What is the subtribe Glossonematinae (Apocynaceae: Asclepiadoideae)? A phylogenetic study based on cpDNA spacer

Abstract

Evidence from the chloroplast trnT‐L spacer, trnL intron and trnL‐F spacer shows the subtribe Glossonematinae of the tribe Asclepiadeae, hitherto composed of the Arabian and North African genera Glossonema, Odontanthera and Solenostemma, not to be monophyletic. While the affinities of Solenostemma cannot be determined with certainty at present, molecular, karyological and morphological evidence suggests that Glossonema and Odontanthera are closely allied to Pentarrhinum, an African genus of five species, belonging to the Cynanchinae. © 2002 The Linnean Society of London, Botanical Journal of the Linnean Society, 2002, 139, 145–158.

and the Cynanchinae (Apocynaceae ? Asclepiadoideae): a molecular, anatomical and latex triterpenoid study

“…The present results indicate that the small Afro-Arabian genera Pentarrhinum, Glossonema and Odontanthera are monophyletic, and together form a subclade within Cynanchum, as Liede et al (2002) have demonstrated. This clade is characterized by thick-walled, ornamented fruits.…”

“…Plotting of the morphological characters defined in Liede (1993b) on the strict consensus tree resulting from analysis of the combined molecular datasets shows that almost all characters used are homoplasious. Only thickwalled, ornamented fruits are restricted to Pentarrhinum (and Glossonema/Odontanthera, see Liede et al 2002), which forms a subclade of Cynanchum. Stem succulence (Fig.…”

On the systematic position of some Asian enigmatic genera of Asclepiadoideae (Apocynaceae)

“…(Liede, ), but, with both Glossonema and Odontanthera transferred to Cynanchinae (Liede & Täuber, ), Solenostemma remained unclassified. Liede, Meve & Täuber () observed a relationship of Solenostemma to Oxystelma and Asclepiadinae, but considered the data to be inconclusive. In the most recent phylogenetic analysis available (Liede‐Schumann et al ., ), four clades (Tylophorinae, Asclepiadinae, Calciphila and an almost unsupported clade of Solenostemma and Oxystelma ) formed a moderately supported polytomy sister to Cynanchinae.…”

Chromosome numbers of four species of Ochrosia sensu lato (Apocynaceae)

“…The occurrence of B-chromosome is known to be restricted to individual plant, and the chromosome number of 2n=23 would not be represented in the species as a whole. The presence of two B-chromosomes in Pentarrhinum insipidum in the Asclepiadoideae, the Apocynaceae was reported by Liede et al (2002 Table 1. Species, sources, and the chromosome numbers of Ochrosia Apocynaceae has been very rarely reported.…”