Diplolepis, a genus from southern South America traditionally considered monotypic, has recently been shown from molecular data to include a few species that form a monophyletic group at the base of the MOG clade of Asclepiadoideae (Apocynaceae). The species transferred to Diplolepis
include plants from temperate South America mostly described under the generic name “Cynanchum”. Phylogenetic analyses of cpDNA trnT-trnF and rps16 sequences of 51 accessions of Ascle piadaceae using maximum parsimony and Bayesian inference methods show that
all “Cynanchum” from southern Argentina and Chile (except C. atacamense), Tweedia australis and Diplolepis form a well-supported monophyletic group. Within this group, three clades are recognized: two morphologically homogeneous groups from South Andean
forests and high elevation areas, and a more diverse group in flower and leaf morphology from southern South American desert and semidesert areas. The phylogenetic position of C. atacamense is equivocal but the species is transferred to Diplolepis based on morphological and biogeographical
coherence. The morphological, geographical and environmental characteristics of the three recognized clades of Diplolepis are discussed and eight nomenclatural changes are proposed.
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Document Type: Research Article
Universidad Nacional de la Patagonia SJB, Ruta 259, Km 4, Esquel, Argentina
INIBIOMA, Conicet-Universidad Nacional del Comahue, Quintral 1250, 8400 Bariloche, Argentina
INIBIOMA, Conicet-Universidad Nacional del Comahue, Quintral 1250, 8400 Bariloche, Argentina;, Email: [email protected]
Publication date: 2011-06-01
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