Monographs Details: Croton subincanus Müll.Arg.
Authority: Maguire, Bassett. 1965. The Botany of the Guayana Highland. Mem. New York Bot. Gard. 12 (3): 1-285.
Family:Euphorbiaceae
Description:Distribution and Ecology - Distribution. Bushy herb or shrub 1-3 m high, along stream course and rocky ledges in British Guiana, Bolivar, Venezuela, and Territorio do Rio Braneo, Brazil. BRITISH GUIANA. Dense forest, northwestern slopes of Kanuku Mountains, Moku-moku Creek, Takutu tributary, alt. 150-400 m, 31 Mar-16 Apr 1938, A. C. Smith 3394 ([male][female] fl. NY). VENEZUELA. Gran Sabana, south of Mt. Roraima, Rio Kukenan, alt. 1065-1220 m, Bolivar, 1 Oct 1944, Steyermark 59052 ([female] fl. NY). BRAZIL. Frequent along stream course, Serra Tepequem, alt. 1130 m, Terr, do Rio Braneo, 29 Nov 1954, Maguire d- Maguire 40097 ([male][female] fl., fr. NY).

Discussion:The three specimens seen by me differ from C. hostmanni by a distinctly woolly indumentum on the lower side of the leaf. But I am not at all certain whether this represents a good enough distinction and whether this binominal will not have to be reduced to C. hostmanni after intensive collecting and study. Müller Argoviensis places this binominal into sect. Decarinus, which is characterized by the inequality of calyx lobes, whereas he places C. hostmanni into sect. Eucroton which has equal calyx lobes. Lanjouw who has examined the C. hostmanni original makes no mention of equality of calyx lobes and bases the distinction on the obtuseness of leaves in C. hostmanni and aeuteness in C. subincanus, which by itself is a very unreliable feature.
Distribution:Guyana South America| Venezuela South America| Brazil South America|