586 FABACEAE 



6-12 mm. long, appressed-pubescent below, sparsely so or glabrous above ; raceme exceeding the 

 leaves, loosely flowered ; calyx-tube 1 . 5 mm. long, white-strigose often with a few intermingling 

 black hairs ; lobes subulate, 1 mm. long ; corolla rose-colored or white, 5 mm. long, the standard 

 purple-veined ; pod round-obovoid, 8-10 mm. long, 5-6 mm. wide, sessile, usually pubescent with 

 spreading white hairs. 



Alpine ridges, Boreal Zones; British Columbia south to the Olympic Mountains and east through Wash- 

 ington to Montana. Type locality: Fort Colville, Washington. July-Sept. 



58. Astragalus diurnus S. Wats. John Day Rattle-weed. Fig. 2832. 



Astragalus diurnus S. Wats. Proc. Amer. Acad. 21: 450. 1886. 

 Astragalus Craigii M. E. Jones, Contr. West. Bot. No. 1 : 42. 1900. 

 Phaca diurna Rydb. N. Amer. Fl. 24: 353. 1929. 



Perennial from slender underground rootstock, much branched and tufted, 3-4 dm. high. 

 Leaves 4-5 cm. long; leaflets 9-11, 2-8 mm. long, ovate-obovate, obtuse or retuse, glabrous above, 

 strigose beneath; peduncles shorter than the leaves, slender, few-flowered; calyx-tube turbinate- 

 campanulate, 2 mm. long, the teeth triangular-subulate, nearly equaling the tube ; corolla white, 

 tinged with purple at apex, 7-8 mm. long, arched; pod obliquely oblong-ovoid, about 15-18 mm. 

 long and 1 cm. wide, the ventral suture slightly convex at apex and base, and concave in the 

 middle, truncate at base, much flattened at tip and acute, strigose, becoming nearly glabrous in 

 age, stiff-papery. 



Dry hillsides, Upper Sonoran Zone; John Day Valley, eastern Oregon. Type locality: Dayville, John Day 

 River, Oregon. May. 



Astragalus Gilmanii Tidestrom. Proc. Biol. Soc. Wash. 50: 20. 1937. {A. triflorus var. morans Crum ex 

 Jepson Fl. Calif. 2: 354. 1936.) Cespitose perennial, the stems 10-20 cm. long, strigose. Leaves 4-5 cm. long; 

 leaflets' 9-13, oblong to obovate-oblong, 5-10 mm. long, cinereous-strigose; racemes shorter than the leaves; calyx 

 4 mm. long, hirsutulose with white hairs; corolla 7-8 mm. long, dark purple becoming white below; pod sessile, 

 1-celled inflated, ovoid, abruptly acute, 2 cm. long, strigose. A little known species apparently restricted to the 

 Panamint Mountains, Mojave Desert, California. Type locality: Death Valley Canyon. It also has been col- 

 lected at head of Hanaupah and Wild Rose Canyons. 



59. Astragalus Geyeri A. Gray. Geyer's Rattle-weed. Fig. 2833. 



Phaca annua Geyer ex Hook. Lond. Journ. Bot. 6: 213. 1847. Not. A. annuus DC. 1802. 

 Astragalus Geyeri A. Gray, Proc. Amer. Acad. 6: 214. 1864. 



Annual, usually much branched, 5-15 cm. high, herbage appressed-pubescent, canescent when 

 young, becoming greener with age. Leaves 3-6 cm. long; leaflets usually rather distinct, 11-19, 

 linear-oblong, 10-15 mm. long, becoming glabrate above; peduncles slender, 10-25 mm. long, 

 2-5-flowered; calyx-tube campanulate, 1-2 mm. long, the teeth subulate, equaling the tube; 

 corolla whitish, 6 mm. long, the banner strongly arched; pod ovoid, acute, 15-18 mm. long, 8-10 

 mm. wide, sparsely strigose. 



Sandy plains and hillsides. Upper Sonoran Zone; Great Basin region, eastern Oregon, and California east 

 of the Sierra Nevada to Wyoming. Type locality: "drift-sand plains of the Upper Platte." May-Aug. 



60. Astragalus chuckwallae Abrams. Chuckwalla Rattle-weed. Fig. 2834. 



Annual, the stems erect, branching from the base and above, 1-3 dm. high, strigose. Leaves 

 5-8 cm. long; leaflets 9-13, oblong or oblong-elliptic, 8-15 mm. long, glabrous or nearly so above, 

 sparsely strigose below; stipules lanceolate, 3 mm. long, black-hairy; peduncles 5-6 cm. long, 

 usually 5-6-flowered ; calyx black-hairy, the teeth subulate, 2 mm. long ; corolla 5-6 mm. long, 

 purplish; pod sessile, membranaceous, strigose, 18-20 mm. long, 10-12 mm. wide and thick, 

 rather abruptly short-pointed. 



Sandy washes, Lower Sonoran Zone; vicinity of Corn Springs, Chuckwalla Mountains, Colorado Desert, 

 southern California. March-May. 



Annua, erecta, ramosa, 1-3 dm. alta, strigosa; folia 5-8 cm. longa; foliola 9-13, oblonga vel oblongo-elliptica, 

 8-15 mm. longa; pedunculi 5-6 cm. longi, floribus 5-6; calyx nigra, hirsuta; corolla 5-6 mm. longa, purpurea; 

 legumen sessile, 18-20 mm. longum, 10-12 mm. crassum, abrupte apiculatum, membranaceum, strigosum. 



Type collected in sandv wash, vicinity of Corn Springs, Chuckwalla Mountains, Colorado Desert, California, 

 P. A. Mum & D. Keck 4779 (no. 155382 Dudley Herbarium). 



61. Astragalus aridus A. Gray. Annual Desert Rattle-weed. Fig. 2835. 



Astragalus aridus A. Gray, Proc. Amer. Acad. 6: 223. 1864. 

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

 Astragalus albatus Sheldon, Minn. Bot. Studies 1: 128. 1894. 



Annual, profusely branching from the base, 15-30 cm. high, whole plant densely silvery with 

 appressed pubescence. Leaves 4-7 cm. long; leaflets 7-15, elliptic to obovate, 6-10 mm. long; 

 peduncles slender, shorter than the leaves; racemes loosely few-flowered; calyx-tube 4 m long, 

 the teeth lanceolate-subulate, longer than the tube ; corolla cream-yellow or tipped with purple, 

 6-7 mm. long; pods sessile, erect, 10-12 mm. long, 5-6 mm. wide, narrowly ovoid, somewhat 

 incurved, acute. 



Sandy desert plains and hillsides; Colorado Desert, southern California, to northern Lower California. 

 Type locality: Colorado Desert, California. March-May. 



62. Astragalus Harwoodii (Munz & McBurney) Abrams. Harwood's 



Rattle-weed. Fig. 2836. 



Astragalus insularis var. Harwoodii Munz & McBurney, Bull. S. Calif. Acad. 31 : 66. 1932. 



Annual, strigose-canescent throughout, the stems diffusely branching from the base, 1-3 dm. 



