Monographs Details: Neptunia pubescens var. pubescens
Authority: Isley, Duane. 1973. Leguminosae of the United States: I. Subfamily. Mimosoideae. Mem. New York Bot. Gard. 25 (1): 1-152.
Discussion:Neptunio pubescens var. floridana (Small) B. L. Turner
N. pubescens var. lindheimeri (Rob.) Turner
N. manzatlana Britt. & Rose
N. floridana Small
Texas to Florida. Texas: moist to dry sandy soils, native and ruderal, especially roadsides, April-June (Sept.). Florida: open pinelands or pine-palmetto scrub, often near ocean, roadsides and other ruderal areas; sandy to coral soil. March-Aug. South America.
I have reviewed South American as well as U.S. material of this variety and, as Windier (1966), am unable to discern any significant difference.