzed with and without outgroups and problem taxa
using parsimony and maximum likelihood methods. The analyses showed robust support for two outgroup
clades, Liabeae-Vernonieae and Gundelieae-Lactuceae and two main subtribes within Arctoteae: Arctotineae
and Gorteriinae. Support for monophyly of Arctoteae is weak. Within Arctoteae, some taxa of interest are easily placed: Didelta, Cuspidia and Heterorhachis are consistently part of subtribe Gorteriinae, Cymbonotus, the
Australian genus, is nested within subtribe Arctotineae, and Haplocarpha is at the base of Arctotineae.
Berkheya, Haplocarpha, and Hirpicium are probably paraphyletic. Furthermore, Platycarpha most likely does
not belong in Arctoteae, and Heterolepis and the tribe Eremothamneae are within Arctoteae but not within
either of the two main subtribes. After some rearrangements, the two main subtribes, Arctotineae and
Gorteriinae, are monophyletic and the latter has three clades. The study shows that the unusual taxa are of critical importance, and they should be included in any molecular analysis. Adequate representation of the ingroup
is also important as all previous studies of Arctoteae had involved only a few taxa from the core subtribes, and
so did not reveal the problems. Multiple outgroups evaluated in an iterative manner had pronounced effects on
the relationships within the ingroup, not only on the position of the root. Finally, unrooted consensus trees and
unrooted phylograms were found to be very useful in analyzing the data, allowing for examination of placement of taxa without the bias of a rooted tree.
KEYWORDS: Arctoteae, Asteraceae, Cape Floral Kingdom, Cichorioideae, Compositae, ITS, molecular phylogenetics, ndhF, outgroups, South Africa, trnL.
INTRODUCTION
The Compositae family has the largest number of
species of any family of seed plants (23,000–30,000),
and today its members can be found on every continent
except Antarctica. The subfamilial classification has had
minor revisions, but until recently it had not seriously
changed since the 13 tribes of Bentham (Bentham,
1873a, b). The advent of DNA sequence data from the
chloroplast and nuclear genomes has changed
Compositae systematics in dramatic ways: first, they
have identified basal clades that turned the ideas about
637
Funk & al. • Evolution of the tribe Arctoteae
evolution within the family upside down (Jansen & al.,
1991; Kim & Jansen, 1995) and second, more recently
by revisions that have divided the family into 10 subfamilies and 35 tribes (Baldwin & al., 2002; Panero &
Funk, 2002; Panero & al., unpubl.). Many of the traditional tribes had broad distributions covering hemispheres (i.e., Lactuceae, Heliantheae s.l.), or nearly the
whole globe (e.g., Senecioneae). Three of the more modestly sized tribes, Arctoteae (southern Africa and
Australia), Calenduleae (southern Africa), and Liabeae
(Andean South America, Central America, Mexico, and
the Caribbean), have rather restricted distributions and
therefore lend themselves to detailed systematic and biogeographic investigations. One of these, Arctoteae, is the
subject of our investigation. This tribe is particularly
interesting not only because it is more or less confined to
southern Africa, but also because most of its species are
endemic to the Cape Floral Kingdom.
The tribe Arctoteae belongs to the redefined subfamily Cichorioideae s.s. (Panero & Funk, 2002). The subfamily contains from four to seven tribes, depending on
where the member taxa are found in the final analysis
and on one’s personal philosophy with regard to
Compositae classification. The four traditional and larger tribes are Arctoteae (African daisies), Lactuceae (or
Cichorieae; dandelions), Liabeae (Andean sunflowers),
and Vernonieae (ironweeds). The three small tribes (with
one or two genera each) are Eremothamneae
(Eremothamnus and Hoplophyllum; authors for all genera are found in Table 1), Gundelieae (Gundelia, crown
53 (3) • August 2004: 637–655
of thorns), and Moquineae (Moquinea and
Pseudostifftia). None of the relationships among the
tribes have been resolved, and some of the taxa are not
universally accepted at the tribal level. For purposes of
this study, Vernonieae, Liabeae, and Lactuceae were
included as potential outgroups for Arctoteae. The tribe
Moquineae was assumed to be close to, if not actually in,
the Vernonieae clade and was not included. The genera of
Eremothamneae were treated as part of Arctoteae and
Gundelia was originally treated as part of Arctoteae, but
it eventually fell outside the tribe.
Data from a variety of sources (Cassini, 1816, 1821;
Beauverd, 1915a, b; Robinson & Brettell, 1973a;
Norlindh, 1977; Robinson, 1992, 1994; Bremer, 1994;
Herman & al., 2000; Leistner, 2000) as well as personal
observations show that the tribe Arctoteae does not have
an abundance of characters to support its monophyly.
Beginning with Cassini, the traditional definition of
Arctoteae was based on the presence of a swollen area
with a ring of hairs located just below the branch point
on the style. While there are hairs in a ring just below the
division in the style, this character is also found in some
thistles, and the presence of a swollen area is found mostly in the subtribe Arctotinae. Members of the two main
subtribes of Arctoteae have sagittate but not tailed
anthers (except for Arctotis which has calcarate, short
caudate anthers), and the heads usually have both ray and
disc florets. The stigmatic papillae are spread over the
inner surfaces of the style branches, but this character is
found in many tribes in the bottom third of the family
Table 1. Highlights of classification and nomenclature of the tribe Arctoteae (Compositae). Numbers in parentheses
indicate the number of species in the genus.
Traditional (modified
Bentham, 1873b)
Robinson & Brettell, 1973
Subtribe Arctotinae Less.
Arctotheca Wendl. (4)
Arctotis L. (~64)
Cymbonotus Gaud. (2)
Dymondia Compton (1)
Haplocarpha Less. (10)
Subtribe Gorteriinae Benth. & Hook. f.
Berkheya Ehrh. (~75)
Cullumia R. Br. (15)
Cuspidia Gaertn. (1)
Didelta L’Herit (2)
Gazania Gaertn. (17)
Gorteria L. (3)
Heterolepis Cass. (3)
Heterorhachis Sch. Bip. (1)
Hirpicium Cass. (12)
Subtribe Gundeliinae Bentham
Gundelia L. (1)
Tribe Gundelieae H. Rob. & Brettell
Eremothamnus O. Hoffm. (1) Tribe Eremothamneae H. Rob. & Brettell
Platycarpha Less. (3)
Tribe Cynareae
Hoplophyllum DC. (2)
Ursinia Gaertn.
638
Tribe Ursinieae H. Rob. & Brettell
Heywood & al.
(various chapters), 1977
Bremer, 1994
Arctotinae
Arctotinae
Arctotinae
Arctotinae
Arctotinae
Arctotinae
Arctotinae
Arctotinae
Arctotinae
Arctotinae
Gorteriinae
Gorteriinae
Gorteriinae
Gorteriinae
Gorteriinae
Gorteriinae
Gorteriinae by Norlindh,
Mutisieae by Merxmüller
Gorteriinae
Gorteriinae
Gorteriinae
Gorteriinae
Gorteriinae
Gorteriinae
Gorteriinae
Gorteriinae
unassigned to subtribe
Subtribe Gundeliinae
Subtribe Eremothamninae Lenis
Tribe Cynareae (Norlindh)
(rejected by Dittrich)
Tribe Vernonieae
Tribe Anthemideae
Subtribe Gorteriinae
unassigned to tribe
unassigned to subtribe
Gorteriinae
Gorteriinae
unassigned to tribe
Tribe Anthemideae
53 (3) • August 2004: 637–655
phylogeny. The pappus is usually made up of scales
(absent in Cymbonotus and Cullumia), but Heterolepis
has what has been described as “bristle-like” scales.
Most members of the tribe are annual or perennial herbs,
but some are shrubs or subshrubs; most have yellow
flowers, but there are some noticeable exceptions such as
Arctotis and Gazania (Figs. 1B, C, E). All of the species
in the Arctoteae, except those in Cymbonotus (2–3
species, Australia), are native to southern Africa.
The tribe Arctoteae was first recognized by Cassini
(1816) who described a total of 14 genera, three of which
were later placed in synonymy. In 1832, Lessing reduced
the group to the rank of subtribe within the tribe
Cardueae (thistles); he recognized 18 genera, including
five new ones. Most modern treatments are based on the
work of Bentham (Bentham, 1873a, b) who reinstated
Arctoteae at the tribal level with three subtribal groups:
Euarctoteae (now Arctotinae), Gorterieae (Gorteriinae),
and Gundelieae (Gundelinae). Hoffmann (1890) used
Bentham’s subtribes, but he interpreted the genus
Arctotis in the broad sense, encompassing most of the
modern-day genera of the subtribe. Minor movements of
problem genera ensued. Bentham (1873b) removed
Heterolepis from Arctoteae and placed it in Inuleae.
Hoffmann placed Eremothamnus in Senecioneae (1890).
