606 FABACEAE 



teeth subulate, 1.5 mm. long; corolla violet-purple to white, 8-12 mm. long; pods nearly straight 

 or somewhat curved, at least toward the base, 3-4.5 cm. long, 2 mm. wide and as thick, attenuate 

 at apex, and somewhat so at base, very narrowly sulcate dorsally, strigose. 



Stream banks, mainly Humid Transition Zone; Humboldt and Mendocino Counties, California. Type 

 locality: Bug Creek, Humboldt County, California. June-July. 



123. Astragalus austrinus (Small) Schulz. Sonora Rattle-weed. Fig. 2897. 



Astragalus Nuttallianus var. trichocarpus Torr. & Gray, Fl. N. Amer. 1 : 334. 1838. 



Astragalus Nuttallianus var. canescens Torr. & Gray, Pacif. R. Rep. 2: 163. 1856. 



Hamosa austrina Small, Fl. S.E. U.S. 618. 1903. 



Astragalus pertenuis Greene, Leaflets Bot. Obs. 2: 42. 1910. 



Astragalus austrinus Schulz, 500 Wild Fl. San Antonio 104. 1922. 



Hamosa Emoryana Rydb. Bull. Torrey Club 54: 327. 1927. 



Hamosa imperfecta Rydb. Bull. Torrey Club 54: 329. 1927. 



Annual, stems branched at the base, decumbent, 0.5-2.5 dm. long, pubescence sparingly to 

 densely strigose. Leaves 2-5 cm. long; leaflets 9-11, oblong to linear, usually acute; peduncles 

 slender, 3-10 cm. long, surpassing the leaves ; inflorescence 1-4-flowered, subcapitate, calyx white- 

 strigose, 3-5 mm. long, teeth subulate, equaling or nearly equaling the tube ; flowers white tinged 

 with purple, 4-6 mm. long ; pod 1-1 . 5 cm. long, 2 mm. wide, strigose to glabrous, more or less 

 arcuate, sometimes incompletely 2-celled. 



Western Nevada and the Death Valley region to Lower California, Sonora, and western Texas. Type 

 locality: Fronteras, Sonora. March-April. 



124. Astragalus acutirostris S. Wats. Beaked Rattle-weed. Fig. 2898. 



Astragalus acutirostris S. Wats. Proc. Amer. Acad. 20; 360. 1885. 

 Oxytropis acutirostris M. E. Jones, Proc. Calif. Acad. II. 5: 677. 1895. 

 Aragallus acutirostris Heller, Cat. N. Amer. PI. 4. 1898. 

 Hamosa acutirostris Rydb. Bull. Torrey Club 54: 331. 1927. 

 Astragalus Nuttallianus var. acutirostris Jepson, Fl. Calif. 2: 379. 1936. 



Annual, the stems several, decumbent, 1-2 dm. long, whole plant cinereous, with upwardly 

 curved or somewhat appressed short pubescence. Leaves 1.5-2 cm. long; leaflets 9-13, oblong- 

 oblanceolate, usually retuse, 4-10 mm. long, 2-3 mm. wide ; peduncles very slender, 3-6 cm. long ; 

 racemes loosely 2-8-flowered; calyx-tube scarcely more than 1 mm. long, usually black-hairy; 

 teeth subulate, 1 mm. long ; corolla white or tinged with purple, 5 mm. long ; keel with an acute 

 beak; pods spreading or ascending, linear, only slightly curved, about 15 mm. long, 2.5 mm. wide, 

 abruptly acute at both ends, deeply and narrowly sulcate dorsally, strigose. 



Dry desert slopes, Lower Sonoran Zone; Mojave Desert, California, and southern Nevada. Type locality: 

 near Brown's Ranch, Mojave Desert, California. April-May. 



125. Astragalus Bolanderi A. Gray. Bolander's Locoweed. Fig. 2899. 



Astragalus Bolanderi A. Gray, Proc. Amer. Acad. 7 : 337. 1868. 

 Astragalus supervacaneus Greene, Erythea 1: 221. 1893. 

 Hesperonix Bolanderi Rydb. N. Amer. Fl. 24: 440. 1924. 



Stems several from the crown of a woody rootstock, decumbent or ascending, 3-5 dm. long, 

 sparsely strigose. Leaflets mostly 17-19, linear-oblong, 7-10 mm. long, sparsely woolly-pubes- 

 cent ; peduncles 5-10 cm. long ; racemes subcapitate, rather densely flowered ; calyx-tube 4 mm. 

 long, sparsely pubescent, the teeth triangular-subulate, 2 mm. long ; corolla 12 mm. long, white 

 or yellowish; pod inflated, 15 mm. long, 7-8 mm. wide and thick, gradually narrowed from the 

 rounded base to the apex, and strongly arched, thin, coriaceous, reticulate, glabrous, lower suture 

 sulcate, 2-celled, except the flattened acute apex ; stipe slender, 5-7 mm. long. 



Granitic gravels and sand, mainly Canadian Zone; Sierra Nevada, California. Type locality: "Dry ground, 

 at Ostrander's Ranch, Yosemite Valley." June-Aug. 



126. Astragalus accidens S. Wats. Rogue River Rattle-weed. Fig. 2900. 



Astragalus accidens S. Wats. Proc. Amer. Acad. 22: 471. 1887. 

 Hesperonix accidens Rydb. N. Amer. Fl. 24: 438. 1929. 



Stems from a slender woody rootstock, decumbent or ascending, 3-4 dm. high, sparingly 

 pubescent, leaflets mostly 21-25, oblong-elliptic, retuse, 10-15 mm. long, sparsely pubescent with 

 upwardly curved hairs, peduncles 6-8 cm. long ; racemes about 2 cm. long ; calyx-tube 3-4 mm. 

 long, black-hairy; teeth triangular-subulate, scarcely 2 mm. long; corolla white, 15 mm. long; 

 body of the pod 8-12 mm. long, equaled by the slender stipe, half-ovoid, about 5 mm. wide and 

 nearly as thick, coriaceous, transversely reticulate, strigose, 2-celled. 



Dry open woods, Arid Transition Zone; Cow Creek Mountains and hills about Rogue River Valley, southern 

 Oregon. Type locality: Cow Creek Mountains. May-June. 



127. Astragalus Watsonii Sheldon. Watson's Locoweed. Fig. 2901. 



Astragalus Hendersonii S. Wats. Proc. Amer. Acad. 22: 471. 1887. Not Baker 1879. 



Astragalus Watsonii Sheldon, Minn. Bot. Studies 1: 23. 1894. 



Astragalus pacificus Sheldon, Minn. Bot. Studies 1: 174. 1894. 



Astragalus accidens var. Hendersonii M. E. Jones, Rev. N. Amer. Astrag. 164. 1923. 



Stems several, decumbent, from a slender woody rootstock, 3-4 dm. high, sparingly pubescent 

 with upcurved hairs. Leaflets mostly 21-25, oblong-elliptic, retuse, about 1 cm. long, loosely 



