From Flora of Indiana (1940) by Charles C. Deam
Very local in the northwestern counties. Outside the range indicated on the map it has been reported from Kosciusko and Tippecanoe Counties. I have found it on a high, gravelly, wooded bank, in open places in woods, in prairie habitats, and most often in depressions in low, sandy black and pin oak woods where tree growth is sparse or absent. Judging from the vegetation in such depressions the soil is slightly acid. In 1923 I found an aberrant form, probably a hybrid of this species, in Starke County with 40 flowers on the terminal raceme. This genus is now being monographed and this plant will be given consideration.
Plants to 1 m, widely branched; stipules setaceous, deciduous; petioles 1-3 mm; lfls obovate from a cuneate base, 1-3(-4) cm, rounded to slightly retuse at the tip; racemes very numerous, terminating most of the branches; bracts setaceous, caducous; pedicels 3-6 mm; fls yellow, 8-13(-16) mm; cal glabrous; pods thick-lenticular to subglobose, 8-15 נ6-8 mm; stipe 5-10 mm; 2n=18. Dry sterile or sandy soil; s. Me. to Ga. and Tenn., w. occasionally to s. Ont., Mich., Ind., Ill., and (only intr.?) to Wis. and Minn. June, July. A hybrid with no. 3 [Baptisia lactea (Raf.) Thieret] is B. ؤeamii Larisey; one with no. 4 [Baptisia alba (L.) R. Br.] is B. ذinetorum Larisey.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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