Beauverd (1915a) transferred Ursinia from Arctoteae to
Anthemideae based on style morphology. Moore (1929)
moved Eremothamnus into Inuleae, and Merxmüller
(1967) put it back into Senecioneae. Stix (1960) suggested that Platycarpha should be in Mutisieae. Prior to 1970
Eremothamnus had been placed in the tribes
Senecioneae, Liabeae, Astereae, Gnaphalieae, and
Inuleae, but in 1970 Leins suggested that Eremothamnus
was in Arctoteae, close to but not inside Gorteriinae. In
1973, Robinson and Brettell (1973a) took Ursinia out of
Arctoteae and put it into its own tribe based on pollen
characters. Also in the same publication, Robinson and
Brettell put Platycarpha in Cardueae (thistles) and
returned Heterolepis to Arctoteae. In that same year,
Robinson & Brettell (1973b) moved both Eremothamnus
and Gundelia into tribes of their own.
In the book Biology and Chemistry of the
Compositae (Heywood & al., 1977), each tribe was discussed in one or more chapters, and comments were
made concerning the placement of problem taxa.
Norlindh (1977) prepared the treatment of Arctoteae; he
accepted the three subtribes of Bentham and added the
subtribe Eremothamninae while excluding Platycarpha
and Ursinia. Dittrich (1977) in his treatment of the thistles (Cardueae) rejected both Platycarpha and Gundelia
and suggested that they should be placed in Arctoteae.
Merxmüller (1977), in his treatment of Inuleae, agreed
that Heterolepis did not belong in that tribe and suggested a placement in Mutisieae, and Jones (1977) included
Funk & al. • Evolution of the tribe Arctoteae
Hoplophyllum in Vernonieae. Heywood & Humphries
(1977) placed Ursinia into Anthemideae but considered
the placement dubious. More recently, Karis (1992) published a cladistic study based on morphology that suggested that Hoplophyllum was sister to Eremothamnus,
and he had moderate support for the two genera being
closely related to Arctoteae. Robinson (1994) used pollen
data to support his hypotheses that Gundelia and
Eremothamnus belonged in tribes of their own and not in
Arctoteae. Bergqvist & al. (1995) used cpDNA restriction site data from 58 genera of the family to examine the
position of Eremothamnus and found that it was sister to
Arctoteae, but he used only one genus (Gazania) from
Arctoteae. The most recent classification of Arctoteae
was published by Bremer (1994); he recognized only the
two main subtribes by sinking Gundelieae into
Gorteriinae. He listed Eremothamnus and Hoplophyllum
as belonging to the subfamily Cichorioideae s.l. but
“unplaced” as to tribe. Karis & al. (2001) used sequence
data from ndhF to suggest that Gundelia did not belong
in Arctoteae but was the sister group of Cichorieae
(Lactuceae). Based on these data, Gundelia could be
included in Lactuceae or left in its own monotypic tribe,
Gundelieae. Most recently the Saharan genus Warionia
has been shown to be closely related to, and possibly the
sister taxon of, Gundelia (Panero & Funk, 2002), and
these two together now constitute Gundelieae and are
sister to Lactuceae. Ursinia has been placed in
Anthemideae based on morphological and molecular
data (Heywood & Humphries, 1977; Watson & al.,
2000). However, problems remain concerning the placement of several genera: Eremothamnus, Heterolepis,
Hoplophyllum, and Platycarpha. In addition, Cuspidia,
Didelta, Haplocarpha, and Heterorhachis are unusual
taxa morphologically, and a confirmed placement of
these genera would help with understanding the evolution of the morphology of the tribe. Heterorhachis and
Cuspidia are monotypic genera that have unusual features, Haplocarpha has a variable chromosome number,
and Didelta has an unusual condition where its receptacle breaks into parts enclosing the achenes. The outer
parts are adnate to one of the outer involucral bracts that
become thickened and lignified and new plants may germinate out of these parts (Fig. 1A). Finally, Cymbonotus,
the only genus found outside of southern Africa, may be
designated “endangered” in its native Australia and so its
position in the tribe needs to be confirmed. Table 1 presents an historical summary of taxonomy of Arctoteae.
The ultimate goal of our research effort is to produce
a detailed morphological study and molecular analysis of
Arctoteae and to use the results to investigate the evolution and biogeographical history within the tribe and
among tribes of the subfamily Cichorioideae s.s.
Obviously, this task will take some time and involve sev639
Funk & al. • Evolution of the tribe Arctoteae
53 (3) • August 2004: 637–655
Fig. 1. Variation in shape and color of heads in the mostly southern African tribe Arctoteae. A, Didelta; B, C, Arctotis;
D, Berkheya; E, Gazania. All photos by V. Funk.
640
53 (3) • August 2004: 637–655
eral projects. The goals of this paper are to investigate
the monophyly of Arctoteae, determine the sister
group(s) and/or most appropriate outgroup(s), determine
placement of problem and unusual genera, and establish
a sound basis for a subtribal classification of the tribe.
MATERIALS AND METHODS
Taxon sampling. — The terms “ingroup” and
“outgroup” are, of course, relative to one another and
change based on the specific question being addressed.
For this study we consider the ingroup to include all taxa
that were previously thought to be in the tribe Arctoteae,
with the exception of Ursinia (now in Anthemideae).
These ingroup genera were sampled thoroughly by
including several species of each genus so that all
“groups” within the genera were sampled. At least two
populations were sampled in the monotypic genera. The
first set of outgroups for this study included all taxa outside of traditional Arctoteae that are found in the subfamily Cichorioideae s.s. (Appendix). A second set of
outgroups from outside the subfamily were added later
(Appendix). In general, all outgroup taxa were sampled
less thoroughly than the ingroup taxa.
Ingroup. Seventeen ingroup genera were used in
this study, including all but one of the genera previously
placed in Arctoteae (excluding Ursinia: Anthemideae). A
total of 76 samples was analyzed and 28 of these ingroup
samples (Appendix) were selected to be used in the
pruned tree. There are 78 newly reported sequences, 26
ITS, 27 trnL-F, and 25 ndhF, and two taken from
GenBank.
Outgroups. Sixteen species in 15 outgroup genera
were sampled for this study (Appendix). There are 44
newly reported sequences, 14 ITS, 15 trnL-F, and 15
ndhF, one sequence was taken from GenBank and two
were sent by J. Panero (pers. comm.).
The tribes of Cichorioideae s.s. (Arctoteae, Eremothamneae, Gundelieae, Lactuceae, Liabeae, Moquineae,
and Vernonieae) form a monophyletic group with good
support (Panero & Funk, 2002); the relationships among
these tribes, however, is poorly understood. All of the
tribes were considered as possible outgroups for
Arctoteae, but only four were used. The Eremothamneae
were considered by Norlindh (1977) to be part of
Arctoteae, so it was included in the ingroup. Gundelieae
(as Gundelia) was also included in Arctoteae by
Norlindh (1977) and Bremer (1994), but, based on ndhF
sequence data, Karis suggested that Lactuceae and
Gundelia were sister taxa (Karis & al., 2001). Our initial
analyses supported this, and so the tribe Gundelieae was
moved to the outgroup. The Gundelieae were, until
recently, believed to be monotypic, but they have now
Funk & al. • Evolution of the tribe Arctoteae
been shown to contain Warionia as well as Gundelia
(Panero & Funk, 2002); both genera were used in this
study. Lactuceae, morphologically distinct but poorly
known molecularly, was represented by three common
genera (Cichorium, Hypochaeris, and Lactuca). The taxa
from Liabeae, a modest-sized tribe from the Americas,
were selected because they represent the two main lineages of the tribe and one member of the paraphyletic base
of the tribe (Kim & al., 2003). Vernonieae, a large and
diverse tribe with ca. 2500 species, was included as an
outgroup. The taxa from Vernonieae used in the study
were selected because they were near the base of the preliminary trees produced in an ongoing molecular study of
the tribe (Keeley & Chan, pers. comm.). Previously it has
been suggested that Vernonieae and Liabeae might be
closely related, in fact Cassini had Liabeae as a subunit
of Vernonieae (Cassini, 1828, 1830) and other authors
have also placed the two together (e.g., Robinson &
Funk, 1987; Bergqvist & al., 1995). Moquineae were
considered to be part of Vernonieae and were not included in this study. Once the data were combined, additional outgroups could be added from outside of subfamily
Cichorioideae including Barnadesia and Dasyphyllum
from subfamily Barnadesioideae, Gerbera (two species)
from the tribe Mutisieae s.s., and Carthamus and Cirsium
from the tribe Cardueae (thistles).
The DNA sequences were obtained from several
sources. Ongoing studies by Keeley and Chan (unpubl.)
provided sequences for Vernonieae. Panero (unpubl.)
provided the trnL-F and ndhF for Warionia. GenBank
provided two ITS sequences (Hoplophyllum and
Warionia) and one ndhF (Eremothamnus). Although we
tried repeatedly to obtain additional sequences from
Eremothamnus, we were unsuccessful; these two
regions, therefore, are missing for this taxon. It does not
appear to have created any problems, however; all ndhF
and combined analyses were conducted with and without
the genus, and it made no difference in the results. The
remaining 125 sequences are newly reported; the
Appendix contains a list of vouchers and the GenBank
numbers for all sequences. All plant tissue was collected
in the field and stored in silica gel, sampled from herbarium specimens, or freshly collected.
