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Notes:
This account is based on the monograph by Manktelow, although she did not study the Malagasy spp in detail, and further work is clearly needed. In addition to the 2 species treated here for Madagascar, an single Boivin specimen is known of P. dorsiflora, a species known from Reunion, but it is assumed that this is a labelling error since Boivin also collected the sp in Reunion. A Comorean sp, P. verticillaris is also known from a single doubtful specimen from Madagascar. A specimen of P. imbricata annoted by Manktelow 'unusually tiny specimen' from Marojejy, appears distinct in other ways, and we believe this represents an undescribed sp.
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