Monographs Details: Retiniphyllum concolor (Spruce ex Benth.) Müll.Arg.
Authority: Maguire, Bassett. 1965. The Botany of the Guayana Highland. Mem. New York Bot. Gard. 12 (3): 1-285.
Family:Rubiaceae
Description:Distribution and Ecology - Distribution. British Guiana, southern Venezuela, and Amazonian Brazil and Colombia. BRITISH GUIANA. Pakaraima Mountains, Kamarang River-Wenamu trail, Paruima Falls to Paruima Mission, Maguire & Fanshawe 32464; low bog-forest bordering Mokay-dai Savannah near mouth of Mokay River, Upper Mazaruni River basin, at alt. ca. 490 m, S. S. d C. L. Tillett 45349. VENEZUELA. Estado Bolivar: Sierra Ichun, at alt. 625-725 m, Steyermark 90254; cumbre del Cerro Apacara, asociado con Bonnetia en bosques pluviales altos, Cardona 1602; forested slopes, Abacapa-tepui, Chimanta Massif, at alt. 750-1100 m, Steyermark 74845; just above Techine-meru along Rio Tirica, at alt. 470 m, Steyermark & Wurdack 128. Territorio Federal Amazonas: riverine forest just south of Maroa, Rio Guiania, at alt. 120-140 m, Maguire, Wurdack & Bunting 36454; Clusia "moss-forest" just south of Camp 3, Cerro de la Neblina, Rio Yatua, at alt. 650-700 m, Maguire, Wurdack & Bunting 36824; along Cano San Miguel just above Limoncito (15 km from Rio Guiania, at alt. 100-140 m, Wurdack & Adderley 43234; southeastern-facing slopes along Caño Negro, Cerro Duida, at alt. 305 m, Steyermeirk 57947; selva de tierra firma, Capihuara, Casiquiare, Williams 15556; selvas de Maroa, at alt. 127 m, Williams 14192, 14228. BRAZIL. Uanauaca, Spruce 2028 (holotype). COLOMBIA. Amazonas: headwaters of Quebrada Guacaya, Río Miritiparaná, Cerro de la Gente Chiquita, Schultes & Cahrera 16494. Vaupes: San Felipe and vicinity, Rio Negro below confluence of Rio Guainia and Rio Casiquiare, Schultes, Baker & Cabrera 18244; Cano del Caribe between Isla del Venado and San Jose, Rio Guainia, Schultes, Baker & Cabrera 18255.

Discussion:Commianthus concolor Spruce ex Benth. in Hook. Kew Jour. 5: 235. 1853.
Distribution:Guyana South America| Venezuela South America| Brazil South America| Colombia South America|