Astragalus preussii A. Gray

Phaca preussii (A. Gray) Rydb. Bull. Torrey Club 40:47. 1913.
Astragalus Preussii A. Gray, Proc. Am. Acad. 6: 222. 1864 Tragacantha Preussii Kuntze. Rev. Gen. 947. 1891. Rydbergiella Preussii Rydb. Fl. Rocky Mts. 501. 1917.
Perennial, with a woody taproot and a short cespitose caudex; stems several, 2-5 dm. high, sulcate, glabrous, stout; leaves 7-11 cm. long, spreading; stipules large, free, broadly deltoid, 5-7 cm. long; leaflets 11-15, oblong to broadly obovate, 8-18 mm. long, glabrous, obtuse to emarginate at the apex, somewhat fleshy; peduncles ascending, 5-10 cm. long, sulcate, glabrous; racemes 4—6 cm. long; bracts lanceolate, about 2 mm. long, equaling the pedicels; flowers spreading; calyx glabrous, cylindric, the tube about 7-8 mm. long, the teeth subulate, 2-2.5 mm. long; corolla purple, about 2 cm. long; banner obovate, slightly arched, emarginate at the apex; wings much shorter, the blade oblong, shorter than the claw, with a large reflexed auricle; keel-petals about as long and similar, slightly broader and more lunate; pod glabrous, stipitate, the stipe 5-8 mm. long, the body oblong-ellipsoid, 2-3 cm. long, about 1 cm. wide and thick; seeds obliquely reniform, 4 mm. long, 2.5 mm. broad.
Type locality: Banks of Rio Virgin |Nevada|.
Distribution: Central Utah to southeastern California and central Arizona.

Jonesiella arcta (Sheldon) Rydberg
Astragalus Preussii lalus M. E. Jones, Zoe 4: 36. 1893. Astragalus Preussii arctus Sheldon, Minn. Bot. Stud. I: 130. 1894. Rydbergiella arcta Rydb. Fl. Rocky Mts. 501, 1063. 1917.
A perennial, with a woody root; stems several, 3-5 dm. high, branched, striate or sulcate, glabrous; leaves ascending, 5-15 cm. long, the rachis glabrous; stipules deltoid, 4 mm. long; leaflets 15-25, elliptic, oblong, or oblanceolate, 8-20 mm. long, 3-5 mm. wide, glabrous; peduncles 8-15 cm. long, erect; racemes 2-4 cm. long; bracts lanceolate, 2-3 mm. long; pedicels 2-4 mm. long; calyx sparingly strigose, the tube 5 mm. long, the teeth subulate, 2-3 mm. long; corolla white, similar to that of /. Pattersoni; pod distinctly stipitate, the stipe 5-6 mm. long, exceeding the calyx-tube, the body oblong-ellipsoid, acute at each end, 1.5-2 cm. long, 6 mm. wide, cross-reticulate, glabrous, the septum about 2 mm. wide.
Type locality: Green River. Utah.
Distribution: Western Colorado, southeastern Utah, and northeastern Arizona.