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- W2156845868 abstract "The systematic status of Disa draconis (L.f.) Sw. is revised following extensive field studies of population variation in the Western Cape, South Africa. Principal component and cluster analyses revealed clear distinctions between populations from sandplain, semi-arid and montane environments. Diagnostic characters were found in each of the population clusters indicating the existence of a species complex, rather than a single taxon as in the current taxonomy. We propose, therefore, that the name D. draconis (L.f.) Sw. be restricted to the individuals of the sandplain populations from which the type was collected. We reinstate an earlier name, Disa harveiana Lindl., to describe the montane populations which possess several autapomorphic characters. We also show that the geographical variation in spur length and flowering time within this species can be partitioned into two geographically distinct subspecies: D. harveiana subsp. harveiana and D. harveiana subsp. longicalcarata Johnson & Linder. The populations from the semi-arid Karoo region were recognized as a distinct new species, Disa karooica Johnson & Linder, on the basis of their peculiar petal structure. A cladistic analysis indicated that the three species forming the D. draconis complex form a monophyletic and relatively specialized lineage within Disa sect. Coryphaea. The revised classification also has important conservation implications as D. draconis, previously considered a common species, is now restricted to a few highly threatened populations on the west coast near Cape Town." @default.
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- W2156845868 date "1995-08-01" @default.
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- W2156845868 title "Systematics and evolution of the Disa draconis complex (Orchidaceae)" @default.
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- W2156845868 doi "https://doi.org/10.1111/j.1095-8339.1995.tb00473.x" @default.
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