A New Species of Croton sect. Luntia (Euphorbiaceae) from Western Amazonian Brazil

摘要

A new species of Croton, C. subasperrimus, is described and illustrated from a previously unexplored area of Amazonas State, Brazil. It belongs to Croton sect. Luntia subsect. Cuneati because of its pinnate leaf venation, slightly reduplicate pistillate calyx, partially bisexual basal cy-mules, presence of lepidote trichomes, low stamen number, and multifid stigmas. It differs from related species in its stellate-lepidote trichomes that sometimes have tall porrect central rays and in its smaller, concolorous leaves with an obtuse base and stip-itate glands along the margins.