PEA FAMILY 597 



93. Astragalus pachypus Greene. Thick-podded Rattle-weed. Fig. 2867. 



Astragalus pachypus Greene, Bull. Calif. Acad. 1: 157. 1885. 

 Brachyphragma pachypus Rydb. N. Amer. Fl. 24: 401. 1929. 



Perennial, distinctly woody below, the branches of the season several, densely strigose, 

 ascending. Leaves 10-15 cm. long; leaflets rather distant, 15-21, narrowly linear, 15-20 mm. 

 long, white-strigose; peduncles stout, 10-20 cm. long; racemes loosely flowered, 5-10 cm. long; 

 calyx-tube 4 mm. long and as broad, sparingly black-hairy, the teeth subulate, 3 mm. long; 

 corolla 16-20 mm. long, white or cream-colored ; pods thick-coriaceous, glabrous, wrinkled, 18-25 

 mm. long, 5 mm. wide, compressed, both sutures prominent. 



Gravelly or sandy soils, Upper Sonoran Zone; Inner Coast Ranges, San Benito County, south to the San 

 Jacinto Mountains, southern California. Type locality : Tehachapi Mountains, Kern County, California. March- 

 May. 



Astragalus pachypus var. Jaegeri Munz & McBurney, Bull. S. Calif. Acad. 31 : 67. 1932. Differs from 

 the species in having yellow flowers 12-13 mm. long. Desert slopes, western Riverside County, California. 



94. Astragalus Coulteri Benth. Coulter's Locoweed. Fig. 2868. 



Astragalus Coulteri Benth. PI. Hartw. 307. 1848. 



Astragalus lentiginosus var. Coulteri M. E. Jones, Contr. West. Bot. No. 8: 4. 1898. 



Cystium Coulteri Rydb. Bull. Torrey Club 40: 50. 1913. 



Perennial or biennial from a taproot, often flowering as a winter annual, the stems ascending 

 or decumbent, flexuous, densely silvery-strigose. Leaflets mostly 13-17, oval to obovate, obtuse 

 or retuse, densely silky-strigose, 7-15 mm. long; peduncle stout, 5-8 cm. long; racemes loosely 

 flowered, 5-10 cm. long ; calyx-tube cylindrical, 4 mm. long, densely silvery-strigose, the teeth 

 subulate, 2-3 mm. long; corolla purple, 12-14 mm. long; pod much inflated, rather chartaceous, 

 the mottled surface usually obscured by the densely white-strigose pubescence, the body sub- 

 globose, 10-12 mm. long, the beak 3-6 mm. long. 



Dry desert hillsides and washes in sandy soils, Lower Sonoran Zone; Mojave and Colorado Deserts, southern 

 California to western Arizona and southern Nevada. Type locality: collected by Coulter on his trip from Mon- 

 terey, California, to Yuma. March-June. 



95. Astragalus agninus Jepson. Borrego Locoweed. Fig. 2869. 



Astragalus lentiginosus var. borreganus M. E. Jones, Rev. N. Amer. Astrag. 126. 1923. 

 Astragalus agninus Jepson, Man. Fl. PI. Calif. 577. 1925. 

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



Annual or biennial, with several stems arising from a taproot, 3-5 dm. high, branching and 



somewhat flexuose, densely white-silky. Leaves 5-10 cm. long; leaflets 7-15, oblong to obovate, 



obtuse to retuse, 6-12 mm. long, densely white-silky on both surfaces ; peduncles 3-10 cm. long, 



usually equaled or exceeded by the rather loosely flowered racemes ; calyx-tube 5 mm. long, the 



teeth triangular-subulate, 1 mm. long; corolla purple, 10-12 mm. long; pods lanceolate, 12—15 



mm. long, 4-5 mm. thick, slightly inflated, shallowly sulcate on the upper suture, nearly straight 



or strongly falcate, densely white-silky. 



Desert washes, Lower Sonoran Zone; Colorado Desert, Borrego Valley, California, to Yuma, Arizona. Type 

 locality: Borrego Springs, San Diego County, California. April-May. 



96. Astragalus Arthu-Schottii A. Gray. Schott's Locoweed. Fig. 2870. 



Astragalus Arthu-Schottii A. Gray, Proc. Amer. Acad. 6: 209. 1864. 

 Cystium Arthu-Schottii Rydb. N. Amer. Fl. 24: 409. 1929. 



Perennial, the taproot becoming woody with age ; stems several, branching from the base, 

 and ascending or decumbent, 10-30 cm. long, white-silky. Leaves 4-10 cm. long ; leaflets rather 

 distant, 7-17, elliptic to obovate, rounded or retuse at the apex, 7-15 mm. long, silky-pubescent 

 on both sides; peduncles 4-10 cm. long; racemes about the same length, loosely flowered; calyx 

 appressed-pubescent, the tube 4 mm. long, the teeth 2 mm. long, subulate ; corolla purple, 10-12 

 mm. long ; pod broadly ovoid, well inflated, deeply sulcate on the upper suture, papery, 15 mm. 

 long, 10-12 mm. thick, abruptly narrowed to a short upturned apex, sparsely strigose and con- 

 spicuously mottled. 



Sandy or gravelly soils, Lower Sonoran Zone; Mojave and Colorado Deserts, southern California, to south- 

 western Nevada, Arizona, Sonora, and Lower California. Type locality: diluvial banks of the Colorado near 

 its mouth. Feb.-May. 



97. Astragalus Fremontii subsp. eremicus (Sheldon) Abrams. Fremont's 



Locoweed. Fig. 2871. 



Astragalus eremicus Sheldon, Contr. U.S. Nat. Herb. 4: 86. 1893. 

 Cystium Kennedyi Rydb. N. Amer. Fl. 24: 407. 1929. 

 Cystium eremicum Rydb. N. Amer. Fl. 24: 409. 1929. 



Annual or perennial with a stout taproot, the stems branching fromthe base, decumbent or 

 ascending, 3-6 dm. long, rather sparsely silky-tomentose. Leaves ascending, 8-12 cm. long, leaf- 

 lets 11-21, oblong-elliptic to narrowly obovate, 1-2 cm. long, rather sparsely short-villous on 

 both surfaces with kinky hairs ; peduncles 5-10 cm. long, about equaling the racemes ; calyx-tube 

 5 mm. long, sparsely pubescent with black hairs, the teeth subulate, erect or recurved, 2 mm. 

 long ; corolla purple, 7-10 mm. long ; pod broadly ovoid, 18-25 mm. long, papery, abruptly nar- 

 rowed to a straight stout beak, glabrous or sparsely strigose. 



Sandy soils, Upper Sonoran Zone: eastern borders of California and western Nevada. Type locality: near 

 Lone Pine, Inyo County, California. May-Oct. 



