Part 5, 1929] FABACEAE: GALEGEAE 269 



31. Homalobus decumbens Nutt.; T. & G. Fl. N. Am. 

 1:351. 1838. 



Astragalus decumbens A. Gray. Proc. Am. Acad. 6: 229. 1864. 

 TragacatUha decumbens Kuntze. Rev. Gen. 944. 1891. 

 Phaca decumbens Piper. Contr. U. S. Nat. Herb. 11: 373. 1906. 

 Astragalus campestris decumbens M. E. Jones, Rev. Astrag. 74. 1923. 



A perennial, with a rootstock, branched near the surface; stems 1-2 dm. long, decumbent, 

 striate, sparingly strigose; upper stipules lanceolate, the lower triangular, connate, scarious, 

 2-4 mm. long; leaves 4-9 cm. long; leaflets 7-17, linear or narrowly lance-linear, 5-10 mm. 

 long, mostly I mm. wide, often conduplicate, sparingly strigose; peduncles 6-S cm. long; 

 racemes short, 5-10-flowered; bracts subulate, 2 mm. long; calyx strigose, the tube 2 mm. 

 long, the teeth subulate, less than 1 mm. long; corolla white or cream-colored, with a purple- 

 tipped keel; banner broadly obovate, nearly 1 cm. long, strongly arched below the middle; 

 wings S mm. long, the blade oblong, falcate; keel-petals shorter, the blade lunate; pod linear, 

 arcuate, 2.5 cm. long, 3 mm. wide, strigose, acute at each end. 



Type locality: Sandy plains of the Colorado of the West, near the sources of the Platte 

 [Green River Basin, Wyoming). 



Distribution: Wyoming and Colorado. 



32. Homalobus divergens (Blankinship) Rydb. Bull. 

 Torrey Club 34: 417. 1907. 



Astragalus divergens Blankinship. Mont. Agr. Coll. Stud. 1: 73. 1905. 

 Homalobus camporum Rydb. Bull. Torrey Club 32: 666. 1906. 

 Astragalus campestris crispatus M. E. Jones, Rev. Astrag. 75. 1923. 



A perennial, with a cespitose caudex; stems 1-1.5 dm. high, strigose-canescent ; leaves 3-5 

 em. long; stipules triangular, acuminate, 3-5 mm. long, pubescent, the lower connate; leaflets 

 9-13, elliptic to linear-oblong, 4—10 mm. long, 1-2 mm. wide, strigose-canescent on both sides; 

 peduncles 5-8 cm. long; racemes short, 6-15-flowered; bracts subulate, 2 mm. long; calyx stri- 

 gose with mixed dark and light hairs, the tube 2 mm. long, the teeth lance-subulate, 1 mm. 

 long; corolla ochroleucous or white, tinged with blue, the keel purple-tipped; banner 7-8 mm. 

 long, obovate; wings 6 mm. long, the blade obliquely oblaneeolate, falcate; keel-petals 6-7 

 mm. long, lunate, with alanceolate, obtusish tip; pod 12-1S mm. long, 2-2.5 mm. wide, strigose, 

 straight, somewhat mottled with light-brown, sessile or short-stipitate ; seeds 2 mm. long, 1.5 

 mm. wide. 



Type locality': Uplands near Big Coulee, about 30 miles northeast of Big Timber, Sweet Grass 

 County, Montana. 



Distribution: Montana. Wyoming, eastern Idaho, and northeastern Utah. 

 Illustration: Mont. Agr. Coll. Stud. 1: pi. 2. 



33. 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. 



Illustrations: M. E. Jones. Contr. W. Bot. 10: pi. 2 (as .4. tenuifolius, in part, as to lower pod); 

 Rev. Astrag. pi. 2, f. b. 



