Astragalus brazoensis Buckl.

Hesperastragalus brazoensis (Buckl.) Rydb. Bull. Torrey
Club 53: 166. 1926.
Astragalus brazoensis Buckl. Proc. Acad. Phila. 1861: 452. 1862. Tragacantha brazoensis Kuntze, Rev. Gen. 943. 1891.
An annual; stem branched at the base, erect, or decumbent at the base, 1-4 dm. high, sparingly strigose, striate; leaves ascending, 3-6 cm. long, the rachis sparingly strigose; stipules deltoid 3 mm. long; leaflets 13-15, cuneate or oblong-obovate, retuse at the apex, 5-10 mm. long glabrous above, sparingly strigose beneath, often only on the margins and midribs; peduncles 5-8 cm. long, ascending; racemes 1-4 cm. long; bracts lance-subulate, 1-2 mm. longcalyx sparingly strigose, the tube campanulate, 1.5 mm. long, the teeth subulate, 2 mm. long' corolla purplish or white, with purple-tipped keel; banner broadly obovate, slightly retuse abruptly arcuate at the middle; wings shorter, the blade obliquely oblong-oblanceolate, falcatekeel-petals slightly shorter, the blade semi-orbicular, obtuse at the tip; pod distinctly stipitate, cross-reticulate, 5-7 mm. long and as thick, 4 mm. wide, deeply sulcate on the lower suture, the dorsi-ventral view suborbicular, subcordate at the base and abruptly beaked at the apex; seeds 2 or 3 in each cavity.
Type locality: Western Texas.
Distribution: Texas and Tamaulipas.