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ISSN 1179-3155 (print edition) Phytotaxa 217 (2): 173–181 www.mapress.com/phytotaxa/ Copyright © 2015 Magnolia Press Article PHYTOTAXA ISSN 1179-3163 (online edition) http://dx.doi.org/10.11646/phytotaxa.217.2.7 Taxonomic notes on the Cephalaria sect. Atrocephalae (Caprifoliaceae) from Iran MASSOUD RANJBAR* & ZAHRA RANJBAR Department of Biology, Herbarium division, Bu-Ali Sina University, P.O. Box 65175/4161, Hamedan, Iran. *Corresponding author: ranjbar@basu.ac.ir Abstract Cephalaria bojnordensis (Caprifoliaceae) is described and illustrated as a new species from Khorasan Province, north-east Iran. The characters that distinguish this new species from C. microcephala and C. isurica are provided along with a key to the Iranian species in Cephalaria sect. Atrocephalae. In addition, a lectotype is designated for C. microcephala. Key words: Cephalaria, Khorasan, new species, taxonomy Introduction The genus Cephalaria Schrader ex Roemer & Schultes (1818: 43) belongs to the family Caprifoliaceae (Dipsacales) and consists of about 100 species (Reveal & Chase 2011, Mayer & Ehrendorfer 2013). The members are herbaceous (rarely shrubby) hemicryptophytes with ovoid or globose capitula, coriaceous involucral and receptacular bracts in several rows, receptacular bracts larger than the involucral bracts, cupuliform calyx, 4-lobed corolla and the common chromosome base number of x = 9 (Verlaque 1980, Mayer & Ehrendorfer 2013). The main centers of distribution of Cephalaria are in Europe, eastern Mediterranean, north and central Africa, east Asia, Iran and the Middle East (Szabó 1940). Candolle (1830: 647) separated Cephalaria species into three groups based on the following characters: (1) perennials, with acuminate and pubescent receptacular bracts; (2) annuals, with membranous and apiculate to aristate at apex receptacular bracts; and (3) perennials, with only external obtuse receptacular bracts. Boissier (1875: 117) divided Cephalaria into two sections: (1) Phalacarpus, with the involucel bald at apex, (2) Lepicephalus, with the involucel having teeth or being 4–8 aristate. Szabó (1940: 115) placed the 53 species of Cephalaria into four subgenera: (1) Lobatocarpus, (2) Fimbriatocarpus, (3) Phalacrocarpus, and (4) Cephalaria (formerly called “Denticarpus” Szabó). The number of epicalyx grooves and differences in the reduced corona were the characters used for distinguishing these subgenera. Cephalaria subg. Cephalaria has an epicalyx ending in short or long awns, is the largest subgenus with 43 species and is divided into seven sections, five of which are for the perennial species and two for the annuals (Szabó 1940, Carlson et al. 2009). In the Flora Iranica (Lack 1991), there are seven species of Cephalaria listed, three of which belong to section Atrocephalae. Since then five species have been newly recorded for Iran (Jamzad 1993). These include C. transsylvanica (L.) Schrad, Cat., C. uralensis (Murr.) Schrad., C. hirsuta Stapf., C. tchihatchewii Boiss., C. kotschyi Boiss & Hohen. The three latter species are placed in C. section Atrocephalae. Material and methods The present study is based on herbarium material of Cephalaria deposited at BASU, BM, E, FUMH, G, JE, K, W and WAG and our own collections and field observations made around Reen, near Bojnord in Khorasan Province, northeast Iran. The collected specimens were identified using the Flora Iranica (Lack 1991), the Flora USSR (Bobrov 1957) and the Flora of Turkey (Matthews 1972). One species was found to be new to science. Accepted by Marco Duretto: 26 May 2015; published: 23 Jun. 2015 173