600 



FABACEAE 



108. Astragalus Layneae Greene. Layne's Rattle-weed. Fig. 2882. 



Astragalus Layneae Greene, Bull. Calif. Acad. 1: 156. 188S. 

 Hamosa Layneae Rydb. Bull. Torrey Club 54: 15. 1927. 



Perennial, cespitose, stems usually only a few from the crown of the woody root, usually 

 less than 1 dm. long, whole plant pilose with appressed or ascending hairs. Leaves 6-10 cm. 

 long; leaflets 15-21, obovate, 6-15 mm. long; peduncles stout, 6-15 cm. long; racemes 5-10 cm. 

 long, loosely flowered; calyx-tube cylindric-campanulate, 5-7 mm. long, black-hairy; teeth subu- 

 late-triangular, 1 mm. long; corolla pale lilac, tipped with purple, 12-15 mm. long; pod villous, 

 2.5-3.5 cm. long, 6-7 mm. wide, obcompressed, broadly sulcate dorsally, strongly curved, long- 

 acuminate at apex. 



Rocky hillsides, Lower Sonoran Zone; Mojave Desert, southern California, to southern Nevada and western 

 Arizona. Type locality: Mojave Desert, southern California. April. 



109. Astragalus Andersdnii A. Gray. Anderson's Rattle-weed. Fig. 2883. 



Astragalus Andersonii A. Gray, Proc. Amer. Acad. 6: 524. 1866. 

 Hamosa Andersonii Rydb. Bull. Torrey Club 54: 16. 1927. 



Perennial, the stems usually numerous from the woody crown, mostly 2-3 dm. high, whole 

 plant hoary with a dense ascending or somewhat appressed silky-villous pubescence. Leaves 5-7 

 cm. long; leaflets mostly 13-15, oblanceolate or narrowly obovate, acute or obtuse, 7-12 mm. 

 long ; stipules herbaceous, triangular-subulate, 3 mm. long ; peduncles about equaling the leaves ; 

 racemes becoming loosely flowered, 4-6 cm. long; calyx-tube cylindric-campanulate, 5-6 mm. 

 long, 3-4 mm. broad, white-villous ; teeth subulate, 4-5 mm. long; corolla ochroleucous or tinged 

 with pink, 10-12 mm. long; pod 15 mm. long, 4 mm. wide, compressed, arcuate, acute at apex, 

 villous. 



Gravelly sagebrush land, Upper Sonoran Zone; eastern base of the Sierra Nevada, western Nevada and Cali- 

 fornia, from Lassen County to Inyo County, California. Type locality: near Carson City, Nevada. May-June. 



110. Astragalus succumbens Dougl. Sprawling Rattle-weed. Fig. 2884. 



Astragalus succumbens Dougl. ex Hook. Fl. Bor. Amer. 1: 151. 1831. 

 Astragalus dorychnioides Dougl. ex G. Don, Gen. Hist. PI. 2: 151. 1832. 

 Phaca succumbens Piper, Contr. U.S. Nat. Herb. 11: 370. 1906. 

 Hamosa succumbens Rydb. Bull. Torrey Club 54: 14. 1927. 



Perennial, cespitose, the stems decumbent or ascending, the central one usually erect, 2-4 dm. 

 long, whole plant canescent with spreading pilose pubescence. Leaves 3-6 cm. long ; leaflets 9-17, 

 obovate to broadly oblanceolate, 6-12 mm. long; peduncles shorter than the leaves; racemes 2-3 

 cm. long ; bracts subulate, 5-7 mm. long ; calyx-tube cylindric-campanulate, 6-7 mm. long ; teeth 

 subulate, 3 mm. long, sparsely white-pilose with a few black hairs interspersed ; corolla ochro- 

 leucous tinged with rose toward the base, 15-18 mm. long; pods glabrous, 30-35 mm. long, 4-5 

 mm. wide, strongly flattened laterally, the lower suture deeply and narrowly sulcate, slightly 

 arcuate. 



In sand and rocky hillsides, Upper Sonoran Zone; eastern Washington from Klickitat and Walla Walla 

 Counties south to Gilliam and Umatilla Counties, eastern Oregon. Type locality: "On the barren grounds of the 

 Columbia and near the Wallawallah River." May-June. 



111. Astragalus calycosus Torr. King's Rattle-weed. Fig. 2885. 



Astragalus calycosus Torr. ex S. Wats. Bot. King Expl. 66. pi. 10. f. 4-7. 1871. 

 Hamosa calycosa Rydb. Bull. Torrey Club 40: 50. 1913. 



Perennial, cespitose, the stems several from the woody crown, very short, whole plant silvery- 

 silky. Leaflets 1-5, oblong to oblanceolate, obtuse or acutish, 6-8 mm. long ; peduncles slender, 

 2-4 cm. long, a little exceeding the leaves, 2-6-flowered; calyx-tube campanulate, 4 mm. long; 



\'i » 2864 



2864. Astragalus Brauntonii 



2865. Astragalus Serenoi 



2866. Astragalus mohavensis 



