Diphysa suberosa S. Watson

Diphysa suberosa S. Wats. Proc. Am. Acad. 22: 405. 1887
A low shrub, 1-3 m. high; branches glabrous, often short and somewhat spinescent, the trunk with corky bark; stipules lance-subulate, falcate, about 5 mm. long; leaves 3-10 cm. long; rachis glabrous; leaflets 7—11, subalternate, oval or oblong-obovate, acute or obtuse, apiculate, 4-15 mm. long, fifm, glabrous, prominently veined beneath; racemes 2-4 cm. long, 1-3-flowered; bracts lanceolate, 1-2 mm. long, caducous; bractlets ovate, 5-6 mm. long, acute or short-acuminate, more persistent; calyx glabrous, the tube (including the hypanthium) 7-8 mm. long; uppermost two lobes broadly ovate, rounded at the apex, 3 mm. long, the lateral ones ovate, acute, the lowest one lanceolate, acuminate; pod 5-6 cm. long, about 1 cm. broad, round-carinate on the backs of the valves; seeds light-brown, 6 mm. long, 2 mm. wide.
Type locality: Barranca near Guadalajara, Jalisco. Distribution: Sonora to Morelos and Oaxaca.