574 FABACEAE 



cm. long; leaflets 11-25, oblong-obovate to oblanceolate, 5-10 mm. long, 2-5 mm. wide, glabrous 

 above, sparingly short-pubescent beneath, often only on the margins and midrib ; peduncles S-10 

 cm. long ; racemes 3-5 cm. long ; calyx villous, the tube 8 mm. long, gibbous on the upper side, 

 the two upper teeth triangular, the three lower lanceolate, 0.5 mm. long; corolla ochroleucous, 

 14 mm. long; pod arcuate, 12-18 mm. long, 3 mm. wide, sparingly short-pubescent; stipe 8-10 

 mm. long. 



Upper Sonoran Zone; northeastern Oregon. Type locality: John Day River, Oregon. May-June. 



Astragulus Laurentii (Rydb.) M. E. Peck, Man. PI. Oregon 443. 1941. This is apparently only a form of 

 Astragalus subglaber with the body of the pod villous, slightly curved and 10-15 mm. long. Known only from 

 the type locality, Heppner, Morrow County, Oregon. 



18. Astragalus speirocarpus A. Gray. Spiral-pod Rattle-weed. Fig. 2792. 



Astragalus speirocarpus A. Gray, Proc. Amer. Acad. 6: 225. 1864. 

 Phaca speirocarpus Piper, Contr. U.S. Nat. Herb. 11: 370. 1906. 

 Homalobus speirocarpus Rydb. Bull. Torrey Club 51: 18. 1924. 



Perennial, the stems much branched from a slender root, flexuous, 2-3 dm. high, rarely more, 

 the whole plant grayish-strigose. Leaves 5-7 cm. long ; leaflets 9-17, oblong-cuneate to oblong- 

 obovate, retuse, 5-12 mm. long ; peduncles 4-5 cm. long, shorter than the leaves, nearly equaled by 

 the racemes ; flowers spreading ; calyx-tube 6-7 mm. long, gibbous at base, the teeth broadly tri- 

 angular, scarcely 1 mm. long ; corolla ochroleucous, 15 mm. long, the banner well exceeding the 

 keel ; pods spirally coiled, 3-4 mm. broad, acuminate at apex, gradually narrowed below to a stout 

 stipe, firm, strigose, reticulate. 



Dry plains, Upper Sonoran Zone; Yakima and Klickitat Counties, eastern Washington, to Klamath and 

 Lake Counties, eastern Oregon. Type locality: Wenas, Yakima County, Washington. May-June. 



19. Astragalus alvordensis M. E. Jones. Alvord Rattle-weed. Fig. 2793. 



Astragalus alvordensis M. E. Jones, Contr. West. Bot. No. 10: 67. 1902. 

 Homalobus alvordensis Rydb. Bull. Torrey Club 51 : 18. 1924. 



Perennial, the stems slender, ascending, much branched, 3-5 dm. high. Leaves 2-4 cm. long ; 

 leaflets 13-17, approximate, obovate-cuneate. retuse, 4-6 mm. long, thick, short-pubescent; pe- 

 duncles slender, 1-2 cm. long ; racemes 3-8-flowered ; flowers widely spreading ; calyx-tube tur- 

 binate-campanulate, about 2 mm. long, obliquely inverted at the base, the teeth triangular, 

 minute ; corolla 7 mm. long, purple-veined ; pod about 2 cm. long, 3 mm. high, flattened, spirally 

 coiled into one or one and one-half coils, firm-coriaceous and pubescent, long-acuminate at apex, 

 narrowed to a slender stipe, about 1 cm. long. 



Dry plains and hillsides, Upper Sonoran Zone; known only from Alvord Valley, eastern Oregon. June. 



20. Astragalus sclerocarpus A. Gray. Woody-pod Rattle-weed. Fig. 2794. 



Phaca podocarpa Hook. Fl. Bor. Amer. 1: 142. 1831. Not Astragalus podocarpus C. A. Mey. 1831. 

 Astragalus sclerocarpus A. Gray, Proc. Amer. Acad. 6: 225. 1864. 

 Homalobus podocarpus Rydb. Bull. Torrey Club 51: 18. 1924. 



Perennial, the stems several from the crown of a woody root, rather widely branching, 3-5 

 dm. high, strigose, but scarcely canescent. Leaves rather sparse, 6-8 cm. long; leaflets 7-14, 

 distant, narrowly linear, 8-15 mm. long, strigose; peduncles 6-8 cm. long; racemes 3-5 cm. long; 

 calyx-tube 6 mm. long, black-hairy, the teeth 1 mm. long; corolla 10 mm. long, white tinged with 

 purple ; pods including the stipe 4-5 cm. long, curved only slightly to about one-third of a circle, 

 long-acuminate at apex and tapering at base to the stipe, coriaceous, flat when young, oval in 

 cross-section when mature, reticulate, strigose, dehiscent from the base. 



Dry plains, especially in sand, Upper Sonoran Zone; eastern Washington and eastern Oregon, from Ellens- 

 burg to the Malheur River. Type locality: Great Falls of the Columbia River. April-May. 



21. Astragalus bicristatus A. Gray. Crested Rattle-weed. Fig. 2795. 



Astragalus bicristatus A. Gray, Proc. Amer. Acad. 19: 75. 1883. 

 Homalobus bicristatus Rydb. Bull. Torrey Club 51: 19. 1924. 



Perennial, the stems much branched, 3-5 dm. high, green and nearly glabrous or more or 

 less cinereous-strigose. Leaves 6-8 cm. long; leaflets 11-15, linear to oblong, 8-20 mm. long, 

 green or more or less cinereous ; peduncles exceeding the leaves ; racemes 4-5 cm. long ; calyx- 

 tube 7 mm. long, the teeth subulate, 3 mm. long; corolla ochroleucous or tinged with purple, 

 12 mm. long ; body of the pod 15-20 mm. long, curved often to one-third circle, rather abruptly 

 narrowed to a prominent beak at apex, glabrous, somewhat obcompressed, broader than deep, the 

 dorsal suture more or less winged; stipe 8-10 mm. long. 



Open pine forests and desert slopes, Arid Transition and Upper Sonoran Zones; San Gabriel and San Ber- 

 nardino Mountains, southern California. Type locality: Holcomb Valley, San Bernardino Mountains. May-June. 



22. Astragalus reventus A. Gray. Revenant Locoweed. Fig. 2796. 



Astragalus reventus A. Gray, Proc. Amer. Acad. 15: 46. 1879. 

 Phaca reventa Piper, Contr. U.S. Nat. Herb. 11: 372. 1906. 

 Cnemidophacos reventus Rydb. Bull. Torrey Club 40: 52. 1913. 

 Cnemidophacos reventiformis Rydb. N. Amer. Fl. 24: 284. 1929. 



Stems erect, 2-4 dm. high, numerous, sparingly strigose. Leaflets 21-37, oblong to linear, 

 10-15 mm. long, cinereous-strigose on both surfaces or glabrate above ; peduncles erect, often 

 2 dm. long in fruit ; racemes 3-5 cm. long ; calyx black-hairy, the tube 7-8 mm. long, the teeth 



