Monographs Details: Moronobea riparia Spruce ex Planch. & Triana
Authority: Maguire, Bassett & Wurdack, John J. 1964. The botany of the Guayana Highland--Part V. Mem. New York Bot. Gard. 10: 1-278.
Family:Clusiaceae
Description:Distribution and Ecology - Distribution. A medium sized, white flowered, largely riverine tree of the upper Rio Negro-Rio Guainia drainage of Colombia and Venezuela, viz., the Rios Igana, Vaupes, Atabapo, Pacimoni, etc. A single collection, Wilson-Browne 544 (NY), from Iramaipang, Kanuku Mts., British Guiana, alt. 1500 ft., seems referable here.

Discussion:

M. riparia var. fimbrillata R. E. Schultes, Bot. Mus. Leafl. 17: 15. 1955, type: Puerto Colombia, Rio Guainia, Colombia, Schultes, Baker & Cabrera 18206.

M. riparia var. piraparanensis R. E. Schultes, Bot. Mus. Leafl. 17: 16. 1955, type: Comisaria Vaupes, Rio Piraparaná, Caño Oomoona, Schultes & Cabrera 17147.

Type. Ad flumina Casiquiari, Vasiva et Pacimoni (Venezuela), Spruce 3550 (NY, GH).

The variety fimbrillata was distinguished from typical M. riparia because of fimbrillate and somewhat more greenish petals. Eight of the eleven flowering specimens of M. riparia available to me have fimbrillate petals, however showing considerable variability in prominence of this character. The three other specimens showed incipient marginal ornamentation. No geographical pattern is evident. It may, therefore, be properly concluded that seldom, if at all, are the petal margins perfectly smooth. Neither the type of var. fimbrillata nor the two cited paratypes have been available to me.

The var. piraparanensis is said to be characterized by larger flowers with petals 7 cm long and leaves larger and subacute. A single specimen cited, the type, has not been available to me. Of materials examined, petals normally vary in length from 3 cm to 5 cm.

Distribution:Colombia South America| Venezuela South America| Guyana South America|