Monographs Details: Micrandra spruceana (Baill.) R.E.Schult.
Authority: Maguire, Bassett. 1967. The botany of the Guayana Highland--Part VII. Mem. New York Bot. Gard. 17: 1-439.
Family:Euphorbiaceae
Description:Distribution and Ecology - From the type locality on the Casiquiare which is more or less at the northern edge of the area of distribution, this tree has been traced over the Rio Negro and Vaupes into Brazil, as far as Manaos and Mato Grosso. VENEZUELA. Amazonas: Rio Negro at mouth of Casiquiare, 17 Dec 1947, Schultes & Lopez 9380 (NY); Rio Negro, Piedra Cocui, 22-23 Dec 1947, Schultes & Lopez 9466 (NY); sabanita edge, 1 km E of Maroa, alt 130 m, 1 Jul 1959, Wurdack & Adderley 43267 (flower only NY). COLOMBIA. Yaupes: Rio Negro, San Felipe (El Castillo) below confluence of rios Guainia and Casiquiare, 12 Dec 1947, Schultes & Lopez 9343-A (NY); Rio Negro, at confluence of rios Guainia and Casiquiare, Cano Ducuruapo (Igarape Rana), 13-17 Dec 1947, Schultes & Lopez 9352 (NY).

Discussion:

Cunuria spruceana Baillon, Adansonia 4: 288. 1864.

Type. “Spruce 3299” ad flumina Casiquiare, Vasiva et Pacimoni (1853,4) (isotype NY).

The Maroa specimen (No. 43267) differs from the type and the other specimens collected along the Guainia by more coriaceous leaves with slightly revolute margin, and on further collection this specimen may prove to be a different species.

Specimens from more southern and eastern parts of the range (Olivenca, Manaos, Tomantins) with large floral bracts and large foliaceous persistent stipules have been separated as Cunuria bracteosa Ducke [C. spruceana var bracteosa (Ducke) R. E. Schultes, Bot Mus. Leafl. 12: 345. 1947].

C. spruceana differs from C. sprucei by its more membranaceous, concolorous leaves, with non-revolute or only slightly revolute margin.

Distribution:Venezuela South America| Brazil South America| Colombia South America|