Shrub 5-10 dm, erect or ascending, simple or sparingly branched, ordinarily closely canescent throughout; petioles 1-3 mm; lfls crowded, 13-20 pairs, 1-2 cm, inconspicuously or scarcely punctate; racemes usually clustered in groups of 5-20+, the terminal one 5-15 cm, the others shorter; cal-lobes lanceolate, subequal, mostly 1-1.5 mm, half to two-thirds as long as the tube; banner 4.5-6 mm; fr canescent, 4 mm; 2n=20. Dry prairies and sandy open woods; s. Mich. to Minn. and Sask., s. to Ill., Mo., Ark., Tex., and N.M. June, July. The rare hybrid with no. 4 [Amorpha fruticosa L.] is A. خotha E. J. Palmer.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
This species is infrequent and is restricted to the area shown on the map. It is found in dry, sandy or gravelly soil on knolls and ridges or in a prairie habitat in the open along roadsides or in open woodland.