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.
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