Twogrooved Milkvetch

Diholcos micranthus Rydb. Fl. Rocky Mts. 500. 1917
A perennial, with a woody root; stems several, erect or ascending, sparingly strigose, 2-4 dm. high; leaves 5-7 cm. long; stipules deltoid, 4 mm. long; leaflets 17-25, linear to lanceoblong, acute at each end, 7-20 mm. long, 2-4 mm. wide, glabrous above, strigose beneath; peduncles 5-7 cm. long; racemes many-flowered, 5-7 cm. long; bracts lance-subulate, 4 mm. long; pedicels 2-3 mm. long, recurved; calyx strigose, the tube 2-2.5 mm. long, the teeth subulate-filiform, 1-1.5 mm. long, the upper shorter; corolla 6-7 mm. long, cream-colored; pod strigose, the stipe 3-4 mm. long, the body about 8 mm. long, acute at each end, scarcely 2 mm. wide and 3 mm. thick; seeds obliquely reniform, 3 mm. long, dark-brown.
Type locality: [La Veta.J Colorado. Distribution: Colorado.

Diholcos bisulcatus (Hook.) Rydb. Bull. Torrey Club
32:664. 1906.
Phaca hisulcala Hook. Fl. Bor. Am. 1: 145. 1831.
Astragalus bisulcatus A. Gray, Pacif. R. R. Rep. 12: 42. 1860.
Tragacantha bisulcata Kuntze. Rev. Gen. 943. 1891.
Astragalus bisulcatus hedysarifomis Gand. Bull. Soc. Bot. Fr. 48: xiv. 1902.
A perennial, with a thick woody root; stems several from the short caudex, 3-10 dm. high sulcate, more or less strigose; leaves ascending, 6-10 cm. long; stipules deltoid, acute or acuminate, 4-6 mm. long; leaflets 15-25, oblong to oval, 1-2.5 cm. long, 3-10 mm. wide, firm; peduncles 7-15 cm. long; racemes many-flowered, 5-10 cm. long; bracts lance-subulate, 4-6 mm. long; flowers drooping; pedicels 2-3 mm. long; calyx strigose, the tube about 4 mm. long and 3 mm. broad, the teeth subulate, 2-3 mm. long; corolla purple or rarely white, 12-15 mm. long; banner obovate, moderately arched at the middle; wings nearly as long, the blade oblong, with a long, recurved auricle; keel-petals a little shorter, the blade broadly obliquely lunate, more curved towards the rounded apex, with a rather large auricle; pod strigose, the stipe 3-4 mm. long, the body 12-15 mm. long; seeds dark-brown or black, reniform, 4 mm. long, 2 mm. wide.
Type locality: Plains of the Saskatchewan, Canada.
Distribution: Manitoba to Nebraska. Colorado, Idaho, and Alberta.