610 FABACEAE 



herbaceous to the base, 2-5 dm. long, prostrate, very sparsely strigose. Leaflets mostly H-13, 

 narrowly linear-lanceolate, acute, 4-8 mm. long, sparingly appressed-pubescent ; peduncles slender, 

 mostly 1-2 cm. long; racemes subcapitate, several-flowered; calyx-tube campanulate, silky- 

 villous, 4 mm. high, the alternate subulate teeth equaling or longer than the tube ; corolla about 

 6 mm. long, ochroleucous tinged with purple ; pod strigose, oblong-ovoid, about 7 mm. long, the 

 lower suture shallowly sulcate, cordate in cross-section, acute at apex and short-mucronate. 



Dry sagebrush-covered hillsides, Upper Sonoran Zone; southeastern Oregon (Klamath County) to northeast- 

 ern California (Sierra County). Type locality: Sierra Valley, California. May-Aug. 



137. Astragalus Brewed A. Gray. Brewer's Locoweed. Fig. 2911. 



Astragalus Breweri A. Gray, Proc. Amer. Acad. 6: 207. 1864. 

 Tragacantha Breweri Kuntze, Rev. Gen. PI. 2: 943. 1891. 



Annual, the stems ascending or decumbent, 1-2 dm. high, sparsely strigose with white hairs 

 or with white and black intermingling. Leaflets usually 9, cuneate-obovate, rounded or retuse at 

 apex, 5-10 mm. long, sparsely strigose beneath, glabrous above ; peduncles 2-8 cm. long, rather 

 slender ; flowers in several-flowered heads ; calyx-tube campanulate, 4 mm. high, densely black- 

 hairy with or without intermingling white hairs, the teeth subulate, about equaling the tube; 

 corolla 8-10 mm. long, purple, the banner with a yellow central spot ; pods sessile, the body 

 oblique, half -ovoid, about 7 mm. long, 3-sided, sulcate on the lower suture, silky-pubescent, tipped 

 with a slender beak about equaling the body. 



Grassy slopes and fields, Upper Sonoran and Humid Transition Zones; California Coast Ranges, from Men- 

 docino and Lake Counties to Marin County. Type locality: "Sonoma Valley, common in fields." April-July. 



138. Astragalus dispermus A. Gray. Desert Dwarf Locoweed. Fig. 2912. 



Astragalus dispermus A. Gray, Proc. Amer. Acad. 13: 365. 1878. 

 Hesperastragalus dispermus Heller, Muhlenbergia 1; 137. 1906. 



Annual, branching from the base, the stems slender, 1-2 dm. high, strigose. Leaves 2-4 cm. 

 long; leaflets mostly 9-13, oblong-cuneate, retuse, 4-6 mm. long, strigose and more or less canes- 

 cent; peduncles slender, 2.5-5 cm. long; flowers in a short dense spike; calyx densely white- 

 villous, 4 mm. long, the tube shorter than the subulate teeth ; corolla about 5 mm. long, little 

 exceeding the calyx, varying from white to purple ; pods scarcely equaling the calyx, deeply and 

 narrowly sulcate, the two lobes approximate, conspicuously rugose, short-pubescent, or rarely 

 glabrous. 



Dry sandy soils, Sonoran Zones; desert regions of southern California and Arizona. Type locality: Wicken- 

 burg, Arizona. April-May. 



139. Astragalus didymocarpus Hook. & Arn. Common Dwarf Locoweed. 



Fig. 2913. 



Astragalus didymocarpus Hook. & Arn. Bot. Beechey 334. 

 Hesperastragalus didymocarpus Heller, Muhlenbergia 2 : 87. 1905. 

 Hesperastragalus compaclus Heller, Muhlenbergia 2: 218. 1906. 

 Hesperastragalus obispensis Rydb. Bull. Torrey Club 53: 167. 1926. 

 Hesperastragalus Milesianus Rydb. Bull. Torrey Club 53: 169. 1926. 



Slender annual, branching from the base ; the stems 1-3 dm. high, sparsely strigose. Leaves 

 2-6 cm. long ; leaflets linear to linear-oblong, 4-12 mm. long, retuse, more or less cinereous with 

 an upwardly appressed short pubescence; peduncles slender, 1.5-3 cm. long; flowers capitate or 

 in short spikes ; calyx about 3 mm. long, the lobes villous with white and black hairs, equaling 

 the tube; corolla about 4 mm. long, cream-white or tinged with purple; pods 3.5 mm. long, 

 scarcely exserted beyond the calyx, and not reflexed, prominently ridged transversely or diago- 

 nally, minutely and sparsely puberulent, or rarely glabrous. 



Dry gravelly or sandy soils, Upper Sonoran Zone; Coast Ranges and the Great Valley, central California, 

 to northern Lower California. The glabrous-podded form is Hesperastragalus obispensis Rydb. and a form of 

 the Sierra foothills with a longer and more dense pubescence on the pods is Hesperastragalus compactus Heller. 

 Type locality: coastal California. March-May. 



Astragalus catalinensis Nutt. Proc. Acad. Phila. 4: 9. 1848. Perhaps too closely related to Astragalus 

 didymocarpus to be considered a distinct species. Differs principally in, the smaller flowers, the corolla being 

 scarcely 3 mm. long, and in the longer hairs on the pods. Originally discovered on Santa Catalina Island, but 

 also occurs about San Diego and in northern Lower California. 



140. Astragalus Gambellianus Sheldon. Gambell's Dwarf Locoweed. Fig. 2914. 



Astragalus nigrescens Nutt. Journ. Acad. Phila. II. 1: 153. 1847. Not Pall. 

 Astragalus Gambellianus Sheldon, Minn. Bot. Studies 1: 21. 1894. 

 Hesperastragalus Gambellianus Heller, Muhlenbergia 2: 87. 1905. 



Slender annual 4-20 cm. high, branching from the base. Leaves 1.5-3 cm. long; leaflets 9-13, 

 linear to cuneate-oblong, retuse, 3-8 mm. long, strigose, often sparsely so; peduncles slender, 

 1-3 cm. long; flowers short-spicate or capitate; calyx black-hairy, about 2.5 mm. long, the lobes 

 about equaling the tube ; corolla but slightly exceeding the calyx, purple or tipped with purple ; 

 pods well-exserted and strongly reflexed, pubescent with spreading crisped white hairs, slightly 

 curved and deltoid or ovoid, narrowly and deeply sulcate on the lower suture, the upper suture 

 forming a keel, the sides concave between the suture and the margin of the pod. 



Gravelly or sandy soils, Upper Sonoran Zone; Inner Coast Ranges and Sacramento Valley, to cismontane 

 southern California and northern Lower California. Type locality: Santa Catalina Island. April-May. 



Astragalus Gambellianus subsp. filmeri (Greene) Abrams. (Astragalus Elmeri Greene, Erythea 3: 98. 

 1895.) Like typical Astragalus Gambellianus in all essential characters but the pubescence of the pod upwardly 



