PEA FAMILY 589 



67. Astragalus Hornii A. Gray. Sheep Locoweed. Fig. 2841. 



Astragalus Hornii A. Gray, Proc. Amer. Acad. 7: 398. 1868. 

 Phaca Hornii Rydb. N. Amer. Fl. 24: 358. 1929. 

 Phaca tularensis Rydb. N. Amer. Fl. 24: 358. 1929. 

 Astragalus Hornii var. tularensis Jepson, Fl. Calif. 2: 354. 1936. 



Annual, the stems slender, widely spreading-, 6-12 dm. long, herbage green, sparsely ap- 

 pressed-pubescent. Stipules herbaceous, reflexed; leaves 8-10 cm. long; leaflets not crowded, 

 19-29, narrowly oblong, 1-2 cm. long, obtuse ; peduncles 10-20 cm. long ; spikes densely-flowered, 

 4-5 cm. long in fruit ; calyx-tube campanulate, 3-4 mm. long, the teeth subulate, about 1 . 5 mm. 

 long ; corolla yellowish, about 8 mm. long ; pods erect, crowded, broadly ovoid, acuminate, 10-12 

 mm. long, pilose, 1 -celled. 



Low alkaline places, Sonoran Zones; Inyo and Tulare Counties, California, to northern Lower California 

 and southern Utah. Type locality: "Fort Tejon or in Owens Valley," California. Said to be poisonous to sheep. 

 May-Sept. 



68. Astragalus Preussii A. Gray. Preuss' Locoweed. Fig. 2842. 



Astragalus Preussii A. Gray, Proc. Amer. Acad. 6: 222. 1864. 

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

 Phaca Preussii Rydb. Bull. Torrey Club 40: 47. 1913. 



Perennial, with a stout woody root, and a short cespitose caudex, glabrous throughout ; stems 

 several, 2-5 dm. high, stout, glabrous. Leaves 7-11 cm. long; stipules large, broadly deltoid, 4-7 

 mm. long; leaflets 11-15, broadly obovate to oblong, 8-15 mm. long, obtuse to retuse at apex, 

 glabrous and somewhat fleshy; peduncles 5-10 cm. long; racemes 4-6 cm. long; calyx cylindric, 

 the tube 7-8 mm. long, the teeth subulate, 2-2.5 mm. long; corolla purple, 18-22 mm. long; 

 banner slightly arched ; pod glabrous, oblong, slightly curved especially at base, 20-25 mm. long, 

 6-8 mm. wide and thick ; stipe stout, 5-6 mm. long. 



Desert plains and hillsides, Lower Sonoran Zone; Mojave Desert along the eastern borders of California to 

 Nevada, southern Utah, and northern Arizona. Type locality: "Banks of the Rio Virgen [Nevada]." March-May. 



69. Astragalus Crotalariae (Benth.) A. Gray. Salton Locoweed. Fig. 2843. 



Phaca Crotalariae Benth. PI. Hartw. 307. 1848. 

 Astragalus Crotalariae A. Gray, Proc. Amer. Acad. 6: 216. 1864. 

 Astragalus limatus Sheldon, Minn. Bot. Studies 1: 126. 1894. 

 Astragalus Preussii var. limatus Jepson, Man. Fl. PI. Calif. 566. 1925. 



Perennial, with a stout taproot, often flowering as a winter annual, the stems solitary or 

 few, stout, often fistulous, 3-6 dm. high, strigose-pubescent. Leaves ascending with a stout 

 rachis, 7-12 cm. long; leaflets 11-17, oblong-obovate to broadly obovate, rounded or retuse at 

 the apex, 10-20 mm. long, sparsely strigose beneath, glabrous above ; stipules ovate-deltoid, free, 

 5-6 mm. long; peduncles 7-10 cm. long; racemes 4-8 cm. long; calyx strigose with mostly black 

 hairs, the tube 8 mm. long, broadly cylindric, the teeth subulate, 2 mm. long ; corolla dark purple, 

 about 2 cm. long ; pod obliquely ovoid-ellipsoid, 20-25 mm. long, 10-12 mm. wide, abruptly nar- 

 rowed at base to a very short stipe and at apex to a 3-4 mm. long mucronation, rather thinly 

 strigose. 



Dry plains and washes, Lower Sonoran Zone; Colorado Desert, southern California, southward to adjacent 

 Lower California. Type locality: erroneously given as Monterey, California. Collected by Coulter on his trip 

 from Monterey to Yuma. Feb.-March. 



Astragalus Crotalariae var. Davidsonii (Rydb.) Munz & McBurney, Bull. S. Calif. Acad. 31: 66. 1932. 

 (Phaca Davidsonii Rydb. N. Amer. Fl. 24: 362. 1929.) Leaflets glabrous; pods 5-8 mm. wide, glabrous. 

 Antelope Valley and western edge of the Mojave Desert, California. 



70. Astragalus Cottonii M. E. Jones. Olympic or Cotton's Rattle-weed. 



Fig. 2844. ' 



Astragalus olympicus Cotton, Bull. Torrey Club 29: 573. 1902. Not Pall. 1800. 

 Astragalus Cottonii M. E. Jones, Rev. N. Amer. Astrag. 135. 1923. 

 Atelophragma Cottonii Rydb. Bull. Torrey Club 55: 121. 1928. 



Cespitose perennial, with a deep taproot, the stems several, prostrate, 1-2 dm. long, villous. 

 Leaves 2-3 cm. long, spreading; leaflets 11-17, oblong, 5-12 mm. long, 2-3 mm. wide, acutish, 

 villous-canescent on both sides; peduncles 3-5 cm. long; racemes 2-3 cm. long, 8-15-flowered; 

 calyx-tube 4-5 mm. long, pubescent with mixed black and white hairs, the teeth subulate, 2-3 mm. 

 long; corolla greenish white, the keel purple-tipped, 8-10 mm. long; pods glabrous, ellipsoid, 

 20-25 mm. long, 8-12 mm. wide, the stipe 5 mm. long. 



Talus slopes, Boreal Zones; Olympic Mountains, Washington. Type locality: Olympic Mountains, Wash- 

 ington. June— Aug. 



71. Astragalus Forwoodii var. wallowensis (Rydb.) M. E. Peck. Wallowa 



Rattle-weed. Fig. 2845. 



Atelophragma wallowense Rydb. Bull. Torrey Club 55: 122. 1928. 



Astragalus Forwoodii var. wallowensis M. E. Peck, Man. PI. Oregon 447. 1941. 



Perennial with a woody root and cespitose caudex, the stems decumbent, 1-2 dm. long, 

 strigose. Leaves 2-4 cm. long ; leaflets 9-13, oblong-lanceolate, acute at each end, 8-15 mm. long, 

 short villous-canescent below, becoming glabrous or nearly so above; peduncles 3-7 cm. long; 

 racemes becoming elongate and lax in age; calyx black-hairy, the tube 3 mm. long, the teeth 

 subulate, 2 mm. long; corolla about 1 cm. long, purplish, the keel with dark purple tip; pod 



