Monographs Details: Hevea benthamiana Müll.Arg.
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 - Northwestern part of Rio Negro, Japura, lca, Solimos, lower Juma, lower Jutahy, Upper Orinoco, Casiquiare and Upper Orinoco of Venezuela. VENEZUELA. Amazonas: Rio Orinoco, Rio Cuao, mixed high forest, vicinity of Base Camp at alt 125 m, 17 Jan 1949, Maguire A Politi 28427 (fr. NY); Cerro Sipapo, mixed montane forest, trail from Base Camp at alt 125 m, 25 Jan 1949, Maguire & Politi 28597 (fr. NY); Rios Pacimoni-Yatua, Casiquiare, Igarape forest of Upper Rio Yaciba at alt 160 m, 6 Dec 1953, Maguire, Wurdack A Bunting 36688 (sterile NY); Cerro de la Neblina, Rio Yatua, locally frequent in lowland forest near Base Camp at alt 170 m, 29 Jan 1954, Maguire, Maguire & Wurdack 37398 (sterile NY); Rio Siapa, frequent, black water cano (from Cerro Aracamuni) on left bank of Rio Siapa just above Raudal Gallineta at alt 130-140 m, 23 Jul 1959, Wurdack A Adderley 48599 (sterile NY). COLOMBIA. Vaupes: Igarape Rana, confl. vios Guainia & Casiquiare, 13 Dec 1947, Schultes A Lopez 9364-A (fl. NY); Rio Negro, vicinity of Piedra Cocui, 27 Dec 1947, Schultes A Lopez 9409, 9479 (fl. NY).

Discussion:

Siphonia discolor Benth., Jour. Bot. & Kew Misc. 6: 369. 1854. Type. “Prope Panure ad Rio Uaupe,” Spruce 2560, Terr. Amazonas, Brazil (isotype NY).

With some hesitation I include here the sterile specimens: VENEZUELA. Bolivar: Sierra Ichun, cercanias del Salto Maria Espuno, del rio Ichun, base de la Sierra de Ichun, tributario de rio Paragua, lat 4°46'; long 63°18', alt 500 m, 28 Dec 1961, Steyermark 90395 (NY sterile). The specimen carries the note: “see fruit collection.” No fruit is available in NY; perhaps it is available in VEN).

Distribution:Venezuela South America| Colombia South America|