DNA amplification, sequencing, and analysis. — DNA extractions were performed using a Qiagen
DNeasy Plant Mini Kit following the instructions supplied but with an extended incubation period (up to 40
minutes) for herbarium material. Primer ITS5A (Downie
& Katz-Downie, 1996), based on White & al.’s (1990)
fungal primer ITS5 and corrected at two positions for
angiosperms, was substituted for ITS5 in this study. All
primer sequences are given in Table 2. Primers used to
amplify and sequence the trnL-F and downstream trnL-F
spacer region of cpDNA were designed by Taberlet & al.
641
Funk & al. • Evolution of the tribe Arctoteae
(1991), and those used for the 3' end of the ndhF region
were designed by Jansen (1992).
For the PCR amplification reactions, each 25 µl PCR
reaction cocktail contained 12.9 µl of sterile water, 2.5 µl
of 10x PCR reaction buffer A (Promega), 2 µl of 20 mM
dNTPs (Pharmacia) in an equimolar ratio, 2.5 µl of 25
mM magnesium chloride, 0.5 µl of 10 mg/µl Bovine
Serum Albumin (Sigma), 1 µl of a 10 µM concentration
each of the forward and reverse primer, 0.1 µl of Taq
DNA polymerase enzyme (5 units/µl from Promega),
and 2.5 µl of sample DNA. The amount of template DNA
was adjusted when necessary to generate sufficient PCR
products for DNA sequencing.
The amplification reactions were conducted using
thin-walled 0.2 ml PCR reaction tubes in a GeneAmp
PCR System 9700 (Perkin Elmer). The PCR program
consisted of an initial preheating at 94º C for 2 minutes.
Then, the first reaction cycle proceeded as follows: 1
minute at 94º C to denature the template DNA, followed
by 1 minute at 48º C (54º C for cpDNA) to allow primer
annealing and 45 seconds at 72º C for primer extension.
Primer extension time was increased by 4 seconds (7 seconds for cpDNA) for each subsequent reaction cycle.
After a total of 40 reaction cycles, an additional 7 minute
extension at 72º C was allowed for completion of unfinished DNA strands. All PCR products were quantified by
agarose gel electrophoresis with comparison of an
aliquot of products with a known quantity of a 100 bp
DNA ladder (GeneChoice; visualized with ethidium bromide). The remainder was stored at 4º C until utilized.
PCR products used for sequencing were first purified for sequencing using an enzymatic PCR product presequencing kit (USB). This procedure involved mixing 8
µl of the PCR product with 1 µl of each enzyme from the
kit and then incubating the mixture first at 37º C for 30
min, to degrade excess primers and dNTPs, and then
raising the temperature to 80º C for 15 minutes, to denature the enzymes themselves. This method of purification
without loss of PCR products (no filtration, precipitation,
or washes are necessary) is especially important for
DNA extracted from herbarium vouchers, which is sometimes only weakly amplified and yields barely sufficient
PCR product for sequencing.
Table 2. Primer sequences used for PCR and cycle
sequencing.
Name
Sequence (5' to 3')
ITS5A
ITS4
trnL C
trnL F
ndhF 1603
ndhF +607
GGA AGG AGA AGT CGT AAC AAG G
TCC TCC GCT TAT TGA TAT GC
CGA AAT CGG TAG ACG CTA CG
ATT TGA ACT GGT GAC ACG AG
CCT YAT GAA TCG GAC AAT ACT ATG C
ACC AAG TTC AAT GYT AGC GAG ATT AGT C
642
53 (3) • August 2004: 637–655
The cycle sequencing reactions were done using
96 well microplates in a PTC-100 thermal cycler (MJ
Research). Each one-eighth cycle sequencing reaction
cocktail contains 50–150 ng of the purified PCR product,
2 µl of a 1 mM concentration of the sequencing primer,
0.6 µl of a 5x reaction buffer (400 mM Tris HCl, 10 mM
magnesium chloride at pH 9.0), and 1 µl of the reagent
pre-mix from the BigDye (Version 2/3) dye terminator
cycle sequencing pre-mix kit (Applied Biosystems). The
cycle sequencing program consisted of an initial preheating at 96º C for 30 seconds. Then, the first reaction cycle
proceeded as follows: 10 seconds at 92º C to denature the
template DNA, followed by 15 seconds at 55º C to allow
primer annealing and 4 minutes at 60º C for primer
extension. Unincorporated dye terminators were
removed by Sephadex (Sigma) gel filtration using
MultiScreen plates (Millipore). The purified cycle
sequencing products were then resolved by electrophoresis on a 5% polyacrylamide (MJ Research Kilobasepack)
gel using a BaseStation 51 automated DNA sequencer
(MJ Research). Sequences from both strands of each
PCR product were examined, compared, and corrected
using Sequence Navigator software (Applied
Biosystems).
All trnL-F, ndhF, and ITS sequences were aligned
visually, with the insertion of gaps where necessary.
There were five unambiguous insertions and deletions,
mainly in the trnL-F data set. Three deletions and one
insertion supported all or part of the Gazania-GorteriaHirpicium clade. The remaining deletion (ndhF) was
found in all of the ingroup and first set of outgroups
(Cichorioideae s.s.) but not in the second set of outgroup
taxa. The taxon groups that these indels supported
occurred in the phylogenies without coding the indels
(see Results), so it did not seem necessary to separately
code the indels. Maximum parsimony analysis and parsimony bootstrap analysis (with 1000 replicate runs, each
with 10 random taxon additions, TBR branch swapping,
and MULPARS in effect) of the aligned trnL-F, ndhF,
and ITS sequences were performed (with and without the
outgroups) for each region and for the cpDNA data and
the combined data sets via full heuristic searches with
PAUP* (Swofford, 2002). No weighting was used.
Maximum parsimony analysis using a branch-and-bound
search was also performed with a reduced dataset of 17
ingroup and three outgroup taxa selected from previous
results. The bootstrap runs employed 1000 replicates
with branch-and-bound searches. The likelihood ratio
tests were done using the “Tree Scores” function in
PAUP* under the likelihood criterion, the HasegawaKishino-Yano model of sequence evolution (Hasegawa
& al., 1985), and a gamma distribution of rate variation
among sites (with the shape parameter estimated and
with four rate categories). The likelihood and the boot-
53 (3) • August 2004: 637–655
Funk & al. • Evolution of the tribe Arctoteae
ARCT
strap analyses were used on each molecular region separately, the two chloroplast regions combined, and all
three regions combined.
Arctotis 14
Arctotis 08
Cymbonotus 45
Arctotheca 95
Haplocarpha 77
Dymondia 53
RESULTS
A number of full heuristic searches were run using
various outgroups and adding and subtracting members
of the ingroup. These initial runs contained all taxa and
all outgroups. These runs produced thousands of equally
parsimonious trees, but they consistently showed several
things. The core elements of two subtribes formed
strongly supported clades, Arctotineae (ARCT) and
Gorteriinae (GORT), and within Gorteriinae there are
three groups, the Didelta-Berkheya clade (Did),
Berkheya-Cullumia clade (Ber), and the GazaniaGorteria-Hirpicium clade (Gaz). Berkheya appears to be
paraphyletic and Hirpicium and Haplocarpha are most
likely paraphyletic as well. The 10 outgroup taxa from
the first set of outgroups (Appendix 1) consistently
divided into two clades, Liabeae and Vernonieae (LIAVER) and Gundelieae and Lactuceae (GUN-LAC).
However, the placement of some of the problem taxa, as
well as the relationships of the outgroups to the clades
within the ingroup and to one another, was unresolved.
An examination of many of the equally parsimonious
trees showed that most of the alternative trees were the
result of closely related taxa changing positions. In order
to elucidate relationships among the problem taxa, outgroup taxa, and core subtribes, some taxa were pruned
from the dataset. For instance, in the full dataset there
were eight samples of Arctotis, 18 of Berkheya, nine of
Gazania, and nine of Hirpicium and all of these were not
pertinent to the goals of this study. In order to decide
which taxa to remove from this portion of the study, we
ran the data without outgroups. The resulting unrooted
phylograms allowed us to select taxa for removal that
had similar positions, and so there was no loss of relationships within or among genera. Taxa were selected so
as to keep the basic structure of the unrooted phylogram,
e.g., all potentially paraphyletic groups were maintained
and members of the core subtribes were arranged in the
same manner. Because all of the members of each genus
indicated to be paraphyletic were contained within a single subtribe, the fact that they are paraphyletic does not
affect the questions being asked in this study. After pruning the database there were 28 ingroup samples. The
analyses were then re-run using the pruned data set to
confirm to the overall branching structure. Figure 2
shows an unrooted phylogram with labels on the major
groups plus abbreviations that will be used in most figures; the remaining problem taxa and outgroups are not
included. The basic shape of Fig. 2 was taken from
Gaz
Gazania 62
Gazania 59
Gazania 64
Hirpicium 86
Gorteria 69
Gorteria 73
Didelta 51
Didelta 50
Did
Berkheya 24
Hirpicium 25
Hirpicium 87
Cuspidia 104
Berkheya 18
Berkheya 99
Cullumia 37
Cullumia 39
Berkheya 31
GORT
Ber
Heterorhachis 84
Fig. 2. An unrooted phylogram of Arctoteae showing the
location of the two main subtribes, Arctotinae (ARCT),
Gorteriinae (GORT), and the three clades of the latter:
Gazania-Gorteria-Hirpicium (Gaz), Berkheya-Cullumia
(Ber), and Didelta (Did). No outgroups or problem taxa
were included. The basic shape was taken from the
results of the combined analysis.
results of the combined analysis.
