Pentastemona is a genus in the family Stemonaceae, described as a genus in 1982.Steenis, Cornelis Gijsbert Gerrit Jan van. 1982. Blumea 28: 158-162Tropicos, Pentastemona Steenis In 1992, Duyfjes placed the genus in its own family, the Pentastemonaceae, but this is not widely accepted.Duyfjes-de Wilde, Brigitta Emma Elisabeth. 1992. Blumea 36: 552Tropicos, Pentastemonaceae Duyfjes It is the only monocot genus with pentamerous flower parts (i.e. five petals, five sepals, five stamens and five carpels).
The entire genus is endemic to the island of Sumatra in Indonesia.
Species Two species are accepted: Pentastemona egregia (Schott) Steenis Pentastemona sumatrana Steenis
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