Lvs broadly ovate to subrotund, abruptly acuminate, with rounded basal sinus; cor ovoid in bud, at anthesis brownish-purple, its lobe widely spreading, elliptic, 7-12 mm, two-fifths to half as wide, minutely hairy outside; corona cupulate, variable, alternate lobes short and broad or narrower, somewhat prolonged, and bifid; pollen-sacs as in spp. 4 and 5, obvious, with open slits, the pollinia ±horizontal; fr 10-16 mm, sharply muricate, not angled. Moist woods and thickets; s. U.S., n. to Del., Md., Ky., and s. Mo. June, July. (Gonolobus c.; Odontostephana c.; Vincetoxicum c.; V. hirsutum)

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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