In all analyses conducted for this study, some of the
taxa in which we were interested are clearly placed (Fig.
2; no matter what outgroup is used to root this diagram it
always attaches somewhere along the long branch
between the two subtribes, thus allowing use of the
monophyletic subtribes in an unrooted diagram).
Heterorhachis was consistently part of the BerkheyaCullumia clade (Ber) of the subtribe Gorteriinae,
Haplocarpha was at the base of the subtribe Arctotineae
(ARCT), and Cymbonotus, the Australian genus, was
always part of Arctotineae. In addition, in the analyses
containing outgroups, Gundelia was always the sister
group of Lactuceae and was, therefore, maintained as
part of the outgroup for the rest of the study. The morphologically interesting taxa, Cuspidia and
Heterorhachis, are always found in the BerkheyaCullumia clade and Didelta is in the Didelta-Berkheya
clade; both clades are in the subtribe Gorteriinae.
Because they were stable in their placements, they are
considered part of one of the main subtribes and their
location is not discussed further. However, the positions
of the three other taxa of interest, the tribe
Eremothamneae (Eremothamnus and Hoplophyllum),
and the genera Heterolepis and Platycarpha, were not
clear nor was their relationship to the two core subtribes
or to the outgroups consistent. The position of these three
problem taxa was, therefore, a concern for the remainder
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Funk & al. • Evolution of the tribe Arctoteae
53 (3) • August 2004: 637–655
of the analysis.
trnL-F. — Data were available for all taxa except
Eremothamnus (Appendix), resulting in the use of 27
ingroup taxa and 16 outgroup taxa.
In an effort to determine the basic ingroup patterns,
the pruned dataset was analyzed without outgroups and
excluding the three remaining problem taxa
(Eremothamneae, Heterolepis, and Platycarpha). This
resulted in an analysis with 35 “parsimony informative”
characters (pi) which produced 72 trees (L = 84,
CI = 0.893, RI = 0.936). The three problem taxa were
then added to the same analysis and one of the unrooted
phylograms is shown in Fig. 3 (547 trees, L = 109,
pi = 38, CI = 0.881, RI = 0.914). All three problem taxa
were on long branches and very nearly in the same location. When one of the outgroups, the Liabeae-Vernonieae
clade (LIA-VER), was added to the analysis, it formed a
ARCT
1 change
Pla
Het
2
1
GUN-LAC
Ere
*
Did
GORT
Ber
Gaz
LIA-VER
LIAVER
Ber
Gaz
66
Het
100
Ere
ARCT
100
61
53
GUNLAC
57
59
Pla
75
GORT
Did
Fig. 3. Unrooted phylogram from trnL-F data analyzed
with problem taxa but without outgroups. The arrows
indicate placement of the two outgroup clades,
Gundelieae-Lactuceae
(GUN-LAC)
and
LiabeaeVernonieae (LIA-VER) when they are added to the analysis singularly. Note that the placement of Platycarpha
changes from position “1” when the outgroup is LIA-VER
to position “2” when the outgroup is GUN-LAC. The *
indicates a branch that collapsed in the unrooted strict
consensus tree (547 trees, L = 109, pi = 38, CI = 0.881,
RI = 0.914). The lower diagram is a bootstrap consensus
tree reduced to show the main groups.
644
polytomy with Eremothamneae, Platycarpha and
Heterolepis. When the other outgroup clade, the
Gundelieae-Lactuceae clade (GUN-LAC), was added it
also attached at the same node, however Platycarpha
changed its position and became the sister taxon of
Heterolepis. When any single problem taxon or outgroup
clade was added to the analysis, it attached at or near the
same location; when the taxa were combined, it resulted
in hundreds of trees with varying placement of the taxa
in question. The maximum likelihood tree for the trnL-F
data (score of single best tree found = 2612.57292) supported monophyly of the two main subtribes and of the
two outgroup clades, but the position of the two outgroup
clades and the problem taxa remained unresolved, and
Arctoteae were not indicated to be monophyletic. The
bootstrap consensus tree, shown in a reduced form at the
bottom of Fig. 3, is for an analysis with all problem taxa
and both outgroup clades. Note the weak support for the
placement of the problem taxa and outgroups.
ndhF. — There were no ndhF data for Heterorhachis and for one of the Gorteria species (Gorteria 69)
so they were not included in these analyses. There were
ndhF data available for Eremothamnus, so the taxon was
added for a total of 26 ingroup samples; all 10 outgroup
samples were included (Appendix).
When examined without outgroups or problem taxa,
the ndhF data set yielded 996 trees (pi = 42, L = 95,
CI = 0.821, RI = 0.906). It had the same basic structure
as the unrooted phylogram from the trnL-F sequence
data. When all three problem taxa were analyzed together (6029 trees, L = 122, pi = 47, CI = 0.803, RI = 0.879)
the resulting placement of the taxa put Platycarpha closer to Gorteriinae, Eremothamneae closer to Arctotineae
and Heterolepis between the two (Fig. 4). The two outgroup clades were added separately and their placement
is indicated by the arrows on Fig. 4. The LiabeaeVernonieae clade is placed closer to Platycarpha and
Gorteriinae, and the Gundelieae-Lactuceae clade is closer to Arctotineae; Heterolepis is between the two. The
maximum likelihood tree for ndhF (score of single best
tree found = 2447.8924) supported the monophyly of the
two main subtribes and of the two outgroup clades, but
the position of the outgroups and the problem taxa
remained unresolved. The Arctoteae could be monophyletic if they included Eremothamneae but not
Platycarpha or Heterolepis. The bootstrap consensus
tree, shown at the bottom of Fig. 4, is for an analysis with
all problem taxa and both outgroup clades; it shows weak
support for the placement of Eremothamneae, and it has
an unresolved cluster at the center of the diagram.
Combined chloroplast dataset. — Neither of
the chloroplast datasets had sufficient information to
fully resolve the trees. However, the two datasets can be
combined to produce a larger number of characters that
53 (3) • August 2004: 637–655
Funk & al. • Evolution of the tribe Arctoteae
ARCT
1 change
*
GUN-LAC
Ere
Het
LIA-VER
Pla
*
*
*
Did
Ber
Gaz
GORT
Ere
Ber
Gaz
100
Het
73
Pla
ARCT
100
64
60
GUNLAC
LIAVER
75
GORT
Eremothamneae was sister to Arctotineae. In either
explanation, the tribe Arctoteae could not be made monophyletic. However, when the data were analyzed with
outgroups but without the three problem taxa, the tribe
Arctoteae was monophyletic (36 trees, L = 379, pi = 128,
CI = 0.815, RI = 0.862). The bootstrap consensus diagram for the chloroplast data with all problem taxa and
the two outgroups is shown at the base of Fig. 5.
ITS. — Nuclear sequence data were gathered for all
ingroup taxa except Eremothamnus (28 taxa) and all 10
outgroup taxa. The initial analysis, without outgroups or
problem taxa, produced four trees (4 trees, L = 546, pi =
179, CI = 0.663, RI = 0.809), and in all four the three
problem taxa attach, when analyzed separately, between
the two subtribes as in the chloroplast sequences. Figure
7 illustrates one of the three unrooted phylograms produced when all three problem taxa are included without
the outgroup clades (3 trees, L = 729, pi = 196,
CI = 0.595, RI = 0.741). Note that while Platycarpha
remains between the two subtribes, Heterolepis and
Did
Fig. 4. The upper diagram is an unrooted phylogram from
ndhF data with problem taxa and without outgroups. The
arrows indicate placement of the outgroups when they
are added to the analysis singularly. The * indicates
branches that collapse in the unrooted strict consensus
tree (6029 trees, L = 122, pi = 47, CI = 0.803, RI = 0.879).
The lower diagram is a bootstrap consensus tree reduced
to show the main groups.
