Systematics and phylogeny of the Satyrium erectum group (Orchidaceae), with descriptions of two new species from the Karoo region of South Africa
作者： S. D. JOHNSON , H. KURZWEIL
DOI: 10.1111/J.1095-8339.1998.TB02096.X
关键词: Pollination 、 Monophyly 、 Evolutionary biology 、 Sister group 、 Ecology 、 Biology 、 Synapomorphy 、 Systematics 、 Satyrium erectum 、 Orchidaceae 、 Allopatric speciation
摘要: Abstract Two spectacular new orchid species from the semi-arid Karoo region of South Africa are described here. Both have been confused withSatyrium erectumSw. in past, yet clear diagnostic characters which justify their recognition as distinct species.Satyrium pulchrumS. Johnson & Kurzweilsp. nov., known only an isolated granite inselberg Namaqualand, appears to be sister taxon toS. erectum, whereasSatyrium pallensS. several populations along southern margins Karoo, has closer affinities toSatyrium longicolleLindl. These four form a monophyletic group characterized by synapomorphies. The allopatric distribution pattern and considerable divergence floral suggest that speciation involved shifts pollination system geographically populations.
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