Type. Surumu, in forest of Serra de Mairary, alt 900 m, Rio Branco, Brazil, Feb 1909, E. Ule 7947 (photo of Berlin type in NY).
Note; Actinostemon guyanensis Pax & K. Hoffm. (Pflanzenreich 52: 80. 1912 ), British Guiana, Schomburgk 1412, had no flowers or fruit. The type was in Berlin, and was destroyed.