Type: Venezuela. Amazonas: Dept Rio Negro, dry forest and scrub vegetation on ESE facing slope above Rio Marawinuma E of "Puerto Chimo" camp, dominant on open slope, ca. 600 m alt., Lat. 0º50'N, Long. 66°0'W; 26 April 1984, W. W. Thomas 3245 (holotype, US; isotypes. NY, VEN).