598 FABACEAE 



98. Astragalus nigricalycis (M. E. Jones) Abrams. Black Locoweed. Fig. 2872. 



Astragalus lentiginosus var. nigricalycis M. E. Jones, Proc. Calif. Acad. II. 5: 674. 1895. 

 Cystium nigricalyce Rydb. N. Amer. Fl. 24: 408. 1929. 



Perennial from a woody root, the stems several from the crown, decumbent, 2-5 dm. long, 

 more or less densely short-tomentose. Leaves ascending or somewhat spreading 6^8 cm. long ; 

 leaflets 15-23 obovate, often rather narrowly so, rounded or obtuse at apex, 6-12 mm. long, 

 mostly glabrous above, loosely pubescent or tomentose beneath; peduncles 4-8 cm. long; racemes 

 2-5 cm long, rather densely flowered, the tube cylindric, 4 mm. long, black-hairy, the teeth 

 triangular-subulate, scarcely over 1 mm. in length ; corolla 12 mm. long, ochroleucous or tinged 

 with rose-purple; pods broadly ovoid, 15-20 mm. long, 10-12 mm. wide and as thick, mottled and 

 rather densely pubescent with spreading hairs, the beak 3-5 mm. long, somewhat curved upward. 



Sandy plains, Lower Sonoran Zone; abundant in the upper San Joaquin Valley, California. Type locality: 

 Bakersfield, Kern County, California. Feb.-April. 



99. Astragalus tehachapiensis (Rydb.) Tidestrom. Tehachapi Locoweed. 



Fig. 2873. 



Cystium tehatchapiense Rydb. N. Amer. Fl. 24: 414. 1929. 



Astragalus tehachapiensis Tidestrom, Proc. Biol. Soc. Wash. 50: 21. 1937. 



Perennial from a woody rootstock, the stems 3-4 dm. long, ascending, rather stout and flexu- 

 ous glabrous or nearly so, stipules triangular-lanceolate, mainly membranous, about 4 mm. long, 

 spreading or reflexed. Leaves 5-7 cm. long; leaflets 15-19, broadly obovate, retuse /-15 mm. 

 long, bright green, glabrous above, very sparsely strigose beneath ; peduncles stout 3-5 cm. long ; 

 racemes about 2 cm. long, densely flowered; calyx-tube narrowly campanulate, 4-5 mm. long, 

 sparsely black-hairy, the teeth triangular-subulate, scarcely 1 mm. long; corolla ochroleucous, 

 tipped with purple, 12 mm. long; pod much inflated, obliquely ovoid, about 2.5 cm. long and 

 1.5 cm. thick, abruptly narrowed to a prominent upcurved beak, papery, mottled, glabrous. 



Fields and gentle slopes. Upper Sonoran Zone; Tehachapi Mountains, California. Type locality: fields near 

 Tehachapi, California. April-May. 



100. Astragalus albifolius (M. E. Jones) Abrams. White-leaved Locoweed. 



Fig. 2874. 



Astragalus lentiginosus var. albifolius M. E. Jones, Rev. N. Amer. Astrag. 124. 1923. 

 Cystium albifolium Rydb. N. Amer. Fl. 24: 413. 1929. 



Perennial, stems several, widely spreading and prostrate, 3-7 mm. long, slender, strigose. 

 Leaves 4-6 cm. long, divergent or reflexed, sessile or nearly so; leaflets 11-15, oblong to elliptic, 

 10-15 mm. long, pallid and more or less hoary-strigose ; peduncles 1.5-4 cm. long, divergent or 

 ascending ; racemes rather densely-flowered, in fruit 2-4 cm. long and the pods crowded ; calyx- 

 teeth cylindric, 3 mm. long, silky, the teeth subulate, about 2 mm. long; corolla 8-10 mm. long, 

 ochroleucous or tinged with pink ;_ pods subglobose, papery, about 1 cm. long, the beak 2-3 mm 

 long or reduced to a mere apiculation. 



Alkaline plains, Lower Sonoran Zone; Mojave Desert, southern California. Type locality: Lone Pine, Inyo 

 County, California. May-June. 



101. Astragalus platytrdpis A. Gray. Broad-keeled Locoweed. Fig. 2875. 



Astragalus platytropis A. Gray, Proc. Amer. Acad. 6: 526. 1865. 

 Tragacantha platytropis Kuntze, Rev. Gen. PI. 947. 1891. 

 Cystium platytrope Rydb. N. Amer. Fl. 24 : 406. 1929. 



Cespitose perennial from stout horizontal rootstocks, densely silvery-silky throughout, the 

 stems short, seldom over 5-8 cm. long. Leaflets 7-13, obovate to oblong, about 5 mm. long; pe- 

 duncles 15-25 mm. long; flowers subcapitate; calyx-tube densely silky-pubescent, 3-4 mm. long, 

 equaled or exceeded by the subulate teeth ; corolla 6-7 mm. long, scarcely exserted, ochroleucous, 

 except the purple keel; pod ovoid, very short-pointed, 15-20 mm. long, strigose, and usually 

 mottled. 



Gravelly alpine slopes, Boreal Zones; Sierra Nevada, California, to the Humboldt and Wasatch Mountains, 

 Nevada. Type locality: mountain near Sonora Pass, California, growing in loose gravel and sand near the 

 summit, altitude 10,000 feet. July-Aug. 



102. Astragalus araneosus Sheldon. Gilliam Locoweed. Fig. 2876. 



Astragalus araneosus Sheldon, Minn. Bot. Studies 1: 170. 1894. 



Cystium platyphyllidium Rydb. N. Amer. Fl. 24: 410. 1929. 



Astragalus Icntiainosus var. cuspidocarpus M. E. Jones, Proc. Calif. Acad. II. 5: 673. 1895. Not A. cuspido- 



carpus Sheldon. 1894. 

 Cystium cornutum Rydb. N. Amer. Fl. 24: 412. 1929. 



Perennial with a cespitose caudex, the stems decumbent, 3-4 dm. long, glabrous. Leaves 

 5-10 cm. long; leaflets 11-15, obovate to oblong-obovate, 1-2 cm. long, 5-12 mm. wide, glabrous, 

 rounded or retuse at apex; peduncles 3-4 cm. long; racemes 1.5-2 cm. long, 5-10-flowered ; 

 calyx sparsely black-hairy, the tube 4 mm. long, the teeth subulate, 2 mm. long ; corolla about 

 12-15 mm. long, white tipped with purple; pod ovoid-lanceolate, arcuate, slightly sulcate at least 

 on the upper suture, 20-25 mm. long, 5-7 mm. wide, leathery, glabrous or becoming glabrate 

 and mottled. 



Drv hillsides. Arid Transition and Upper Sonoran Zones; eastern Washington to northeastern California, 

 Idaho, and Nevada. Type locality: Pine Creek, Gilliam County, Oregon. April-June. 



