Thurber's Diphysa

Diphysa thurberi (A. Gray) Rydb.; Standley, Contr. U. S Nat. Herb. 23: 479. 1922.
Daubcnlonia ? Thurberi A. Gray. Mem. Am. Acad. II. 5: 313. 1S54. Ormocarpum Thurberi Benth. & Hook.; Hemsl. Biol. Centr. Am. Bot. 1: 270. 1880. Emerus Thurberi Kuntze, Rev. Gen. 181. 1891. Solulus Thurberi Kuntze, Rev. Gen. 205. 1891.
A shrub, 3-6 dm. high ; branches densely glandular-hirsute ; stipules lanceolate, acuminate, deciduous, 5 mm. long; leaves about 1 dm. long; rachis densely glandular-hirsutulous; leaflets 19-25, oval or obovate, 6-10 mm. long, 4—6 mm. wide, glabrous on both sides, with dark veins, glandular-ciliolate on the margins; racemes 4—6 cm. long, 4—7-flowered; peduncle and pedicels glandular-hirsute; bracts oblong, 2 mm. long; pedicels 7-8 mm. long; bractlets elliptic or obovate, 2 mm. long, glandular-ciliolate; calyx campanulate with an obconic base (hypanthium), glabrous; tube (including the hypanthium) 5-6 mm. long; lobes lanceolate, 2 mm. long, acute or obtuse; corolla yellowish, 1 cm. long; banner rounded-obovate, emarginate, almost clawless; wings short-clawed, the blades obliquely oblanceolate, with a rounded apex and a rounded basal auricle; keel-petals similar but broader, united above the middle, with the acutish tips free; ovary stipitate, densely pubescent; pod linear, 6-S cm. long, 1 cm. broad, tapering at each end, somewhat tomentose, muricate.
Type locality: Mabibi, Ronora.
Distribution: Sonora, southern Arizona, and western Chihuahua.

Diphysa echinata Rose, Contr. U. S. Nat. Herb 12: 271. 1909.
A low shrub; young branches hirsute-strigose and usually with yellowish bristles which develop into weak prickles; stipules lance-linear, 5-7 mm. long; leaves 5-10 cm. long; rachis sparingly hirsute in age, glabrate; leaflets 9-13, oval to suborbicular, 1.5-2 cm. long, very thin, glabrous above, pale and puberulent or glabrate beneath; racemes 5-7 cm. long; peduncle and pedicels hispid-prickly, the latter 1-2 cm. long; bracts linear, 5-7 mm. long; calyx glabrous, the tube 6 mm. long; upper two lobes broadly ovate, rounded at the apex, ciliolate on the margins, the lateral ones similar but narrower, the lowest one lanceolate, 4 mm. long.
Type locality: Between Rosario and Colomas, Sinaloa. Distribution; Known only from the type locality.

Perennial, Shrubs, Woody throughout, Nodules present, Stems erect or ascending, Stems or branches arching, spreading or decumbent, Stems 1-2 m tall, Stems greater than 2 m tall, Plants gland-dotted or with gland-tipped hairs, Stems solid, Stems or young twigs sparsely to densely hairy, Stem hairs hispid to villous, Leaves alternate, Leaves petiolate, Stipules conspicuous, Stipules green, triangulate to lanceolate or foliaceous, Stipules deciduous, Stipules free, Leaves compound, Leaves odd pinnate, Leaf or leaflet margins entire, Leaflets opposite, Leaflets 10-many, Leaves glabrous or nearly so, Leaves hairy on one or both surfaces, Inflorescences racemes, Inflorescence axillary, Inflorescence or flowers lax, declined or pendulous, Bracts very small, absent or caducous, Bracteoles present, Flowers zygomorphic, Calyx 5-lobed, Calyx glabrous, Calyx hairy, Petals separate, Corolla papilionaceous, Petals clawed, Petals orange or yellow, Banner petal suborbicular, broadly rounded, Banner petal auriculate, Wing petals narrow, oblanceolate to oblong, Wing tips obtuse or rounded, Stamens 9-10, Stamens diadelphous, 9 united, 1 free, Filaments glabrous, Style terete, Fruit a legume, Fruit stipitate, Fruit indehiscent, Fruit elongate, straight, Fruit oblong or ellipsoidal, Fruit exserted from calyx, Fruit inflated or turgid, Fruit compressed between seeds, Fruit hairy, Fruit 3-10 seeded, Seeds ovoid to rounded in outline, Seed surface smooth, Seeds olive, brown, or black.