Subtribal division of Ceropegieae (Apocynaceae­Asclepiadoideae)

Abstract

Monophyly and sister group relationship of Ceropegieae and Marsdenieae, the two Asclepiadoideae tribes possessing erect pollinia, are confirmed by molecular investigation of non­coding cpDNA markers (trnT­L and trnL­F 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 Conomitra­Leptadenia­Orthanthera subclade is sister to the Anisotoma­Neoschumannia­Riocreuxia­Sisyranthus subclade and to the large subclade comprising the stem­succulent stapeliads, Brachystelma and Ceropegia. Following these results, subdivision of Ceropegieae into four subtribes, Anisotominae, Heterostemminae, Leptadeniinae and Stapeliinae, is proposed.

Horizontal Transfer of DNA from the Mitochondrial to the Plastid Genome and Its Subsequent Evolution in Milkweeds (Apocynaceae)

“…All members of tribe Asclepiadeae (subfamily Asclepiadoideae) with successful PCR amplification had spacer regions as large as or larger than A. syriaca . The large spacer region was also present in Eustegia (table 1), an enigmatic monotypic African genus that, while possessing synapomorphic features of tribe Asclepiadeae (Bruyns 1999), has been resolved in phylogenetic analyses of plastid sequence data alternatively as sister to the rest of the Asclepiadeae (Liede 2001) or as the sister group of the tribes Marsdenieae and Ceropegieae (Rapini et al 2003; Meve and Liede 2004; Rapini et al 2007). Members of tribes Fockeeae, Marsdenieae, and Ceropegieae of Asclepiadoideae and subfamilies Secamonoideae, Periplocoideae, and Apocynoideae did not show evidence of an insertion in the spacer region (table 1).…”

Systematics ofPrestonia(Apocynaceae: Apocynoids: Echiteae) 80 Years After Woodson

“…Endress and Bruyns (2000) recognized five subfamilies: Rauvolfioideae and Apocynoideae from the traditional Apocynaceae, and Periplocoideae, Secamonoideae, and Asclepiadoideae from the traditional Asclepiadaceae. Since then a number of phylogenetic studies have contributed to the resolution of relationships at the tribal, subtribal, or generic level, which has led to the reorganization or description of tribes and subtribes and the synonymization of several genera (e.g., Meve & Liede, 2004;Simões et al, 2004Simões et al, , 2006Simões et al, , 2010Liede-Schumann et al, 2005;Rapini et al, 2006Rapini et al, , 2011Endress & Hansen, 2007;Endress et al, 2007aEndress et al, , 2007bLivshultz et al, 2007;Silva et al, 2012;Khanum et al, 2016;Meve et al, 2017;Morales et al, 2017). Despite these advances, many groups are still unresolved or the resolution is too low to accurately define their relationships.…”

Sarcolobus cambogensis (Marsdenieae, Asclepiadoideae, Apocynaceae): A new rheophytic shrub from Cambodia

“…Placement of the new species in Asclepiadoideae tribe Marsdenieae is unambiguous; it has the diagnostic characters of the tribe including contorted corolla lobes in the bud, hyaline anther apical connective appendages without a basal constriction, pollinaria with pollinia acropetal to the corpuscle in situ, pollinia without a pellucid margin, and ovaries without evident styles (Bruyns & Forster, 1991, Omlor 1998, Endress & Bruyns 2000, Meve & Liede 2004. Generic placement of the species is much more problematic.…”