Cal-tube hemispheric, slightly oblique, 4-lobed by fusion of the 2 uppermost; upper lobe broadly triangular, barely emarginate; lower 3 lobes lance-triangular; standard oblate, broader than long, with 2 prominent keel-like appendages at the base within; wings long-clawed, the obovate blade upcurved; keel-pet narrowly oblong, bent upward at the middle at about a right angle; stamens 10, diadelphous; style bearded along the upper side; fr oblong, flat, few-seeded; herbs with large, 3-foliolate lvs and axillary racemes of medium sized, anthocyanic (white) fls. 60, Old World.
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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