Monographs Details: Sauvagesia duidae Steyerm.
Authority: Maguire, Bassett & Wurdack, John J. 1961. The botany of the Guayana Highland--part IV (2). Mem. New York Bot. Gard. 10: 1-87.
Discussion:Since both S. duidae and N. grandifolia Dwyer have similar chartaceous acuminate leaf blades, the only apparent valid morphologic distinction between these two species is in the flower size. In S. duidae, the fruiting sepals (dry) are 4.2-5.6 mm long, the inner corona 3.6-3.9 mm, and the anthers 1.8-2.2 mm. In the Brazilian species, the corresponding measurements (dry) are 9.1-9.5 mm, ca. 7.5 mm, and 2.3-2.5 mm. In Venezuela, in addition to the type collection, S. duidae is known from the Yapacana savanna edge at 125 m alt. (Maguire cf- Wurdack 34521) ; for Colombia the species is known from two Amazonas collections: Rio Miritiparana, alt. 200 m, Schultes & Cabrera 15701 (US); Rio Popeyaca, alt. 200 m, Schultes & Cabrera 16183 (US). For S. grandifolia, only the holotype (Glaziou 6478, US) is known to us.