Timber Milkvetch

Homalobus oblongifolius Rydb. Bull. Torrey Club 34: 50. 1907
Astragalus hylophilus oblongifolius F. Macbr. Contr. Gray Herb. 65: 37. 1922.
A perennial, with a rootstoek and cespitose caudex; stem ascending, branched, 2-3 dm. high, sparingly strigose or glabrate; leaves 8-10 cm. long; stipules ovate or lanceolate, scarious, the lower connate; leaflets 11-19, from elliptic to linear-oblong, usually oblong, 1-2 cm. long, 3-6 mm. wide, glabrous above, sparingly strigose beneath, rounded at the apex; peduncles 5-10 cm. long; racemes short, 3-5 cm. long, 5-10-flowered; bracts lanceolate, scarious, 1 mm. long; calyx strigose with black hairs, the tube 2-2.5 mm. long, the teeth subulate, fully
1 mm. long; corolla white, tinged with purple, the keel purple-tipped; banner 1 cm. long, obovate, retuse; wings and keel-petals 8 mm. long, similar to those of //. hylophilus; pod about
2 cm. long, 3 mm. wide, usually broadest above the middle, acute, the tip slightly curved upwards; seeds oblong.
Type locality: Cerro Summit, Colorado. Distribution: Colorado.

Homalobus hitchcockii Rydberg, sp. now
A cespitose perennial; stems several, about 2 dm. high, branched at the base, sparingly strigose; leaves erect, 10-13 cm. long, the rachis sulcate, sparingly strigose; stipules broadly deltoid, acuminate; leaflets 9-15, lanceolate or lance-oblong, acute at each end, 1-2.5 cm. long, 2-5 cm. wide, glabrous above, strigulose beneath; peduncles 10-12 cm. long, erect; racemes about 2 cm. long, few-flowered; bracts lance-subulate, 2 mm. long, slightly exceeding the pedicels; calyx sparingly black-hairy, the tube 2-2.5 mm. long, the teeth subulate, 1.5 mm. long; corolla cream-colored, the keel purple-veined and purple-tipped; banner about 9 mm. long, obovate, strongly arcuate below the middle; wings 7 mm. long, the blade oblanceolatefalcate; keel-petals 6 mm. long, the blade lunate, long-acute at the apex; pod oblanceolate in outline, slightly arched, broadest one third from the apex, minutely black-strigulose, the lower suture strongly arched.
Type collected at Duck Creek, Eli. Nevada, August 17, 1913, Hitchcock 1344 (U. S. Nat. Herb, no. 766659)

Homalobus decurrens Rydb. Bull. Torrey Club 31: 563. 1904
Astragalus Rydbergii F. Macbr. Contr. Gray Herb. 65: 37. 1922.
A perennial, with a cespitose rootstoek or caudex; stems erect, 3-4 dm. high, slightly strigose and angled; leaves 1-1.5 dm. long; upper stipules lanceolate, free, 4-5 mm. long, green, the lower ones scarious, broader, and connate; leaflets 11-15, linear-oblong or oblanceolate, glabrate above, strigose beneath, the terminal one usually larger, more or less decurrent on the rachis, without a distinct node, 2-5 cm. long, 3-6 mm. wide, the lateral ones 1.5-4 cm. long, all mucronate or cuspidate; racemes slender, lax, including the peduncle 1-2 dm. long, 5-10flowered; bracts subulate, about 2 mm. long; calyx more or less black-hairy, the tube about 2.5 mm. long, the teeth subulate, nearly 2 mm. long; corolla white, the keel tipped with purple; banner obovate, retuse, 10-12 mm. long; wings and keel-petals 9-10 mm. long, the blade of the former obliquely oblanceolate, falcate, with an acute basal auricle, twice as long as the claw; blade of the keel-petals lunate, with a lanceolate tip; pod fully 2 cm. long and 3 mm. wide, sessile, linear, straight, glabrous or sparingly white-strigose when young; seeds oblong-reniform, fully 2 mm. long and 1.5 mm. broad.
Type locality: Estes Park, Colorado. Distribution: Colorado.

Homalobus humilis Rydb. Bull. Torrey Club 34: 417. 1907
Astragalus Carltonii F. Macbr. Contr. Gray Herb. 65: 36. 1922.
A perennial, with a cespitose caudex; stem 2-10 cm., rarely 15 cm. high, grayish-strigose, decumbent or spreading; leaves 2-7 cm. long; stipules ovate or triangular, scarious, 2-3 mm. long, the lower connate; leaflets 11-17, oblong to linear, 3-10 mm. long, usually 2-3 mm. wide, grayish-strigose beneath, glabrous above; peduncles 2-8 cm. long; racemes short, 1-2 cm. long, 3-S-flowered; calyx strigose with black hairs, the tube 1.5-2 mm. long, the teeth triangular or triangular-subulate, 1-1.5 mm. long; corolla white, tinged with purple, and the keel purple-tipped; banner obovate, 7-S mm. long; wings and keel-petals 6-7 mm. long, similar to those of H. microcarpus; pod about 1.5 cm. long, 3 mm. wide, widest near the abruptly acute apex, tapering towards the base, the upper suture nearly straight, the lower arched at the apex; seeds broadly oblong-reniform.
Type locality: Mountains north of Bullion Creek, near Marysvale, Utah. Distribution: South-central Utah.

Homalobus microcarpus Rydb. Bull. Torrey Club 34:417. 1907.
Homalobus camporum Rydb. Bull. Torrey Club 32: 666, in part. 1906.
A perennial, with a cespitose rootstoek, branching near the surface; stem decumbent, 1-2 dm. high, strigose; leaves numerous, 5-8 cm. long; stipules scarious, ovate, 2-3 mm. long; leaflets 9-15, elliptic to linear, 5-15 mm. long, 1-3 mm. wide, glabrous above, sparingly strigose beneath, obtuse or acutish; peduncles 4—6 cm. long; racemes short, 3-8-flowered; calyx strigose with black hairs, the tube about 2 mm. long, the teeth about 1 mm. long, subulate; corolla white, the keel tipped with purple; banner broadly obovate, S mm. long; wings and keel-petals 6 mm. long, similar to those of H. hylophilus; pod sessile, strigose, straight, 12-18 mm. long, nearly 3 mm. wide; seeds oblong-reniform, 2 mm. long.
Type locality: East slope of Rabbit Ear Range, Colorado. Distribution: Northern Colorado, southern Wyoming and Utah.