Cal-tube campanulate to hemispheric, with short, equal, triangular lobes; standard rotund to reniform, short-clawed; wings short-clawed, obliquely oblong-obovate, obscurely auriculate; keel-pet oblanceolate, long-clawed, strongly upcurved, auriculate at base; filaments 10, diadelphous, the tube gibbous at base; fr compressed, linear, the ±numerous seeds separated by transverse partitions; herbs or shrubs with even-pinnate lvs of numerous lfls and short, bracteolate, axillary racemes of yellow fls. 50, warm reg.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.