GUN-LAC
Ere
ARCT
Het
LIA-VER
Pla
Ber
Did GORT
Gaz
Pla
LIAVER
Ber
Gaz
100
Ere
83
ARCT
100
90
50
GORT
78
80
may shed light on the unresolved and conflicting areas of
the trees as well as the outgroup placement. As with both
trnL-F and ndhF data, all three problem taxa attached
between the two subtribes (Figs. 3, 4). When the outgroup taxa were added separately, the LiabeaeVernonieae clade connected at the base of the
Platycarpha and Heterolepis clade, and the GundelieaeLactuceae grouped with Eremothamneae becoming the
sistergroup of Arctotinae. Overall, the GundelieaeLactuceae clade was closer to Eremothamneae and
Arctotinae and Liabeae-Vernonieae to Heterolepis and
Gorteriinae. When both outgroup clades were added to
the analysis at the same time, two very different basal
topologies resulted depending on which outgroup was
used to root the tree (Figs. 5, 6; 108 trees, L = 429, pi =
135, CI = .804, RI = .844). When the tree was rooted on
Gundelieae-Lactuceae, the Liabeae-Vernonieae clade
was nested in the ingroup, sister to Gorteriinae along
with Heterolepis and Platycarpha (Fig. 5). When the
Liabeae-Vernonieae clade was used as the root,
Heterolepis formed a trichotomy at the base of the tree
and Gundelieae-Lactuceae was sister to the ArctotineaeEremothamneae clade (Fig. 6). In both figures,
Platycarpha was the sister group of Gorteriinae and
Het
GUNLAC
Did
Fig. 5. The upper diagram is a strict consensus tree from
the chloroplast data (trnL-F and ndhF) with both outgroup clades and all three problem taxa rooted on the
Gundelieae-Lactuceae clade (108 trees, L = 429, pi = 135,
CI = 0.804, RI = 0.844). The lower diagram is a bootstrap
consensus tree reduced to show the main groups.
645
Funk & al. • Evolution of the tribe Arctoteae
53 (3) • August 2004: 637–655
LIA-VER
Het
GUN-LAC
Ere
ARCT
Pla
Ber
Did
GORT
8009.8773) supported the monophyly of the two main
subtribes and of the two outgroup clades, but the position
of the outgroups remained problematic. Platycarpha is
sister to Liabeae-Vernonieae, and a weak clade of
Heterolepis and Hoplophyllum is sister to Gorteriinae.
Arctoteae are not monophyletic, with GundelieaeLactuceae closer to Arctotinae and Liabeae-Vernonieae
closer to Gorteriinae, depending on the rooting.
Combined data analysis of all sequences. —
All 28 ingroup taxa and 10 outgroup taxa were used for
the combined data analysis (trnL-F, ndhF, ITS). Figure 2
is an unrooted phylogram for the combined dataset
(without problem taxa and outgroups), and the two main
subtribes and the three clades within Gorteriinae are distinct. When the problem taxa were added (2 trees,
L = 976, pi = 281, CI = 0.644, RI = 0.767), they were
spread out along the branch that separates the two subtribes. The position of each outgroup clade was examined individually and the Liabeae-Vernonieae clade was
Gaz
ARCT
646
Pla
GUN-LAC
LIA-VER
Het
Gaz
Ere
Did
*
*
Ber
GORT
LIAVER
Ber
0
99
Gaz
100
94
Ere
Het
GUNLAC
GORT
100
Pla
ARCT
78
Eremothamneae are sister to one another and are nested
within Gorteriinae. The position of the outgroups (if
added separately) is indicated with arrows (Fig. 7). The
rooted trees that were run with both outgroups included
at the same time showed the outcome of rooting with one
outgroup or the other (Figs. 8, 9; 2 trees, L = 1443,
pi = 314, CI = 0.463, RI = 0.628). In Fig. 8, when the
tree was rooted with the Liabeae-Vernonieae clade,
Platycarpha was basal followed by monophyletic
Arctotineae, while the Gundelieae-Lactuceae clade was
between Arctotineae and Gorteriinae. When the same
unrooted phylogram was rooted on the GundelieaeLactuceae clade (Fig. 9), Platycarpha became sister to
Liabeae-Vernonieae and the two together were then sister to Arctotineae. The Gorteriinae clade (including the
Eremothamneae and Heterolepis) was the same with
either rooting of the tree. Note that in the analysis of the
nuclear DNA data, Platycarpha was most closely related
to either the Liabeae-Vernonieae clade or Arctotineae,
while in the chloroplast DNA it was closer to
Gorteriinae. The results of the bootstrap consensus
analysis involving all problem taxa and both outgroup
clades is shown at the base of Fig. 7; note the position of
the Gazania-Gorteria-Hirpicium clade in the unresolved
center of the diagram. The maximum likelihood tree for
the ITS data (score of single best tree found =
10 changes
10
Fig. 6. A strict consensus tree from the chloroplast data
(trnL-F and ndhF) with both outgroup clades and all three
problem taxa rooted on the Liabeae-Vernonieae clade.
[108 trees, L = 429, pi = 135, CI = 0.804, RI = 0.844]
Did
Fig. 7. The upper diagram is an unrooted phylogram from
ITS data with problem taxa but without outgroups. The
arrows indicate placement of the outgroups when they
are added to the analysis singularly. The * indicates branches that collapse in the strict consensus tree (3 trees,
L = 729, pi = 196, CI = 0.595, RI = 0.741). The lower diagram is a bootstrap consensus tree reduced to show the
main groups.
53 (3) • August 2004: 637–655
Funk & al. • Evolution of the tribe Arctoteae
LIA-VER
GUN-LAC
Pla
Pla
LIA-VER
ARCT
ARCT
GUN-LAC
Gaz
Gaz
Het
Ere
Het
Ere
Did
Did
Ber
Ber
10 changes
10 changes
Fig. 8. A phylogram from the ITS data with problem taxa
and outgroups, rooted with Liabeae-Vernonieae (LIAVER). The other outgroup (GUN-LAC) is sister to the subtribe Gorteriinae.
Fig. 9. A phylogram from ITS data with problem taxa and
outgroups, rooted with Gundelieae-Lactuceae. The other
outgroup (LIA-VER), along with Platycarpha, is sister to
the subtribe Arctotinae.
always the sister group of Platycarpha; however the
Gundelieae-Lactuceae clade attached in five different
places. When the two outgroups were analyzed together,
a four-branched polytomy resulted with the two outgroup
clades, the subtribe Arctotineae, and on a short branch
the remainder of the ingroup (Fig. 10; 8 trees, L = 1850,
pi = 441, CI = 0.530, RI = 0.665). The bootstrap consensus analysis of the same dataset produced the diagram
shown at the bottom of Fig. 10. This analysis was, as
usual, less resolved than the parsimony analysis so it
lacks the branch between the Ere-Het-GORT clade and
the rest of the taxa. Since the position of the LiabeaeVernonieae clade was unambiguous in the parsimony
analysis, one could argue that it would make a “better”
outgroup and root the tree using that clade. In such an
analysis, Arctoteae (including Heterolepis and Eremothamneae but excluding Platycarpha) are monophyletic.
Another alternative, and the one used here, was to gather sequence data from additional taxa that were outside
the subfamily Cichorioideae. Prior attempts to use these
taxa in this study had failed because with trnL-F and
ndhF data there were too few characters to resolve the
tree, and with the ITS some of the new outgroups were
so different that the results were ambiguous. However,
with the combined dataset there was a sufficiently large
number of “parsimony informative” characters, shorter
branches, and more reliable results making the inclusion
of these outside taxa possible. The additional outgroups
(Appendix 1) included two taxa from the subfamily
Barnadesioideae (Barnadesia and Dasyphyllum), the
basal branch in the family, along with two species of
African Mutisieae (Gerbera), and two species of
Cardueae (thistles; Carthamus and Cirsium). Data from
ndhF and trnL-F were collected for all six taxa and ITS
data from five (minus Dasyphyllum) for a total of 17
additional sequences. All of these taxa are located relatively close to the base of the family. The trnL-F and the
ndhF of these six additional taxa aligned relatively easily, but the ITS sequences were aligned with less confidence. Fortunately, the ambiguous areas were confined
to two places in the data matrix, and the data could be
analyzed with and without these two areas.
Figure 11 shows one of two trees produced by the
combined dataset (trnL-F, ndhF and ITS) of all taxa
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Funk & al. • Evolution of the tribe Arctoteae
53 (3) • August 2004: 637–655
Hesperomannia 1
LIA-VER
10 changes
Gymanthemum K11
Philoglossa 120
Munnozia K39
Cymbonotus 45
Oligactis 121
ARCT
Arctotis 14
Arctotis 08
Haplocarpha 77
Arctotheca 95
Dymondia 53
Ere
Pla
Didelta 51
Did
Didelta 50
Berkheya 24
*
*
Gundelia 96
Cichorium 136
Gaz
Het
GUN-LAC
Warionia
Berkheya 18
Cullumia 37
Berkheya 99
Cullumia 39
Heterorhachis 84
Berkheya 31
Ber
Cuspidia 104
Hirpicium 87
Hirpicium 25
Gorteria 73
Gazania 64
Gorteria 69
Gazania 62
Gazania 59 Hirpicium 86
GORT
Hypochaeris 33
Lactuca 133
Fig. 10. The upper diagram is an unrooted phylogram from the combined data set (trnL-F, ndhF, ITS), with problem taxa
and outgroup clades. The * indicates branches that collapse in the strict consensus tree (8 trees, L = 1850, pi = 441, CI
= 0.530, RI = 0.665). The lower diagram is a bootstrap consensus tree reduced to show the main groups.
including the second set of outgroups (L = 2345,
pi = 516, CI = 498, RI = 0.638). The two trees differed
only in a minor change in the position of one species of
Cullumia. The Gundelieae-Lactuceae clade is more distant from Arctoteae than the Liabeae-Vernonieae clade.
