Climbing to 10-15 m; petioles 1-2 cm; lfls 2, oblong or elliptic, subacuminate, entire, narrowed to a cordate base; cal 5-8 mm; cor 5 cm; fr 15-20 cm; seeds 3 cm; 2n=40. Moist woods; s. Md. to s. O. and s. Mo., s. to Fla. and La. May, June. (Anisostichus c.; A. crucigera)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.