Source: Collecitons database
[Apios americana var. turrigera Fernald, more]
From Flora of Indiana (1940) by Charles C. Deam
Infrequent to rare in all parts of the state in soil with little humus in low ground in woods about ponds, sloughs, and lakes.
Rhizomes with 2 or more tubers; stipules and stipellules minute, caducous; lfls of the principal lvs 5-7, lanceolate to ovate, 4-6 cm, glabrous to short-hairy beneath; racemes dense (or looser southward), with solitary or paired brown-purple fls 10-13 mm; standard broader than long, usually retuse; fr 5-10 cm; 2n=22, and perhaps 44. Moist woods; Que. to Minn. and S.D., s. to Fla. and Tex. July, Aug. (A. tuberosa; Glycine apios)
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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