PEA FAMILY 355 



petioles i/4 to 1^/4 inches long, often exceeding the rachis; leaflets 7 to 11, oval to 

 obovate or oblong, 1 to 6 lines long; racemes lax, few-flowered, 5 to 11 V^ lines long; 

 peduncles % to IOI/2 lines long; flowers 3I/2 to 4 lines long; calyx strigulose, the 

 broadly subulate teeth about % to % the length of the tube; corolla purple, the 

 center of the banner marked with white lines; pods inflated, elliptic-ovoid, shortly 

 acute, strigulose, minutely purple-dotted or finely blotched when young, tardily 

 dehiscent, 1-celled, 9 to 11 lines long, deciduous from a minute stipe-like base; 

 ovules 8 to 12; seeds ovoid, smooth, brown, sparsely purple-dotted, flattened, a deep 

 hilar notch near the base. — (Caules ramosi, diffusi, foliosi, unc. ll^-6 longi; her- 

 bae albo-pubescentes; folia multa, unc. %-2i4 longa; petioli unc. Y^^-l^A longi; 

 foliola 7-11, ovalia, obovata vel oblonga, lin. 1-6 longa; racemi laxii, pauciflori, 

 lin. 5-11% longi, flores lin. 31/^^ longi; calyx strigulosus, tubo dentibus late subu- 

 latis circa duplo longiore; corolla purpurea, vexillo medio albo-lineato ; legumina 

 strigulosa, inflata, elliptico-ovoidea, acuta, brevissime stipitate, tarde dehiscentia, 

 uniloculata, lin. 9-11 longa.) 



Desert canons, 4000 to 5000 feet : Panamint Range. 



Locs. — Hanaupah Canon, Coville 4" Gilman 44 (type) ; Wild Rose Canon, Coville 4r Gilman 35. 



Refs. — Astragalus triflorus Gray, PI. Wright. 2:45 (1853). Phaca iriflora DC. Astrag. 

 62 (1802), type loc. volcano of Jorullo, Mex., Humboldt, ace. Gray I.e., not "Peru". Var. morans 

 Crura. 



16. A. sabulonum Gray. Gravel Loco. Stem diffusely branched from base, 

 2 to 10 inches high; herbage gray or grayish with close strigose pubescence, or 

 when young silvery; leaves II/2 to 2 inches long; leaflets 9 to 15, linear-oblong, 3 to 



5 lines long; racemes loose, rather few-flowered, ^2 to II/2 inches long; flowers 2^/2 

 to 3 lines long; calyx-teeth lanceolate-subulate, a little longer than the tube; corolla 

 white; pods incurved-ovate, short-acuminate, ^2 to % inch long, 1-celled, pubes- 

 cent; seeds several. 



Arid mesas, 50 to 500 feet : Colorado Desert. East to southern Utah. Apr. (fr.) . 



Locs. — Split Mt., T. Brandegee; Coyote Wells, Newlon 409; Indio, Orcutt ; Hodges Mts., 

 Hall 5976; McCoy Wash, Hall 5945. Nevada: Rhodes, Esmeralda Co., Shockley 355. 



Refs. — Astragalus sabulonum Gray, Proc. Am. Acad. 13:368 (1878), type loc. se. border 

 of Nev., Palmer in 1877; Jepson, Man. 568 (1925). A. virgineus Sheld.; Cov. Contrib. U. S. Nat. 

 Herb. 4:88 (1893), type loc. valley of Virgin River, Nev., V. Bailey 1910. 



17. A. aridus Gray. Explorers Loco. Stem freely branched from the base, 



6 to 12 inches high; herbage and pods silvery-pubescent, often glabrate; leaves % 

 to 11/2 inches long; leaflets 9 to 15, oblong to obovate, 3 to 5 lines long; flowers few, 

 2% lines long, in loose racemes on peduncles shorter than the leaves; calyx about 

 half as long as corolla, the slender teeth about as long as the tube; corolla yellowish- 

 white; pods sessile, narrowly ovate, somewhat incurved, inflated, markedly acute 

 at apex, 5 to 6 lines long, 1-celled, several-seeded. 



Dry mesas, sandy flats or alkaline plains, 10 to 1500 feet : Colorado Desert. Apr. 



Locs. — Coyote Wells, Newlon 408; Carrizo Creek, Orcutt 2239; Vallecito, Jepson 8613; 

 Borrego Sprs., T. Brandegee ; Silent Caiion, se. end Santa Rosa Mts., Jepson 11,712b; Brawley, 

 W. S. Childs; betw. Westmoreland and Indio, Newlon 422; CoacheUa, Greata; Mecca, Parish 

 8467 ; McCoy Wash, Hall 5937 ; Ft. Yuma (w. of), Jones. 



Refs. — Astragalus aridus Gray, Proc. Am. Acad. 6:223 (1864), type collected betw. 

 mouth of Gila River and San Diego, Thurber; Jepson, Man. 568 (1925). A. albatus Sheld. Minn. 

 Bot. Stud. 1 :128 (1894), type loc. Colorado Desert, Orcutt. Tragacantha arida Ktze. Rev. Gen. PI. 

 2:943 (1891). Phaca arida Rydb. N. Am. PI. 24:354 (1929). P. arenicola Rydb. N, Am. PI. 

 24:356 (1929), type loc. Mecca, Parish 8467, supposedly a perennial. 



18. A. agninus Jepson. Borrego Loco. Biennial; stems several from the 

 base, decumbent, often zigzag, % to 1% feet high; herbage hoary-canescent; stip- 

 ules distinct, triangular, scarious; leaves 2 to 3 inches long; leaflets 7 to 13, obovate 

 to oblong, obtuse or retuse, 3 to 5 lines long; raceme somewhat loose, 1^^ to 2 

 inches long; flowers 4 lines long; calyx-teeth subulate, about % as long as the nar- 



