PEA FAMILY 575 



3 mm. long; corolla ochroleucous or white, 2 cm. long; pod erect, ovoid-oblong, acute, 15-20 mm. 

 long, 7-8 mm. wide, thick-walled, glabrous. 



Hillsides, Arid Transition Zone; eastern Washington and eastern Oregon to Idaho. Type locality: "Interior 

 of Oregon." May-July. 



Cnemidophacos Knowlesianus Rydb. N. Amer. Fl. 24 : 284. 1929. This is a form of A. reventus, charac- 

 terized by its sparsely black-hairy calyx and short-pubescent pods. Klickitat County, Washington, and adjacent 

 Oregon. 



23. Astragalus hoodianus Howell. Hood River Locoweed. Fig. 2797. 



Astragalus hoodianus Howell, Erythea 1: 111. 1893. 



Perennial from a woody crown, the stems erect, 10-15 cm. high, whole plant canescent with 

 a strigose pubescence. Leaflets 11-15, linear, 5-10 mm. long; peduncles stout, often 2-3 dm. long; 

 racemes loose, 5-8 cm. long ; calyx-tube cylindrical, 5 mm. long, the teeth subulate, about equal- 

 ing the tube; corolla white or ochroleucous, 16-18 mm. long; pod coriaceous, oblong, dorsally 

 compressed, 10—15 mm. long, pubescent. 



Dry hillsides, Arid Transition Zone; Hood River, Oregon, to The Dalles, Oregon, and across the Columbia 

 River in adjacent Washington. Type locality: hills along Hood River, Oregon. May-July. 



24. Astragalus iodanthus S. Wats. Violet Rattle-weed. Fig. 2798. 



Astragalus iodanthus S. Wats. Bot. King Expl. 70. 1871. 

 Tragacantha iodantha Kuntze, Rev. Gen. PI. 943. 1891. 

 Xylophacos iodanthus Rydb. Bull. Torrey Club 52: 144. 1925. 



Stems several from the woody crown, 1-3 dm. long, spreading or ascending, glabrous. 

 Stipules membranous, erect ; leaves 5-7 cm. long ; leaflets 13-19, or sometimes fewer, elliptic to 

 broadly oval or obovate, 5-10 mm. long, glabrous or very sparsely strigose ; peduncles 3^ cm. 

 long ; fruiting racemes 3-5 cm. long ; calyx-tube cylindric, 4 mm. long, black-hairy, teeth subulate, 

 scarcely 2 mm. long; corolla ochroleucous, about 10 mm. long; pods curved into almost a com- 

 plete circle, 20-25 mm. long, acuminate at apex, abruptly rounded to the sessile base, strongly 

 obcompressed and sulcate, strigose and mottled. 



Arid Transition and Upper Sonoran Zones; eastern base of the Sierra Nevada from Honey Lake, California, 

 to Esmeralda County, Nevada. Type locality: near Virginia City, Nevada. May. 



25. Astragalus Casei A. Gray. Case's Rattle-weed. Fig. 2799. 



Astragalus Casei A. Gray, Bot. Calif. 1: 154. 1876. 

 Tragacantha Casei Kuntze, Rev. Gen. PI. 943. 1891. 

 Xylophacos Casei Rydb. Bull. Torrey Club 52: 147. 1925. 



Stems numerous and freely branching from the woody crown, 2-4 dm. high, strigose and 

 more or less cinereous. Stipules green, reflexed; leaflets 5-11, rather distant, linear, 6-15 mm. 

 long, strigose ; peduncles 5-10 cm. long ; fruiting racemes 3-10 cm. long ; calyx-tube cylindric, 

 7 mm. long, black-hairy, the teeth subulate, scarcely 2 mm. long; corolla purplish, 12-15 mm. 

 long ; pods 4-5 cm. long, more or less arcuate, the acuminate beak upturned and the base de- 

 clined, 6-8 mm. broad, obcompressed, shallowly sulcate, strigose and rugose-reticulate when 

 mature. 



Sagebrush plains and hills, Upper Sonoran Zone; Pyramid Lake, Nevada, to the Panamint Mountains, 

 California. Type locality: "high plateau near Pyramid Lake." April-May. 



26. Astragalus Webberi A. Gray. Webber's Rattle-weed. Fig. 2800. 



Astragalus Webberi A. Gray, Bot. Calif. 1: 154. 1876. 

 Xylophacos Webberi Rydb. Bull. Torrey Club 52: 151. 1925. 



Stems 15-30 cm. high from a woody crown, strigose. Stipules lanceolate, reflexed; leaves 

 5-7 cm. long; leaflets 11-21, rather approximate, oblong or obovate-oblong, 10-15 mm. long, 

 densely silvery-canescent with a fine silky pubescence ; peduncles surpassing the leaves ; raceme 

 short, rather densely 9-20-flowered ; calyx-tube cylindric, 7 mm. long, the teeth subulate, about 

 3 mm. long ; corolla ochroleucous, about 12 mm. long ; pod 2-3 cm. long, acute at apex, rounded 

 at base, 8-12 mm. wide, obcompressed, shallowly and broadly sulcate, rugosely reticulate, 

 glabrous. 



Arid Transition Zone: mountain slopes about Sierra Valley, California. Type locality: Indian and Sierra 

 Valleys, California. July. 



27. Astragalus Newberry i A. Gray. Newberry's Woolly-pod. Fig. 2801. 



Astragalus Newberryi A. Gray, Proc. Amer. Acad. 12: 55. 1876. 

 Xylophacos Newberryi Rydb. Bull. Torrey Club 32: 662. 1906. 



Perennial, cespitose, the branches usually less than 1 dm. long. Leaflets 5-7, rarely 9, broadly 

 oblanceolate or obovate, 6-12 mm. long, densely silky with a fine strictly appressed pubescence ; 

 peduncles equal to or usually shorter than the leaves; racemes capitate, 5-7-flowered; calyx 

 silky-villous with interspersed black hairs, the tube cylindric, about 10 mm. long, the teeth subu- 

 late, 3 mm. long ; corolla 20-25 mm. long, tinged with purple, the keels tipped with dark purple ; 

 pods densely long-hairy, 2 cm. long and 1 . 5 cm. wide, ovoid to nearly globose, often somewhat 

 obcompressed, and slightly sulcate at base on both sutures. 



Sonoran Zones of the Great Basin Region, Nevada and Wyoming to the eastern edge of California (White 

 and New York Mountains) in the Mojave Desert, Arizona, and New Mexico. Type locality: "On the frontiers 

 of Utah and Arizona." March-May. 



