Heterostemon amoris (Leguminosae, Detarioideae), a new species from Colombia and a key to the species of Heterostemon

Heterostemon amoris a new species from Colombia is described, illustrated, and a key to the species of the genus is presented. Heterostemon amoris is characterized by its leaves with 5-7 pairs of leaflets, basal pair of leaflets 0.6-0.8 × 0.4-0.6 cm, considerably smaller and falcate, intermediate leaflets 3.8-5.5 × 1.1-2.0 cm, ovate to obovate, and terminal pair of leaflets 2.0-2.3 × 0.7-0.8 cm, ovate, shorter than the intermediate ones. This new species is only known from four localities in the departments of Guainía and Vaupés.