Monographs Details: Mimosa somnians Humb. & Bonpl. ex Willd.
Authority: Irwin, Howard S. 1966. Contributions to the botany of Guiana. III. Leguminosae Mimosoideae. Mem. New York Bot. Gard. 15: 96-111.
Description:Distribution and Ecology - BRAZIL. Amapa: Rio Oiapoque, Irwin, Egler, & Pires 47140. VENEZUELA. Bolivar: Altiplanicie de Nuria, Steyermark 88785.


The Brazilian collection was made very near the locality from which Froes 25153 was taken. However, the more recent material differs in being quite devoid of the glandular hairs characteristically found on the stem, lower peduncle, and lower petiole. Both Amapa specimens lack the stem and rachis thorns typical over most of the range of the species. Populations of unarmed plants apparently exist elsewhere, e.g., in Colombia (Cauca: von Sneidern 2286; Huila: Rusby & Pennell 1018) and Bolivia (Steinbach 5181). Steyermark 88785 closely resembles other material from nearby stations. Although frequently collected in Amazonia and Guayana, M. somnians is as yet unknown in Guiana between Edo. Bolivar, Venezuela, and French Guiana

Distribution:Brazil South America| Venezuela South America|