Comparative Morphology of the Genus Tamarix (Tamaricaceae) in Iran

Reza Arianmanesh; Iraj Mehregan; Mostafa Assadi; Taher Nejadsattari

doi:10.56431/p-6s8gxp

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Comparative Morphology of the Genus Tamarix (Tamaricaceae) in Iran
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HomeInternational Letters of Natural SciencesInternational Letters of Natural Sciences Vol. 60Comparative Morphology of the Genus Tamarix...

Comparative Morphology of the Genus Tamarix (Tamaricaceae) in Iran

Abstract:

Tamarix L. with almost 54 species is the largest genus of the Tamaricaceae. This study was carried out on species of Tamarix that growing in Iran. Morphological characters were obtained for 23 species recognized by recent taxonomic treatments from Iran. In this study we use 10 characters to identify species of Tamarix that growing in Iran. For SEM studies, we used dry sampels of leaves and flowers. Some characters are useful for segregating certain species, such as gross leaf morphology (vaginate vs. sessile), number of floral parts, certain aspects of androecial disk morphology, petal shape, presence or absence of hairs on the raceme rachis, and whether the filament is inserted under or from the side of the androecial disk. In some species the number of sepals, petals and stamens are constant and reliable. One of the problems in Tamarix is that in many species the number of certain floral organs is inconstant thus the number of floral parts alone can not serve as a diagnostic marker without being correlated with the relative position of the organs and their range of numerical variability.

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Periodical:

International Letters of Natural Sciences (Volume 60)

Pages:

1-12

DOI:

https://doi.org/10.56431/p-6s8gxp

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Online since:

November 2016

Authors:

Reza Arianmanesh, Iraj Mehregan, Mostafa Assadi, Taher Nejadsattari

Keywords:

Iran, Morphology, SEM, Tamarix

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Creative Commons CC BY 4.0

References

[1] A trend towards the formation of smaller flowers and narrower racemes (all species of section Tamarix).

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[2] A transition from diplostemony to haplostemony leads gradually to complete abortion of the antepetalous stamens.

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[3] Fusion or adnation of the antepetalous whorl of stamens to the antesepalous one.

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[4] Persistence of the corolla is no doubt secondary to caducity. This characteristic is limited to the majority of the hypodiscal species and is surprisingly only found in the glyciphilous species.

