Uma nova espécie de Croton sect. Geiseleria (Euphorbiaceae) da Amaz?nia Oriental brasileira

摘要

A new species of Euphorbiaceae from Amazonian Brazil, Croton strobiliformis Secco, is described. This species is superficially similar to C. hirtus L'Heritier, but differs in having branches sparsely pubescent, glabrescent, leaves with dense indument of stellate-porrects trichomes on both sides, slightly rough abaxially, with veins conspicuously more evident abaxially than adaxially, stipules 2, aciculate, inflorescence strobiliform, with many pistillate flowers grouped at the base, petals of staminate flower internally with dense indument of villose trichomes, stamens with villose trichomes at the base, and fruit with indument velutinous. The systematic position of C. strobiliformis in relation to the sections of Croton is discussed.