Platycarpha is basal to the Liabeae-Vernonieae clade and
cannot be considered part of Arctoteae. Within monophyletic Arctoteae there are several clades: the subtribe
Arctotineae, the genus Heterolepis, the tribe
Eremothamneae, and the subtribe Gorteriinae.
Furthermore, Gorteriinae can be broken up into three
clades: the Gazania-Gorteria-Hirpicium clade, the
Didelta-Berkheya clade and the Berkheya-Cullumia
clade. The same result was also obtained using just
Mutisieae and Cardueae as outgroups or Cardueae or
Mutisieae alone. The bootstrap values are listed on the
branches; note that although there is good support for
nearly all the branches (all but two critical nodes have
support of 72% or higher), the support for Arctoteae is
less than 50%. Likewise there is little support for the
grouping of Eremothamneae and Heterolepis or for these
two taxa grouping with the subtribe Gorteriinae. If the
648
data are analyzed without the three problem taxa, the
support for monophyly of Arctoteae is 72%.
The maximum likelihood tree of the ingroup rooted
on Platycarpha has monophyletic Arctotineae and
monophyletic Gorteriinae with Eremothamneae and
Heterolepis between the two subtribes (score
8781.5000). The maximum likelihood tree of the ingroup
with the Liabeae-Vernonieae clade as the outgroup gave
the same tree except that, because the tree was rooted
with the Liabeae-Vernonieae clade, Platycarpha was
basal to this clade; Fig. 11 (score 11513.36510).
Table 3 gives the size of the aligned matrices, the
number of gaps added in order to align the sequences, the
number of informative characters, and the percent of
sequence divergence (calculated using PAUP 4.0*) for
all three regions. When applicable, the figures were calculated for both the ingroup alone and for the ingroup
plus the outgroup. This table shows that the percent
sequence divergence is low in the cpDNA (2.9–4.5% for
trnL-F and 5.6–7.7% for ndhF) and higher in the ITS
sequences (19.9–28.3%). However, none of the divergence percentages were alarmingly high. Of more con-
53 (3) • August 2004: 637–655
Funk & al. • Evolution of the tribe Arctoteae
Dasyphyllum 465
BAR
Barnadesia K79
Gerbera 75
100
MUT
Gerbera 134
Carthamus 117
CAR
Cirsium 118
100
Gundelia 96
GUN
Warionia
100
Cichorium 136
93
100
Hypochaeris 33 LAC
87
Lactuca 133
Platycarpha 91
72
Gymanthemum K11
100
91
VER
Hesperomannia 1
92
Oligactis 121
100
Munnozia K39
LIA
86
Philoglossa 120
Haplocarpha 77
72
100
Dymondia 53
67
Cymbonotus 45
ARCT
Arctotheca 95
54
Arctotis 08
100
Arctotis 14
Heterolepis 82
96 Hoplophyllum 109
Eremothamnus GB
Hirpicium 87 Gaz
Gazania 64
100
99
56
Gazania 59
Gazania 62
99
Hirpicium 25
57
Hirpicium 86
ARC
95
90
93
Gorteria 69
Gorteria 73
Berkheya
24
100
Didelta 50
Did GORT
66
Didelta 51
Cuspidia 104
100
Berkheya 18
Berkheya 31
Heterorhachis 84
66
Berkheya 99
58
Cullumia 37
Ber
79
Cullumia
39
10 changes
Fig. 11. Phylogram with all taxa from the combined data set (trnL-F, ndhF, ITS). The tribe Arctoteae is monophyletic, the
subtribes Arctotineae and Gorteriinae are monophyletic; two problem taxa, the genus Heterolepis and the tribe
Eremothamneae, are weakly grouped together and are sister to Gorteriinae. The closest outgroup is the LiabeaeVernonieae clade and the problem genus Platycarpha. The bootstrap values are listed on the branches; note that
although there is good support for nearly all the branches, the support for Arctoteae is less than 50%.
cern is the number of informative characters, which
reaches 50% for ITS data in the combined analysis (with
all outgroups). The cpDNA scores reach as high as 8.6%
for the trnL-F and as high as 15% for the ndhF (combined analysis using all outgroups). The alignment problems in the ITS were confined to two areas, positions
39–165 (ITS 1) and positions 457–484 (ITS 2). As an
experiment, these two areas were replaced with question
marks for all of the outgroups and the three problem taxa.
All of the analyses were rerun, including the addition and
subtraction of all outgroups and problem taxa. The only
real difference between the final figure (combined analyses) for this altered dataset and Fig. 11 is a slight change
in the bootstrap values for some nodes and the fact that
649
Funk & al. • Evolution of the tribe Arctoteae
53 (3) • August 2004: 637–655
Table 3. Size of aligned matrices, number of gaps added, number of informative characters, and percent sequence
divergence for trnL-F, ndhF, and ITS. Figures usually given for both “only the ingroup” and for “ingroup plus all of the
outgroups”; single outliers have been removed.
Regions
trnL-F
ndhF
ITS
Total
Size of aligned
matrices
0897
0699
0679
2275
# of gaps added
(ingroup/outgroup)
47–49 /50–65
22–26/27–42
39–42/34–64
ca. 113/ ca. 141
Heterolepis moves to a position as the sister taxon to subtribe Arctotineae. Since the position of Heterolepis in
Fig. 11 or in the new analyses is not supported by either
high bootstrap values or the maximum likelihood analysis, this shifting of positions is not surprising.
DISCUSSION
Molecular data. — The final phylogeny (Fig. 11)
supports three out of four of the previously described
subtribes of Arctoteae: Arctotinae, Gorteriinae, and
Eremothamninae; the remaining subtribe, Gundeliinae,
was previously elevated to tribal level and is here confirmed as the sister group of Lactuceae. It is clear that
Haplocarpha and Cymbonotus belong in Arctotineae,
and Heterorhachis, Cuspidia, and Didelta in Gorteriinae.
However, to achieve monophyly in Arctoteae, Platycarpha must be removed from the tribe. Over the years
this genus has been in the tribes Mutisieae and Cardueae
as well as Arctoteae, and in the most recent classification
it was “unassigned to tribe” (Bremer, 1994). Of any
existing tribes it may be the closest to the LiabeaeVernonieae clade. However, final placement of this
genus must await the addition of several taxa which may
be near the base of the Liabeae-Vernonieae clade.
The phylogeny from the combined analysis (Fig. 11)
is a major step forward in understanding relationships
among taxa within Arctoteae, specifically the composition of the subtribes, and within subfamily Cichorioideae
s.s., particularly the sistergroup of Arctoteae, and placement of Eremothamneae. The extensive analyses have
also provided insights into affinities of taxa of Arctoteae
that are not expressed in the final figure. For instance,
when any of the three DNA regions were examined alone
or in combination, but without any of the problem taxa,
the results were similar: the two main subtribes were
monophyletic, the two outgroup clades were monophyletic, and either Arctoteae was monophyletic or the
relationship among the four clades (two outgroups and
two subtribes) was unresolved. The clades always have
the same composition, however, and there is little if any
conflict; it is just a problem of resolution. However,
when the problem taxa were added, changes occurred. In
650
# of informative characters
(ingroup/outgroup)
049/77
047/103
196/346
292/526
% sequence divergence
(ingroup/outgroup)
0.02965/0.04505
0.05578/0.07716
0.19897/0.28353
n/a
results of the analysis using chloroplast data,
Platycarpha was the sister group of Gorteriinae,
Eremothamneae was the sister group of Arctotinae and
Heterolepis was near the Liabeae-Vernonieae clade, but
its exact position was unresolved (Figs. 5, 6). In ITS
results, Platycarpha was closer to the LiabeaeVernonieae clade, which in turn was closer to Arctotineae
while Heterolepis and Eremothamneae were inside
Gorteriinae (Figs. 8, 9). This presents a nearly complete
reversal of their previous positions. The combined analysis produced results that were somewhere in the middle,
with Platycarpha sister to Liabeae-Vernonieae (as in the
ITS tree), Arctoteae and its two main subtribes
(Arctotinae and Gorteriinae) monophyletic; Heterolepis
and Eremothamneae were between the two subtribes and
the sister group of Gorteriinae. It is not unusual for there
to be some discordance of chloroplast and nuclear DNA
(e.g., Yoo & al., 2002), and it is usually attributed to the
possibility of hybridization. Following that reasoning,
the problem taxa could have such a history. Chromosome
numbers might be useful in searching for hybrids but
they are not available for most taxa in this analysis. For
seed plants it has been shown that inadequate taxon sampling can be responsible for conflicting results (Rydin &
Källersjö, 2002), but that is most likely not the problem
with this study because the taxa removed from the analysis were very similar in their molecular characters to
ones that were retained in the study. For now it seems
best to keep Heterolepis and Eremothamneae in
Arctoteae but out of either of the main subtribes.
Taxa within each of the two subtribes are closely
related, as evidenced by the short branch lengths that are
usually found within them. However, the problem taxa
and outgroups have much longer branches and a few of
the branches have weak or no support from bootstrap
analysis (Fig. 11). It is possible that there has been a relatively recent radiation within the two subtribes and that
the outgroups and problem taxa represent old lineages
that have been separated for a long time.