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[5] Glycophily is no doubt a less advanced characteristic than halophily. Most of the hypodiscal species are glycophytes, while the bulk of the species are halophytes. This is in agreement with the view that non-salt-tolerant species are less specialized than salt-tolerant ones. These five closely-linked evolutionary processes are conventionally accepted by taxonomists and are very helpful in discussing the relationships between the species. Table 2. Morphological characters of the Iranian species of Tamarix. Bract length relative to pedicel length Petals shape Petals length Sepals shape Sepals length Racemes width Racemes length Androecial disk morphology Number of floral parts Leaf morphology Section Name of the taxa Longer Obtriangular-obovate 2 mm Ovate 1 mm 7-8 mm 3-8 cm Hololophic Pentamerous Vaginate TAMARIX T. dioica Equalling or shorter Elliptic 2 mm Ovate 1-1.2 mm 6 mm 1-6 cm Synlophic Pentamerous Vaginate TAMARIX T. kermanensis Shorter Obovate-elliptic 2-2.25 mm Ovate 1.75 mm 4-5 mm 2-6 cm Paralophic Pentamerous Vaginate POLYADENIA T. stricta Longer Elliptic to obovate- 2-2.25 mm Ovate to elliptic 1.5 mm 4-5 mm 3-6 cm Hololophic Pentamerous Vaginate TAMARIX T. aphylla Longer Obovate-elliptic 1-1.75 mm Trullate-ovate 0.5-1 mm 3-4 mm 1.5-7 cm Hololophic Pentamerous Sessile with narrow base TAMARIX T. ramosissima Shorter Ovate to ovate-elliptic 2-3.5 mm Trullate-ovate 1-2 mm 6-12 mm 5-12 cm Hololophic Pentamerous Sessile with narrow base OLIGADENIA T.rosea Equalling or scarcely longer Obovate 1-1.5 mm Trullate-ovate 0.5-0.75 mm 3-4 mm 1.5-5 cm Hololophic Pentamerous Sessile with narrow base TAMARIX T. arceuthoides Longer Elliptic to obovate 1.5-2 mm Ovate or trullate-ovate 0.75-1 mm 3-5 mm 4-15 cm Hololophic Pentamerous Sessile with narrow base TAMARIX T. indica Longer Obovate-elliptic 1.5-1.75 mm Ovate 0.75-1.25 mm 3-4 mm 2-15 cm Hololophic Pentamerous Sessile with narrow base TAMARIX T. korolkowii Equalling or longer Obovate-elliptic 1.25-1.5 mm Trullate-ovate 0.5-0.75 mm 3-4 mm 0.5-4 cm Hololophic Pentamerous Sessile with narrow base TAMARIX T. karakalensis Longer Obovate-elliptic 1.75-2 mm Trullate-ovate 0.75-1 mm 3.5-5 mm 2-6 cm Hololophic Pentamerous Sessile with narrow base TAMARIX T. aralensis Longer Ovate 2-2.75 mm Trullate-ovate 1 mm 4 mm 0.5-2.5 cm Hololophic Pentamerous Sessile with narrow base TAMARIX T. smyrnensis Longer Ovate-elliptic 1.25-1.75 mm Ovate 0.75-1 mm 3-4 mm 1.5-3 cm Synlophic Pentamerous Amplexicaul TAMARIX T. mascatensis Longer Obovate 1.8 mm Ovate 0.8 mm 2.5-3 mm 1-2 cm Synlophic Pentamerous Amplexicaul TAMARIX T. serotina Longer Obovate-elliptic 1.5-2 mm Ovate 0.75-1 mm 3-5 mm 1.5-15 cm Synlophic Pentamerous Sessile with narrow base TAMARIX T. hispida Longer Elliptic 3-3.5 mm Ovate 1.5-1.75 mm 7-9 mm 2-4 cm Paralophic Pentamerous Sessile with narrow base POLYADENIA T. dubia Longer Elliptic to obovate 2-2.25 mm Trullate-ovate 0.75-1 mm 3-4 mm 1-3 cm Synlo to Para-Synlophic Tetra-Pentamerous Amplexicaul OLIGADENIA T. kotschyi Equalling or shorter Elliptic-ovate to obovate 2-2.25 mm Trullate-ovate 1 mm 3-5 mm 1.5-4 cm Synlo to Para-Synlophic Tetra-Pentamerous Sessile with narrow base OLIGADENIA T. androssowii Longer Obovate to ovate 3.5-5 mm Trullate-ovate 2 mm 8-10 mm 5-15 cm Paralophic Tetra-Pentamerous Sessile with narrow base OLIGADENIA T. tetragyna Equalling Elliptic-ovate to obovate 4-6 mm Trullate-ovate 2-3.5 mm 8-12 mm 4-9 cm Paralophic Tetramerous Sessile with narrow base OLIGADENIA T. octandra shorter Elliptic to ovate 3.5-4 cm Trullate-ovate 2.5-2.75 mm 8-10 mm 2-5 cm Disc without lobes Pentamerous Sessile with auriculate base POLYADENIA T. passerinoides Equalling or longer Obovate 1.3-1.7 mm Ovate to elliptic 0.7-0.9 mm 3-4.5 0.5-3 cm Synlo to Hololophic Pentamerous Amplexicaul OLIGADENIA T. leptopetala Equalling or longer Elliptic-ovate to obovate 2.25-2.5 mm Trullate-ovate 1-1.25 mm 6 mm 2-4 cm Synlophic Tetramerous Sessile with narrow base OLIGADENIA T. szowitsiana Fig. 1. SEM photograph of leaf forms of some members of the genus Tamarix. A: T. passerinoides var. passerinoides. B: T. hispida var. karelinii. C: T. szowitsiana. D: T. karakalensis. E: T. ramosissima. F: T. tetragyna var. meyeri. G: T. aralensis. H: T. kotschyi. I: T. androssowii. J: T. mascatensis. K: T. leptopetala. L: T. dioica. M: T. stricta. N: T. aphylla. O: T. tetragyna var. deserti. Fig. 2. SEM photograph of disk morphology of some members of the genus Tamarix. A: T. passerinoides var. passerinoides. B: T. passerinoides var. macrocarpa. C: T. hispida var. karelinii. D: T. karakalensis. E: T. tetragyna var. meyeri. F: T. aralensis. G: T. tetragyna var. deserti. H: T. androssowii. I: T. mascatensis. J: T. leptopetala. K: T. szowitsiana. L: T. ramosissima.

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