Monographs Details: Baptisia alba (L.) Vent. x B. perfoliata (L.) R.Br.
Authority: Isely, Duane. 1981. Leguminosae of the United States. III. Subfamily Papilionoideae: tribes Sophoreae, Podalyrieae, Loteae. Mem. New York Bot. Gard. 25 (3): 1-264.
Description:Species Description - Plants ascending, wiry-stemmed, divaricately branched. Leaves petioled, the lower trifoliolate, or perfoliate and simple, the upper bifoliolate or simple, irregularly passing into stipules; larger leaflets ovate or obovate, 3-5 cm, 1.6-1.8 r. Stipules persistent and foliaceous, sessile or perfoliate, various in size, accompanied or not by leaf blades. Flowers 1.3-1.5 cm in small or wispy racemes or some axillary, yellow. Ovules ca. 12. Legumes resembling small ones of B. alba, exserted-stipitate, cylindric, ca. 2 cm x .8-1.3 cm, coriaceous, tan.

Discussion:B. x fulva Larisey (1940). B. albescens x perfoliata. B. perfoliata x alba. B. perfoliata x albescens. Larisey (1940a) believed that two ancient specimens (one 1860, Waynesboro, Georgia, the other 1900, Augusta, Georgia) represented this hybrid, and a few recent sheets can be reasonably attributed to it. Alston collections (TEX) explicitly or by implication come from mixed populations, and Turner has annotated one (Alston B-l) as having been confirmed as an Fl by chromatography. The ovule number is intermediate between that of the putative parents.