Notes:
Figueiredo (1995) recognised 2 subsp.: 1 (subsp. pervillei) occuring in Madagascar and eastern Africa and the other (subsp. ferrugineus (Verdc.) E.Figueiredo) confined to SE Kenya and NW Tanzania. We are inclined to accept this arrangement. However the plant is now known from more localities in Madagascar than is shown by Figueiredo.
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