Morphology. — Based on the literature (Cassini,
1816, 1828; Robinson & Brettell, 1973a; Norlindh,
1977; Robinson, 1992, 1994; Bremer, 1994; Herman &
al., 2000) and personal observation, the morphology can
be examined in light of the phylogeny (Fig. 11).
53 (3) • August 2004: 637–655
Funk & al. • Evolution of the tribe Arctoteae
Fig. 12. Photographs of several heads and habits of Arctoteae. A, Didelta; B, Arctotis; C, Cullumia; D, Hirpicium; E,
Gazania; F, Berkheya; G, Didelta; H, Arctotis; I, Gorteria; J, Berkheya. All photos by V. Funk.
Photographs of several members of the tribe are found in
Figs. 1 and 12.
The members of the subtribe Arctotinae (Arctotis,
Arctotheca, Cymbonotus, Dymondia and Haplocarpha;
Figs. 1B, C, 12B, H) can be characterized as follows:
they do not produce latex; their involucral bracts are not
fused (one species of Arctotheca and two of
Haplocarpha have a tendency toward fusion), the outermost bracts are foliaceous and have a scarious apical
lamina and the receptacle is smooth or shallowly areolate-alveolate; the ligulate florets have 4 veins and 3lobes when lobes are present (similar to the tribe Liabeae
and the subfamily Asteroideae), and they are fertile
(except for Arctotheca); the central florets have shallow651
Funk & al. • Evolution of the tribe Arctoteae
ly lobed corollas, the anthers are not tailed (except for
Arctotis the largest genus of the subtribe), and the style
has a swollen portion below the branch point sometimes
with a ring of hairs; the achenes have 3–5 dorsal, welldeveloped ribs or wings. Many of the members of this
subtribe are rosette-forming, perennial herbs (Fig. 12H).
Most of these characters would be considered plesiomorphic except for the swollen portion of the style with the
ring of sweeping hairs (also found in some thistles) and
the 3–5 well-developed ribs or wings on the achenes. The
lack of latex is most likely apomorphic, but it comes and
goes so often in the subfamily that it is difficult to use at
this level.
The members of the subtribe Gorteriinae (Berkheya,
Cullumia, Cuspidia, Didelta, Gazania, Gorteria,
Heterorhachis, and Hirpicium; Figs. 1A, D, E, 12A,
C–G, I, J) are better defined as follows: they have laticifers (the cells that normally contain latex), and latex is
present in Gazania, some Berkheya and possibly others;
involucral bracts are connate at least at the base (Fig.
12E), or in various degrees upwards, forming a cup;
receptacles are more or less deeply alveolate and enclosing at least the base of the achenes, the apex of the ray
florets often have 5 veins and 4 lobes when lobes are
present, but it can vary from 2–5 lobes in some taxa; the
rays are sterile, the central florets are deeply lobed (Figs.
1A and D), the anthers are sagittate but not tailed, and the
previously mentioned conspicuous swollen portion of
styles is either not present or not well-developed; the
achenes are without well-developed ribs or wings. Figure
11 shows the three clades of this subtribe: the GazaniaHirpicium-Gorteria clade comprises annual or perennial
herbs with strongly fused involucral bracts (Fig. 12E),
the Berkheya-Cullumia clade comprises a mixture of
subshrubs, shrubs, and annual and perennial herbs that
are usually spiny in some manner (Figs. 1D, 12C, F, J),
and the Didelta-Berkheya clade consists of subshrubs or
shrubs with the Didelta members having heads that break
apart (Figs. 1A, 12A, G). Members of both the BerkheyaCullumia and the Didelta-Berkheya clades have partially
fused involucral bracts. The apomorphic characters for
this subtribe include the connate involucres, deeply
alveolate receptacles, and 4-lobed and 5-veined sterile
rays.
All three problem taxa have sets of characters that
make it difficult to place them in either of the subtribes.
The genus Platycarpha (three species) is a perennial herb
confined to southern Africa. The heads are discoid and
have only a few florets, which are purple, and these small
heads are aggregated into a secondary head that is large
and sessile, lying mostly flat on the ground with the
leaves spread out like the spokes of a wheel. The plant is
either acaulescent, without branches, or with subterranean branches. The receptacle has pales (bracts), the
652
53 (3) • August 2004: 637–655
anthers either have tails (or are sagittate), and the style
has a swelling and a ring of sweeping hairs. The achenes
are only faintly ribbed and the pappus is made up of
scales. While Platycarpha has the swollen style and the
ring of sweeping hairs of Arctotineae (and some
Cardueae), it does not have the other potential apomorphies of either subtribe, and it has purple flowers and
pales which they do not.
Heterolepis (three species) is found only in the
Western Cape of South Africa. It is a small shrub with
involucral bracts somewhat connate in 1–3 rows with the
outer ones sometimes herbaceous and the inner with
membraneous margins. They have tailed anthers and the
heads have fertile rays each with 3 lobes and 4 veins. The
styles are slender with short branches, the apical portion
either is not or is only slightly thickened, and it has a ring
of sweeping hairs. There are no ribs on the achenes and
the pappus is made up of slender “bristle-like” scales.
Heterolepis has somewhat connate involucral bracts but
none of the other apomorphies of Gorteriinae. The margins of its involucral bracts and style are somewhat similar to Arctotineae.
The tribe Eremothamneae (Eremothamnus, one
species from Namibia; Hoplophyllum, two species from
Northwest Cape Province, South Africa) contains shrubs
that are radiate or discoid (respectively). When present,
the rays are female and fertile with three apical lobes.
The anthers have short tails and the styles are long and
slender (similar to Vernonieae and some Liabeae), they
have unusual bi- and tri-cellular sweeping hairs but not
the ring of sweeping hairs found in Arctotinae. There are
no distinct ribs on the achenes, and the pappus is capillary. It has none of the apomorphies of either subtribe
although its members have spines or thorns on the leaves
as do many members of Gorteriinae.
It is heartening that all three of the problem taxa
(based on molecular data) have morphological characters
that have traditionally made it difficult to place them in
either of the two main subtribes of Arctoteae. Platycarpha has a swollen area on the shaft of the style, but it
also has discoid heads with purple florets, a paleaceous
receptacle, and tailed anthers, characters that are unlike
either of the subtribes. Heterolepis has tailed anthers,
unlike the two subtribes, connate involucral bracts as in
Gorteriinae but without the deeply alveolate receptacle,
the common type of ray floret as in Arctotinae, and an
unusual pappus. Finally, members of Eremothamneae
have unique hairs on long, slender styles, and, unlike
members of the two subtribes, they have a capillary pappus and tailed anthers, and Hoplophyllum has a discoid
head. None of them have the connate involucral bracts
with the deeply alveolate receptacle and the 4-lobed sterile rays of Gorteriinae, nor do they have the prominently
winged or ribbed achenes. Platycarpha and
53 (3) • August 2004: 637–655
Eremothamneae do not have the scarious-margined
bracts of Arctotinae.
Given the morphological and molecular data, it
seems that we can be certain that the two main subtribes,
Arctotinae and Gorteriinae, are monophyletic (as we
have defined them) with robust support. The three problem taxa do not belong in either of these two subtribes
nor are they closely related to one another. Our data indicate that Eremothamneae and possibly Heterolepis most
likely belong in Arctoteae but that Platycarpha does not.
Of course, with the inclusion of both Heterolepis and the
tribe Eremothamneae (as a subtribe it would be
Eremothamninae) the few morphological characters that
existed for the tribe Arctoteae have been lost; the scaly
pappus, lack of tailed anthers, usually radiate heads, and
typical styles are not found in one or both of these
groups. A separate morphological analysis is underway
(Karis & Funk, pers. comm.) that will hopefully shed
light on this problem. The weak support for the tribe is
supported by repeated bootstrap analyses, with and without problem taxa, which have failed to find strong support for monophyletic Arctoteae. For now, our conclusion must be that there are little data (either from molecules or morphology) to support the monophyly of
Arctoteae, and molecular work currently underway in
both Lactuceae and Vernonieae may help in making this
determination.
There are several important lessons learned in this
study. First, the problem taxa are of critical importance.
It is clear that in the subfamily Cichorioideae s.s. unusual and morphologically hard to place taxa must be
included in any molecular analysis. For instance, in Fig.
2 (all problem taxa and all outgroups removed), the
resulting tree shows that the two subtribes could easily
be monophyletic, and if only one of the two outgroup
clades were used it would present a perfect picture of a
monophyletic Arctoteae. If any of the problem taxa
(Heterolepis, Eremothamneae, or Platycarpha) or any of
the outgroups are added, they attach between the two
subtribes, and when used one at a time or in certain combinations of two, they produce a clear result.
