Subtribal division of Ceropegieae (Apocynaceae – Asclepiadoideae)

Ulrich Meve and Sigrid Liede

Abstract:

Monophyly and sister group relationship of Ceropegieae and Marsdenieae, the two Asclepiadoideae tribes possessing erect pollinia, are confirmed by molecular investigation of non-coding cpDNA markers (trnT-L and trnL-F spacers, and the trnL intron). In Ceropegieae, the analyzed taxa fall in four subclades. The Heterostemma subclade is sister to other three subclades, of which the Conomitra-Leptadenia-Orthanthera subclade is sister to the Anisotoma-Neoschumannia-Riocreuxia-Sisyranthus subclade and to the large subclade comprising the always stem-succulent stapeliads, Brachystelma and Ceropegia. Following these results, subdivision of Ceropegieae into four subtribes, Ceropegiinae, Anisotominae, Heterostemminae and Leptadeniinae, is proposed.

Key Words: Anisotominae, Apocynaceae-Asclepiadoideae, Ceropegieae, Ceropegiinae, cpDNA, Heterostemminae, Leptadeniinae, Marsdenieae, molecular systematics, phylogeny, taxonomy.

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