Diphysa microphylla Rydb.

Diphysa microphylla Rydberg, sp. nov
A low shrub; branches short, often spinescent, strigose-puberulent with ascending hairs; stipules subulate, 3 mm. long; leaves 2-3 cm. long; rachis sparingly strigose, sometimes with minute prickles; leaflets 13-17, oblong, 2-6 mm. long, glabrous or somewhat short-pilose; racemes 1-2 cm. long, 1or 2-flowered; bracts lanceolate, 1-2 mm. long; bractlets oblanceolate, obtuse; pedicels 6-8 mm. long; calyx glabrous, the tube (including the hypanthium) 5 mm. long; uppermost two lobes rounded-ovate, obtuse, the lateral ones lanceolate, acute, the lowest one lanceolate, acuminate; corolla pale-yellow, 1 cm. long; pod puberulent when young, 4—6 cm. long, 12-15 cm. broad; stipe 1 cm. long; seeds 4.5 mm. long, 3 mm. wide.
Type collected in the vicinity of Victoria, Tamaulipas, February 1 to April 9, 1907, Edward Palmer 367 (herb. N. Y. Bot. Card.).
Distribution: Tamaulipas and Nuevo Le6n.