Cal-tube hemispheric to campanulate, bilabiate; cal-lobes unequal, the 2 upper short or completely connate, the lowest one often elongate; standard reflexed, rotund, with 2 basal callosities; wings obliquely obovate, clawed, auriculate at base of the blade; keel up curved, auriculate at base; stamens 10, diadelphous; fr linear, flattened, dehiscent, many-seeded; woody twining vines with odd-pinnate lvs and handsome blue fls in large racemes at the end of short branches, appearing before the lvs are fully expanded. (Kraunhia) 6, e. Asia, e. N. Amer.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.