287 Didymocarpi. | 
Mexico, Sept. 16, 1903, by J. N. Rose, Nat. Herb. No. 450662. 
273. Astragalus Brazoensis Buckley Proc. Phil. Acad. 452 
(1861). Pods about reniform, 4 mm. long, 5 mm. wide and 2 mm. 
high, cuspidate with upturned sharp prickle, much obcompressed, 
reflexed on a stipe as long as calyx, finely cross-nerved, smooth and 
shining. Flowers purple, about 5 mm. long, in a loose head. Banner 
4 mm. long, oblong, arched to erect and abruptly at end of calyx 
tube, with sides reflexed about 1 mm. wide below. Wings oblong, 
a little arched, with the upper side white and the lower side pur- 
ple from base to tip, a little longer than keel and 2 mm. shorter 
than banner. Keel 4 mm. long, with straight base and front of tip 
straight and erect, triangular, acute, purple, 3 mm. high. Calyx 
tube campanulate, about 1 mm. long, acute at base, with rounded 
sinuses, the subulate teeth about as long and straight. Pedicels 
about 1 mm. long and equaling the ovate bracts. Peduncles about 
3-5 cm. long. Leaves 3-5 cm. long, short-petioled. Leaflets 6-7 
pairs, oblong-obovate, about 5 mm. long, notched, short-petiolulate, 
pubescent only on the margins and midrib with slender hairs. In- 
ternodes shorter than the leaves. Outer stems decumbent below, 
flexuous, sulcate. ‘Stipules triangular, green, 3 mm. long. Com- 
mon on Texan prairies from the center of the state to the sea. 
