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1 December 2014 Reassessing Palynological Characters in the Subfamilies Periplocoideae and Asclepiadoideae (Apocynaceae): Taxonomic and Evolutionary Implications
Sayed Afzal Shah, Mushtaq Ahmad
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Abstract

The palynological characters of selected species of Periplocoideae and Asclepiadoideae were assessed and a taxonomic key made. We observed that translators of Periplocoideae are taxonomically more important structures than pollen tetrads. Within Periplocoideae, the flatter translators of Periploceae are evolutionarily more primitive than the spatulate translators of Cryptolepideae. The quantitative characters of pollinia are important for the genusand species-level taxonomy in Asclepiadoideae. Pollinium length/width ratio was studied for the first time and it was observed to be a useful character for the delimitation of the tribes and sub-tribes of Asclepiadoideae. The position of attachment of caudicles to pollinia is an overlapping character amongst the tribes and sub-tribes and can be utilised only for the taxonomy of genera. True sterile margins of pollinia are present only in Ceropegieae and pseudo-sterile margins are rarely present in other tribes. Asclepiadoideae within Apocynaceae, and Ascelpiadeae within Asclepiadoideae are separate entities, and Secamonoideae is closer to Periplocoideae than Asclepiadoideae on evolutionary grounds.

© 2014 AASP — The Palynological Society
Sayed Afzal Shah and Mushtaq Ahmad "Reassessing Palynological Characters in the Subfamilies Periplocoideae and Asclepiadoideae (Apocynaceae): Taxonomic and Evolutionary Implications," Palynology 38(2), 224-234, (1 December 2014). https://doi.org/10.1080/01916122.2014.893264
Published: 1 December 2014
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KEYWORDS
Asclepiadoideae
evolution
Pakistan
Periplocoideae
pollinaria
taxonomy
translators
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