Monographs Details: Croton potaroensis Lanj.
Authority: Maguire, Bassett. 1965. The Botany of the Guayana Highland. Mem. New York Bot. Gard. 12 (3): 1-285.
Family:Euphorbiaceae
Scientific Name:Croton potaroensis Lanj.
Description:Distribution and Ecology - Distribution. Shrub 1-2 m, rarely a tree 4 m, British Guiana, Bolivar and Amazonas, Venezuela. BRITISH GUIANA. Potaro River: Tumatumari, 20 Sep 1923, Linder ([female][male] fl. N Y ) ; on rocks along river, Amatuk, 31 Aug 1937, Sandwith 1245 ([male][female] fl. NY). VENEZUELA. Bolivar: Rio Caroni, Camp Uriman, alt. 380-400 m, 7 Sep 1954, Bernardi 1678 ([male] y. fr. NY); Uriman Savanna, alt. 400 m, 18 Sep 1946, Cardona 1611 ([male][female] fl. fr. NY); rapids of Kurukuya, alt. 740 m, 9 Oct 1946, Cardona 1781 ([male] fl. NY); Maria Esperma Falls, base of Sierra Ichún, Ichun River, tributary of Rio Paragua, alt. 500 m, 28 Dec 1961, Steyermark 90306 ([male] fl. NY). Amazonas: Common on rocks, Culebra Rapids, Rio Cunucunuma, alt. 150 m, 23 Dec 1950, Maguire, Cowan & Wurdack 30349 (fr.); locally frequent on rocky island, between Raudal Gallineta and Salto Grallineta, alt. 120-130 m, Rio Siapa, 19 Jul 1959, Wurdack and Adderley 43499 ([male] fl. NY).

Discussion:C. bartlettii Lanjouw, Meded. Bot. Mus. Utrecht 12(31) : 460. 1934. Type. Akawing Cuyuni Eiver, British Guiana, fl. Oct. 1904, Bartlett 8082 (K). C. cardonei Croizat, Bol. Soc. Venez. Ci. Nat. 11: 79. 1947. Type. Gleason 329 (K, isotype [male][female]fl. NY). The British Guiana specimens have narrow lanceolate leaves; the Bolivar specimens have ovate leaves 2-3 cm wide. The leaves of the Amazonas plants are smaller than those from Bolivar, being 7-11 mm wide and 2.7-4.0 cm long. Collection No. 43499 is penninerved throughout.
Distribution:Guyana South America| Venezuela South America|