Thismia sumatrana Suetsugu & Tsukaya

It is known from only a single collection comprising of one flowering and one fruiting individual. Thismiasumatrana was collected from a forest floor beside a rheophytic zone along Anak Air Ganggu (Ganggu Stream), 0°33'S, 100°21'E, at Sipisang Village, Padang Pariaman, West Sumatra, Indonesia. The area was covered by mixed primary and secondary forest along a stream, where relatively natural conditions remained. For example, there were many individuals of a rare and large herbaceous plant, Amorphophallustitanum (Becc.) Becc. (Araceae). In addition, many individuals of a rheophytic plant, Furtadoasumatrensis M.Hotta (Araceae), grew on small rocks both in the stream and on the stream bank (Mori and Okada 2001).