From Flora of Indiana (1940) by Charles C. Deam
This species is locally frequent in the northeastern part of the state where it is usually found at the base or on the lower part of black and white oak slopes. In the southern part of the state it is locally frequent on wooded slopes in black and white oak woods. It can be found, no doubt, in all of the hilly counties and in more of the counties of the lake area.
Trailing or climbing perennial to 1 m; lfls usually 5-10 pairs, elliptic to oblong-lanceolate, 1-2 cm, rounded to obscurely retuse at the tip, mucronate; stipules lanceolate or half-sagittate, entire; racemes (peduncle included) 6-10 cm, loose, with 7-20 white fls 8-12 mm; cal nearly regular, 3 mm or less, the lobes essentially equal, broadly triangular, under 1 mm; fr 1.5-3 cm; 2n=14. Moist woods and thickets; N.Y. to Wis., s. to Fla. and Tex. May, June.
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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