Monographs Details: Macrolobium suaveolens var. petiolatum 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 mediocris 10 m. alta, ramulis foliisque glabris. Petiola 7-13 mm. longa, canaliculata. Foliola 8-14 cm. longa, 2.5-5.5 cm. lata, arcuata ad falcata, ad apicem acuminata vel acuta et extremitate acuta vel obtusa, punctata vel epunctata, costa valdissime salienti supra, infra plana ad subsalienti, venulis prominulis ad prominentibus. Inflorescentiae 3.5-8 cm. longae, pedunculo 1.5-3 mm. longo; bracteis 1-1.5 mm. longis et latis, triangularibus, glabris, marginibus ciliolatis exceptis; pedicelli 2-4.5 mm. longi, minute puberuli; bracteolis 5-6.5 mm. longis, 3-4 mm. latis, oblongis vel ovalibus, plus minusve pilosis intus, extus puberulis. Sepala adaxilia 1.5-2 mm. longa, 1 mm. lata, triangularia, cetera 2.5-3.5 mm. longa, 1-2 mm. lata, lanceolata ad oblonga, acuta vel acuminata, plus minusve ciliolata vel glabra. Petali lamina 3.5-5.5 mm. longa, 4-5.5 mm. lata, orbicularis vel transverse ovalis, unguicilo 4-6 mm. longo. Filamenta 15.5-18 mm. longa, villosa basim versus. Stigma capitellatum ad peltatum. Stylus 10-16 mm. longus, glaber vel basim versus puberulus. Ovarium 1.5-2.5 mm. longum, 1-1.5 mm. latum, oblongum, marginibus minute puberulis, lateribus glabris, 2-3-ovulatum, gynophoro 2-3.5 mm. longo, minute puberulo.

Distribution and Ecology - Additional Specimens: Rio Taruma, Manaos, Amazonas, Brazil, Jan. 1941, Ducke 1012 (IAN, NY, US); Bella Vista, Rio Tapajoz, Para, Brazil, Jan. 1918, Ducke 10913 (H.A.M.P. No. 16912) (G, P, U, US); Mishuyacu, near Iquitos, Dept. Loreto, Peru, Dec. 1929. Kluz 717 (F, NY, US).

Discussion:

Type Collection: A. Ducke 35194, "silva terris altis ad meridiem Parana do Ramos, Parintins," Amazonas, Brazil, Jan. 1936 (HOLOTYPE US, isotype G, U).

There is but slight variability in the aspect of the specimens cited above, but Ducke 1012 shows several characteristics which are at definite variance with the rest of the material. In spite of this it is assigned here, but its characters are not incorporated in the description. It has pilosulose branchlets, shorter petioles, and longer adaxial sepals.