Monographs Details: Macrolobium unifoliolatum var. schultesii R.S.Cowan
Authority: Maguire, Bassett & Wurdack, John J. 1957. The Botany of the Guiana Highland -- Part II. Mem. New York Bot. Gard. 9 (3): 235-392.
Family:Caesalpiniaceae
Description:Latin Diagnosis - A var. unifoliolatum petiolis 3-4 mm longis, foliolis ad costam puberulis, costa supra salienti, inflorescentia 6.5-12 cm longa, axe dense puberulo, bracteis puberulis extus, pedicellis 4-9 mm longis, dense puberulis, bracteolis 9-10.5 mm longis, extus dense puberulis, sepalis dorsualiter pilosulosis ad apicem, petali lamino rotundo, 5.5 mm diametro, filamentis 12.5 mm longis, stylo 12.5 mm longo differt.

Discussion:

TYPE: bush, flowers white, Raudal Yayacopi (La Playa) and vicinity, about 800 ft alt., Rio Apaporis, Amazonas-Vaupes, Colombia, April 15, 1952, Richard E. Schultes & I. Cabrera 16209 (NY). Paratype: same data and collectors, 16940.

This species is so utterly different from any previously described, in respect to the leaves, that the casual observer may even fail to relate it to this genus. Not only are the leaves unifoliolate but the leaflet is equilateral and differently shaped from those of most of the other species in the genus. In leaflet shape, at least, the new species is similar to members of the M. campestre-M. arenarium complex but its connection with any known species is remote.

The aspect of the typical variety and of variety schultesii is very similar, and it was originally thought that this material was quite uniform. It will be noted, however, that there a number of characteristics separating the two varieties. It is a pleasure to name this taxon for one of the collectors of the type material, Dr. Richard Evans Schultes.