Monographs Details: Neptunia pubescens var. microcarpa (Rose) Windler
Authority: Isley, Duane. 1973. Leguminosae of the United States: I. Subfamily. Mimosoideae. Mem. New York Bot. Gard. 25 (1): 1-152.
Discussion:Neptunio, microcarpa Rose N. palmeri Britt. & Rose S Texas w to Val Verde Co. Mostly dry limestone to sandy soils, native and ruderal. April-June (Sept.). Mexico.