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The systematic value of pollen morphology in Smilacaceae

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Abstract

Smilacaceae are a small family of dioecious, mostly climbing, net-veined monocotyledons with a cosmopolitan distribution. Relatively little is known about the variation of pollen morphology within the family. For this reason, and to investigate the systematic value of palynology in Smilacaceae, pollen from 125 species of Smilax, Heterosmilax, and Ripogonum was examined using light and scanning electron microscopy. Ten of these were examined further by transmission electron microscopy. Four distinct pollen types grouped into two major pollen classes were distinguished: Class 1, represented by the pollen of all Smilax and Heterosmilax species, is mostly spheroidal, inaperturate, and spinulate or microspinulate, with a thin, fragile exine of varied sculpturing; three pollen types are represented within this class. Class 2 is found only in Ripogonum and contains a single pollen type with prolate, monosulcate, reticulately-sculptured pollen. The unique pollen morphology of Ripogonum supports its removal from Smilacaceae. In contrast, the characteristics of Heterosmilax pollen intergrade with those seen in Smilax, suggesting that the former might be better reduced to synonymy with the latter. A key to the identification of these pollen types is presented along with a discussion of geographic and possible evolutionary trends among them.

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Authors and Affiliations

  1. Laboratory of Systematic and Evolutionary Botany & Biodiversity, College of Life Sciences, Zhejiang University, Hangzhou, 310029, P. R. China

    S.-C. Chen, S.-F. Ni & C.-X. Fu

  2. College of Life Sciences, Anhui Normal University, Wuhu, 241000, P. R. China

    X.-P. Zhang

  3. The Lewis B. and Dorothy Cullman Program for Molecular Systematics Studies, The New York Botanical Garden, Bronx, New York, 10458, USA

    K. M. Cameron

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  1. S.-C. Chen
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  2. X.-P. Zhang
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  3. S.-F. Ni
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  4. C.-X. Fu
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  5. K. M. Cameron
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Correspondence to C.-X. Fu or K. M. Cameron.

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Chen, SC., Zhang, XP., Ni, SF. et al. The systematic value of pollen morphology in Smilacaceae. Plant Syst. Evol. 259, 19–37 (2006). https://doi.org/10.1007/s00606-006-0424-y

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