Sesban sonorae

Sesban sonorae Rydberg, sp. nov
Sesbania macrocarpa picla S. Wats. Proc. Am. Acad. 24: 46. 1889. Not Sesban piclus Poir. 1806. Sesban macrocarpa Standley, Contr. U. S. Nat. Herb. 22: 477. 1922.
An annual; stem 3-10 dm. high, striate, glabrous; stipules lance-subulate, 4 mm. long, caducous; leaves 5-10 cm. long; leaflets 16-20, linear-oblong, 1-2.5 cm. long, 3-6 mm. wide, glabrous, rounded or obtuse at each end or retuse at the apex; racemes 2-7 cm. long, 2-5flovvered; bracts and bractlets narrowly linear; pedicels about 5 mm. long; calyx as in the preceding; corolla about 15 mm. long, pale-yellow, the banner usually purple-streaked and purple-dotted; blades of the wings broadly obliquely oblanceolate, with a triangular basal auricle; those of the keel-petals with a small tooth-like basal auricle; pod 10-15 cm. long, 3 mm. wide, 15-20-seeded; seeds 4 mm. long, 2 mm. high.
Type locality: Guaymas, Sonora.
Distribution: Arizona, southern California, Sonora, Sinaloa, and Lower California.