Monographs Details: Macrolobium gracile var. machadoense R.S.Cowan
Authority: Maguire, Bassett, et al. 1953. The Botany of the Guayana Highland. Mem. New York Bot. Gard. 8 (2): 87-160.
Family:Caesalpiniaceae
Description:Latin Diagnosis - Arbor 20 m. alta, 6 cm. diametro, ramulis dense pilosulis. Stipulae 4.5-5.5 mm. longae, 0.5 mm. latae. Petiolus 2-3 mm. longus, canaliculatus, pilosulus. Foliorum lamina lanceolata, 20-25-jugata; rachibus 5.5-9 cm. longis, supra uncinatopuberulis, infra sparse pilosulis ad glabris. Foliola 2-15 mm. longa, 1-5 mm. lata, oblonga, ad basim inaequilateralia, ad apicem truncata, emarginata, minute apiculata, supra in costa puberula, infra plus minusve pilosula, costa ambobus lateribus salienti, venulis obscuris. Inflorescentiae 4.5-5 cm. longae, axe puberulo, flos ignotus. Fructus immaturus 11-11.5 cm. longus, oblongus, apicem versus latior, carpophoro 5 mm. longo, pilosulo.

Discussion:

Type Collection: B. A. Krukoff 1350, "upper Machado River, near Tabajara," Matto Grosso, Brazil, Nov,-Dec. 1931 (HOLOTYPE NY, isotypes A, F, G, MO, P, U, UC). Known only from the type collection.