Monographs Details: Macrolobium campestre var. medium R.S.Cowan
Authority: Cowan, Richard S. 1953. A taxonomic revision of the genus Macrolobium (Leguminosae-Caesalpinioideae). Mem. New York Bot. Gard. 8 (1): 257-342.
Family:Caesalpiniaceae
Description:Latin Diagnosis - Arbor media, ad 20 m. alta, 30 cm. diametro, ramulis glabris vel raro sparse puberulis. Petiolus 7-25 mm. longus. Folia 2-3-jugata, paripinnata et pseudo-imparipinnata; rachibus 20-60 mm. longis, teretibus ad subcanaliculatis. Petiolulis 3-6 mm. longis. Foliola 4.5-12 cm. longa, 2.5-5.5 cm. lata, ovata, lanceolata, vel elliptica, ad basim acuta vel obtusa, ad apicem acuta ad acuminata. Inflorescentiae 4-9 cm. longae, axe puberulo; bracteis 5.5-7 mm. longis, 1.5-2.5 mm. latis, ellipticis vel lanceolato-ellipticis, puberulis. Hypanthium glabrum. Petali lamina 4-5.5 mm. longa, 5-8 mm. lata, unguicilo 5.5-7 mm. longo. Ovarium glabrum vel margine sparsissime et minutissime puberulum, 3-4-ovulatum, gynophoro 3.5-4 mm. longo, sparse puberulo.

Distribution and Ecology - Additional Specimens: BRAZTL: Para: Aderson Camp near Tavio, Boa Vista, Rio Tapajoz, April 1932, da Costa 325 (F,G); Tapana, Belem, June 1918, Ducke (H.A.M.P. No.) 17036 (H.J.B.R. No. 10926) (G, RB, U, US). Vernacular Names: Brazil: "igarana xixy," "igarana vermelha."

Discussion:

Type Collection: A. Ducke (H.J.B.R. No.) 10926-A, "Belem do Para," Brazil, April 1926 (HOLOTYPE US, isotype U).