Timber Milkvetch

Homalobus palliseri (A. Gray) Rydb. Mem. N. Y. Bot Gard. 1: 248. 1900.
Astragalus Palliseri A. Gray, Proc Am. Acad. 6: 227. 1864.
Tragacantha Palliseri Kuntze, Rev. Gen. 947. 1891.
Astragalus serotinus Palliseri F. Macbr. Contr. Gray Herb. 65: 37. 1922.
A perennial, with a cespitose rootstock, branched near the surface; stem 2-3 dm. high, slender, sparingly strigose; leaves 5-10 cm. long, ascending; upper stipules lanceolate, green, nearly distinct, the lower scarious, triangular, more or less connate ; leaflets 9-19, linear or lancelinear, 1-2 cm. long, 1-2 mm., rarely 3 mm. wide, glabrous above, strigose beneath, obtuse or acutish; racemes lax, 7-15-flowered, including the peduncle 1-2 dm. long; bracts lanceolate, about 2 mm. long; calyx strigose with mixed white and dark hairs, the tube 2-2.5 mm. long, the teeth subulate, less than 1 mm. long, often only 0.5 mm. long; corolla white, only the keel purple-tipped; banner obovate, 8 mm. long; blades of the wings obliquely lunate-oblanceolate, 6 mm. long, those of the keel-petals lunate, with a lanceolate obtuse tip and a rounded basal auricle; pod sessile or slightly stipitate, 15-20 mm. long, 2-2.5 mm. wide, glabrous; seeds olivebrown, oblong, 2 mm. long, 1.5 mm. wide.
Type locality: Rocky Mountains on the British Boundary. Distribution: Montana, Alberta, British Columbia, and Washington.

Homalobus serotinus (A. Gray) Rydb. Mem. N. Y. Bot Gard. 1: 248. 1900.
Astragalus serotinus A. Gray, Pacif. R. R. Rep. 12: 51. 1860. Tragacantha serotina Kuntze, Rev. Gen. 948. 1891.
Astragalus decumbens serotinus M. E. Jones, Contr. W. Bot. 10: 58. 1902. Phaca serotina Piper, Contr. U. S. Nat. Herb. 11: 374. 1906. Astragalus campestris serotinus M. E. Jones, Rev. Astrag. 75. 1923.
A perennial, with a branched rootstock; stem adsurgent or erect, sparingly strigose, in age often glabrate; leaves 7-15 cm. long, ascending; upper stipules lanceolate, green, 2-3 mm. long, the lower scarious, triangular, connate; leaflets 9-21, linear, glabrous above, strigose beneath, 1-2.5 cm. long, 1-3 mm. wide; racemes lax, with the peduncle 1-1.5 dm. long, S-20flowered; bracts lanceolate, 2 mm. long; calyx white-hairy, the tube 2-2.5 mm. long, the teeth subulate, less than 1 mm., often only 0.5 mm. long; corolla white, the keel tipped with purple; banner obovate, retuse, 8-9 mm. long; wings 7 mm. long, the blade obliquely oblanceolate, slightly longer than the claw; keel-petals similar, but broader, with a lanceolate tip and a rounded basal auricle; pod strigose, linear, about 2 cm. long, 3 mm. wide, acute at each end, sessile; seeds oblong, 2 mm. long, brown.
Type locality : Near Columbia River, lat. 48°, Washington.
Distribution: Alberta and British Columbia to Oregon and western Montana; Colorado (?).