340 NORTH AMERICAN FLORA [Volume 24 



18. Phaca Hookeriana T. & G. Fl. N. Am. 1: 693. 1838. 



Astragalus Hookcrianus A. Gray, Proc. Am. Acad. 6: 215. 1864. Not A. Hooker ianus D. Dietr. 



1850. 

 Tragacantha Hookeriana Kuntze. Rev. Gen. 945. 1891. 

 Astragalus Sonneanus Greene, Pittonia 3: 186. 1897. 



Perennial, with a deep root and short cespitose rootstock; stems numerous, 1-2.5 dm. long, 

 decumbent or ascending, more or less coarsely strigose; leaves ascending, 3-7 cm. long; stipules 

 deltoid, 3-4 mm. long; leaflets 9-17, linear to obovate, acutish toretuse, 5-15 mm. long, 2-4 mm. 

 wide, hirsute or hirsute-strigose; peduncles 2-4 cm. long; racemes short and dense, 5-12- 

 flowered; bracts subulate, 3 mm. long; calyx-tube campanulate, 4 mm. long, hirsute, the teeth 

 2 mm. long, subulate ; corolla ochroleucous, 12-13 mm. long ; banner obovate, gradually tapering 

 below; wings shorter, the blade lunate, obtuse, with a small reflexed basal auricle, half longer 

 than the claw; keel-petals similar and about as large as the wings; pod short-strigose, mottled, 

 the stipe 4—5 mm. long, the body obovoid or ellipsoid, 2.5-5 cm. long, 1.5-2 cm. wide; seeds 

 obliquely reniform, 3 mm. long, 2 mm. broad. 



Type locality: Interior of Oregon. 



Distribution: Idaho and eastern Washington to northeastern California and northern Nevada. 



Illustration: M. E. Jones, Rev. Astrag. pi. 18, f. 67. 



19. Phaca argentata Rydberg, sp. nov. 



Perennial, with a deep root and short cespitose caudex; stems many, decumbent, branched, 

 canescent, more or less purple-tinged, leaves 4—8 cm. long, ascending; stipules broadly deltoid, 

 4 mm. long; leaflets 1 1-25, obovate to oblong, 6-10 mm. long, 2-6 mm. wide, rounded or retuse 

 at the apex, silvery-white, strigose; peduncles 3-7 cm. long; racemes short, 5-7-flowered; calyx- 

 tube campanulate, 4 mm. long, silvery-strigose, the lobes subulate from a bioad base, 1.5 mm. 

 long; corolla tinged with purple, 12-14 mm. long; banner obovate, gradually tapering below; 

 wings shorter, the blade oblong-lunate, obtuse, longer than the claw, with a prominent, re- 

 curved basal auricle; keel-petals broader, rounded at the apex; pod glabrous, beautifully mot- 

 tled, the stipe 4-5 mm. long, the body obovoid, 2.5-3 cm. long, 1.5 cm. wide. 



Type collected on the west slope of Star Peak, West Humboldt Mountains, Nevada. Julv 31, 

 1912, Heller 10633 (herb. N. Y. Bot. Gard.). 

 Distribution: Western Nevada. 



20. Phaca siskiyouensis Rydberg, sp. nov. 



Perennial, with a deep root and cespitose caudex; stems several, 1-2 dm. long, decumbent, 

 more or less strigose; leaves 3-7 cm. long; stipules broadly deltoid, 3-4 mm. long, the lower 

 connate; leaflets 9-17, oblong, 7-20 mm. long, 2-4 mm. wide, strigose on both sides; peduncles 

 2-6 cm. long; racemes 5-10-flowered; calyx-tube 4 mm. long, pilose, the lobes lanceolate, about 

 1 mm. long; corolla ochroleucous, about 1 cm. long; banner obovate, tapering gradually below; 

 wings shorter, the blade oblong-lunate, obtuse, longer than the claw; keel-petals similar, but the 

 blade broader; pod glabrous, often mottled, the stipe about 4 mm. long, the body obovoid, 

 3-4 cm. long, 1.5-2.5 cm. wide. 



Type collected on Mt. Eddv, Siskiyou County. California, August 30, 1912, Alice Eastwood 2006 

 (herb. N. Y. Bot. Gard.). 



Distribution: Northern California. 



21. Phaca Whitneyi (A. Gray) A. Heller, Muhlenbergia 9: 67. 1913. 



Astragalus Whitneyi A. Gray, Proc. Am. Acad. 6: 526. 1865. 



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



Astragalus Hookerianus Whitneyi Jepson, Man. Fl. PI. Calif. 564. 1925. 



Perennial, with a very thick woody root and short branched caudex; stems numerous, 

 1-2 dm. high, decumbent, branched, strigose; leaves 4-7 cm. long; stipules lanceolate or del- 

 toid, 2-3 mm. long; leaflets 11-19, linear or linear oblong, 5-10 mm. long, 1-3 mm. wide, 

 canescent-strigose, obtuse; peduncles 3-5 cm. long; racemes short, 5-8-flowered; bracts lance- 

 olate, 2-3 mm. long; calyx-tube 3-4 mm. long, sometimes somewhat black-hairy, the lobes 



