Monographs Details: Tocoyena orinocensis Standl. & Steyerm.
Authority: Maguire, Bassett. 1965. The Botany of the Guayana Highland. Mem. New York Bot. Gard. 12 (3): 1-285.
Description:Distribution and Ecology - Distribution. Known only from igneous rock outcrops bordering the Orinoco River, Amazonas, Venezuela. In addition to the type collection, the following are referable here: At edge of crystalline laja, 1-2 k m east of Hotel Amazonas, Puerto Ayacueho, Maguire, Wurdack d Bunting 36074; lugares poco humedos de las lajas, unos 10 km al sur del Puerto Ayacueho, Foldats 3585; cerca del Puerto Ayacueho, sobre lajas, Foldats 3528; banks of the Orinoco, Chaffanjon 184.

Distribution:Venezuela South America|