Deguelia tenuiflora (Leguminosae, Papilionoideae), a remarkable new species from the Brazilian Amazon

Abstract

A new species of Deguelia from north of Manaus (Amazonas state), Brazil, is described and illustrated here as Deguelia tenuiflora. It is vegetatively similar to D. amazonica, while its flowers resemble D. negrensis and D. scandens. This new species exhibits the following unique characteristics: mostly unifoliolate leaves covered abaxially by a peculiar indumentum, and calyx with vexillary lobes triangular-depressed, which allows for its recognition as a distinct species. We provide a table of characters for distinguishing the new species from congeners and a distribution map of the new taxon.