Combinations of two or more problem taxa in conjunction with both main outgroups generates problems with
monophyly of the tribe. All previous studies involving a
few taxa from the core subtribes did not reveal the problems in the tribe. Second, multiple outgroups must be
evaluated in an exhaustive process to determine how the
outgroups are behaving and what effect they are having
on the ingroup. This is probably one of the most underrated steps in cladistic analyses, and it has great impact
on the outcome. One or two token representatives will
not suffice unless a thorough analysis has been done previous to the study in question. Finally, unrooted phylograms and unrooted strict consensus trees give very use-
Funk & al. • Evolution of the tribe Arctoteae
ful results for analyzing data by freeing the investigator
from preconceived notions about relationship.
ACKNOWLEDGEMENTS
We thank the many colleagues who have sent us material and
provided assistance in the field, particularly Marinda Koekemoer
(PRE) and Terry Trinder-Smith (BOL), and the various herbaria
who have either provided material or loaned specimens (F, K, MO,
NY, PRE, US). We also thank MJ Research, especially Mark
Norman and Jonathan Schimmel, for allowing us to use their facilities, Jose Panero for sending two unpublished sequences, and K.
Peyton, K. Redden, and C. Kelloff for technical assistance. We
send a big thank you to Tom Hollowell for his help with the graphics. We especially appreciate the funding that was provided by the
National Science Foundation (DEB-0075095 to SK), the office of
the Dean of the College of Natural Sciences, University of Hawaii
(to SK), and the Mellon Foundation and Scholarly Studies programs of the Smithsonian Institution’s Office of Fellowships and
Grants (to VAF). We appreciate the help of Linda Watson who
gave us advice on the analysis and Per Ola Karis and an anonymous reviewer who provided comments on the manuscript and, of
course, the editors for their helpful suggestions.
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Appendix. Sources of sequence data and GenBank numbers.
Barnadesia K79
Carthamus 117
Cirsium 118
Dasyphyllum 465
Gerbera 75
Gerbera 134
Genus
Species
Authority
Collector & No.
Locality
Herb.
ITS
trnL
ndhF
Arctoteae
Arctotheca
Arctoteae
Arctotis
Arctoteae
Arctotis
Arctoteae
Berkheya
Arctoteae
Berkheya
Arctoteae
Berkheya
Arctoteae
Berkheya
Arctoteae
Cullumia
Arctoteae
Cullumia
Arctoteae
Cuspidia
Arctoteae
Cymbonotus
Arctoteae
Didelta
Arctoteae
Didelta
Arctoteae
Dymondia
Eremothamneae Eremothamnus
Arctoteae
Gazania
Arctoteae
Gazania
Arctoteae
Gazania
Arctoteae
Gorteria
Arctoteae
Gorteria
Arctoteae
Haplocarpha
Arctoteae
Heterolepis
Arctoteae
Heterorhachis
Arctoteae
Hirpicium
Arctoteae
Hirpicium
Arctoteae
Hirpicium
Eremothamneae Hoplophyllum
Arctoteae
Platycarpha
calendula
bellidifolia
fastuosa
carlinopsis
cruciata
cuneata
spinosissima
bisulca
rigida
cernua
lawsonianus
carnosa
spinosa
margaretae
marlothianus
sp.
krebsiana
tenuifolia
diffusa
personata
scaposa
aliena
aculeata
echinus
gazanioides
integrifolium
spinosum
carlinoides
(L.) Levyns
Berg.
Jacq.
Welw. ex O. Hoffm.
Willd.
Willd.
Willd.
(Thunb.) Less.
DC.
(L.f.) B.L. Burtt
Gaudich.
Ait.
(L.f.) Ait.
Compton
O.Hoffm.
Funk 12266
Koekemoer & Funk 1926
Trinder-Smith 238
Bourell et al. 2689
Koekemoer 2002
Funk 12275
Koekemoer & Funk 1962
Koekemoer & Funk 1935
Trinder-Smith 182
Koekemoer 1986
Holland & Fechner 1336
Koekemoer & Funk 1943
Trinder-Smith 142
Trinder-Smith 197
South Africa
South Africa
South Africa
South Africa
South Africa
South Africa
South Africa
South Africa
South Africa
South Africa
Australia
South Africa
South Africa
South Africa
Namibia
South Africa
South Africa
South Africa
South Africa
South Africa
South Africa
South Africa
South Africa
South Africa
Namibia
South Africa
South Africa
South Africa
US
PRE
US
MO
PRE
PRE
PRE
PRE
US
PRE
US
PRE
US
US
PRE
PRE
US
US
US
US
US
PRE
PRE
MO
PRE
PRE
PRE
AY504703
AY504704
AY504705
AY504709
AY504712
AY504711
AY504710
AY504713
AY504714
AY504715
AY504706
AY504716
AY504717
AY504707
AY504718
AY504719
AY504720
AY504722
AY504721
AY504708
AY504700
AY504723
AY504724
AY504726
AY504725
AY190607
AY504701
AY504785
AY504786
AY504787
AY504791
AY504794
AY504793
AY504792
AY504795
AY504796
AY504797
AY504788
AY504798
AY504799
AY504789
AY504800
AY504801
AY504802
AY504804
AY504803
AY504790
AY504782
AY504805
AY504806
AY504808
AY504807
AY504784
AY504783
AY504745
AY504746
AY504747
AY504751
AY504754
AY504753
AY504752
AY504755
AY504756
AY504757
AY504748
AY504758
AY504759
AY504749
L39424
AY504760
AY504761
AY504762
AY504763
AY504750
AY504742
AY504764
AY504766
AY504765
AY504744
AY504743
Lactuceae
Gundelieae
Vernonieae
Vernonieae
Lactuceae
Lactuceae
Liabeae
Liabeae
Liabeae
Gundelieae
Cichorium
Gundelia
Gymnanthemum
Hesperomannia
Hypochaeris
Lactuca
Munnozia
Oligactis
Philoglossa
Warionia
intybus
tournefortii
amygdalina
arborescens
glabra
sativa
gigantea
volubilis
mimuloides
saharae
L.
Kelloff & Funk 1415
L.
al-Hosseini s.n.
Delile
Kew 318-86-02802 s.n.
A. Gray
Ching A20
L.
Funk 12217
L.
Funk s.n.
(Rusby) Rusby
Dillon s.n.
(Kunth) Cass.
Funk 12042
(Hieron.) H.Rob. & Cuatr. Funk 11453
Benth. & Cross
Lippert 25346
USA
Iran
Africa (cultivated)
Hawaii (cultivated)
Australia
cultivated
Peru
Colombia
Ecuador
Morocco
US
US
K
PTBG
US
none
F
US
US
US
AY504694
AY504691
AY504695
AY504696
AY504692
AY504693
AY504697
AY504698
AY504699
AY190608
AY504736
AY504733
AY504737
AY504738
AY504734
AY504735
AY504739
AY504740
AY504741
AY702088
Barnadesieae
Cardueae
Cardueae
Barnadesieae
Mutisieae
Mutisieae
Barnadesia
Carthamus
Cirsium
Dasyphyllum
Gerbera
Gerbera
caryophylla
oxycantha
drummundii
reticulatum
crocea
sp.
S.F. Blake
Bieb.
Torr. & Gray
(DC.) Cabrera
Kuntze
Peru (cultivated)
Iran
U.S.A.
Brazil
South Africa
Africa (cultivated)
MICH
US
US
US
PRE
none
AY504686
AY504689
AY504690
AY504687
AY504688
AY504776
AY504773
AY504777
AY504778
AY504774
AY504775
AY504779
AY504780
AY504781
AY702089/
AY702090
AY504768
AY504771
AY504772
AY504767
AY504769
AY504770
Less.
Less.
Thunb.
L.
Harv.
(L.f.) Druce
(Burm.f.) Roessler
Less.
(Harv.) Roessler
Less.
DC.
Oliver & Hiern.
Koekemoer & Funk 1929
Koekemoer & Funk 1969
Trinder-Smith 64
Trinder-Smith 103
Dodd 289
Trinder-Smith 191
Trinder-Smith 188
Oliver 3867
Koekemoer & Funk 1966
Long & Rae 734
Koekemoer & Funk 1956
Koekemoer 2045
Germishuizen 2613
Matthei Bot. Gard s.n.
al-Hosseini s.n.
Funk 12302
Roque, Funk & Kim 485
Koekemoer & Funk 1924
Funk s.n.
AY504728
AY504731
AY504732
AY504727
AY504729
AY504730
Funk & al. • Evolution of the tribe Arctoteae
Tribe
53 (3) • August 2004: 637–655
655
Label
Ingroup
Arctotheca 95
Arctotis 08
Arctotis 14
Berkheya 18
Berkheya 99
Berkheya 31
Berkheya 24
Cullumia 37
Cullumia 39
Cuspidia 104
Cymbonotus l45
Didelta 50
Didelta 51
Dymondia 53
Eremothamnus GB
Gazania 59
Gazania 62
Gazania 64
Gorteria 73
Gorteria 69
Haplocarpha 77
Heterolepis 82
Heterorhachis 84
Hirpicium 25
Hirpicium 87
Hirpicium 86
Hoplophyllum 109
Platycarpha 91
Outgroup
Cichorium 36
Gundelia 96
Gymanthemum K11
Hesperomannia 1
Hypochaeris 33
Lactuca 133
Munnozia K39
Oligactis 121
Philoglossa 120
Warionia s.n.