304 NORTH AMERICAN FLORA [Volume 24 



racemes 5-8-flowered ; bracts subulate, 3-5 mm. long; calyx white- villous, the tube 9-10 mm. 

 long, about 3 mm. broad, the teeth subulate, 2 mm. long; corolla ochroleucous or slightly tinged 

 with purple; banner obovate, retuse; wings slightly shorter, the blade linear; keel-petals 

 slightly shorter than the wings, the blade short and broad, strongly arched and rounded at the 

 apex; pod 2-2.5 cm. long, 1 cm. thick, and 5 mm. wide, slightly sulcate on the upper suture, 

 rather sparingly villous, strongly incurved above the middle; seeds obliquely reniform, 3 mm. 

 long, 2 mm. broad. 



Type locality: King Hill. Elmore County, Idaho. 

 Distribution: Type locality and Malheur County. Oregon. 



36. Xylophacos utahensis (Torr.) Rydb. Bull. Torrey Club 

 40:49. 1913. 



Phaca mollissima utahensis Torr. in Stansb. Expl. Utah 385. 1852. 

 Astragalus utahensis T. & G. Pacif. R. R. Rep. 2: 120. 1854. 

 Tragacantha utahensis Kuntze, Rev. Gen. 949. 1891. 



A densely cespitose perennial, with a deep root and woody caudex; stems of the season 

 very short, 1—4 cm. long, decumbent; leaves spreading, 4—10 cm. long; stipules deltoid or 

 ovate, 5-7 mm. long, scarious, villous; leaflets 11-19, white-floccose, broadly obovate or 

 rounded-oval, 5-15 mm. long, 4—10 mm. wide, usually rounded at the apex, or the terminal 

 one slightly retuse; peduncles 5-15 cm. long, villous; bracts deltoid, hyaline, 5-7 mm. long; 

 calyx loosely villous, often purple-tinged, the tube about 1 cm. long, 4 mm. wide, the teeth about 

 4 mm. long, subulate; corolla about 2.5 cm. long, purple, in age bluish ; banner broadly obovate, 

 deeply notched ; wings much shorter, the blade lance-oblong, with a very large auricle ; keel- 

 petals still shorter, broad, with a rounded apex; pod very densely woolly, only slightly arcuate, 

 2 cm. long, 1 cm. thick, and 7-8 mm. wide. 



Type locality: Shores and island of Great Salt Lake, Utah. 



Distribution: Western Montana and western Wyoming to Utah, Nevada, and central Idaho. 



Illustrations: Stansb. Expl. Utah pi. 2; M. E. Jones, Rev. Astrag. pi. 53; pi. 54, f. 179. 



37. Xylophacos subvillosus Rydb. Bull. Torrey Club 52 : 368. 1925. 



? Astragalus infiexus ordensis Jepson, Man. Fl. PI. Calif. 573. 1925. 



A cespitose perennial, with a much branched caudex; stems 5 cm. long or less, leafy; 

 leaves 5-6 cm. long; stipules narrowly lanceolate, 5 mm. long; leaflets 9-15, obovate or oval, 

 5-12 mm. long, 3-5 mm. wide, rather sparingly white-villous, rounded at the apex; peduncles 

 2-6 cm. long; racemes 2-6-flowered ; bracts linear-attenuate, 4—5 mm. long; calyx loosely 

 villous, the tube 8-9 mm. long, 3 mm. wide, the teeth subulate, 2-3 mm. long; corolla appar- 

 ently ochroleucous, about 18 mm. long; banner rather broadly obovate, retuse ; wings shorter, 

 the blade acutish, oblong ; pod densely villous, scarcely 2 mm. long, nearly 1 cm. thick, evenly 

 arcuate throughout. 



Type locality: Sierra Valley, California. 

 Distribution: Sierra Nevada, California. 



38. Xylophacos Purshii (Dougl.) Rydb. Bull. Torrey Club 

 32:662. 1906. 



Astragalus Purshii Dougl.; Hook. Fl. Bor. Am. 1: 152. 1831. 

 Phaca mollissima Nutt.; T. & G. Fl. N. Am. 1: 350. 1838. 

 Tragacantha Purshii Kuntze, Rev. Gen. 947. 1891. 

 Astragalus lanocarpus Sheldon, Minn. Bot. Stud. 1: 144. 1894. 

 Astragalus leucocystis Greene, Ervthea 3: 76. 1895. 

 Phaca Purshii Piper, Contr. U. S. Nat. Herb. 11: 369. 1906. 

 Astragalus Purshii interior M. E. Jones, Rev. Astrag. 222. 1923. 



A subacaulescent perennial, with a cespitose woody caudex; stems less than 1 dm. long, 

 decumbent; leaves 5-8 cm. long, the petiole nearly as long as the rachis; stipules lanceolate, 

 5-7 mm. long; leaflets 7-11, ascending, lance-elliptic or rarely oval, usually acute at each end, 

 5-15 mm. long, silky-villous; peduncles 2-5 cm. long; racemes 5- 1 0-flowered ; bracts lanceolate, 



