354 



LEQUMINOSAE 



13. A. macrodon Gray. Jolon Loco. Essentially like A. douglasii; herbage 

 commonly closely hairy, the young parts and the calyces very densely so and there- 

 fore white-hairy; pods densely piiberulent. 



Flats and hill slopes, 500 to 1300 feet : upper Salinas River valley and the neigh- 

 boring hill country. June- July (fl. and fr.). 



Tax. note. — In practically every particular save in the fruit, Astragalus macrodon is like A. 

 douglasii, especially in details of inflorescence and flower, and in habit. The absolute and relative 

 lengths of the calyx-teeth and calyx-tube vary within the same limits in the case of each species. 



It were then, perhaps, better to count it as a pubescent- 

 fruited variety of A. douglasii. Its habits are very 

 little known. 



Locs. — Creston road near Paso Kobles, Jones; 

 Jolon, K. Brandegee. 



Refs. — Astragalus macrodon Gray, Proc. Am. 

 Acad. G:216 (18C4) ; Jepson, Man. 567 (1925). Fliaca 

 macrodon H. & A. Bot. Beech. 333 (1838), type from 

 Cal., Douglas. Tragacantha macrodon Ktze. R«v. Gen. 

 PI. 2:946 (1891). A. holosericeus Jones, Proc. Cal. 

 Acad. ser. 2, 5:638 (1895), type loc. betw. King City 

 and Jolon, Monterey Co., Eastwood. 



Fig. 208. Astragalus pulsiferae 

 Gray, a, fl. branch, X%;b,fl.,X IVi ; 

 c, pod, X \; d, cross sect, of pod, X 1. 



14. A. hornii Gray. Sheep Loco. Stems 

 slender, widely spreading or prostrate, 3 to 4 

 feet long; herbage rather sparsely appressed- 

 pubescent or the stems and upper surface of 

 the leaves glabrate; leaves 3 to 5I/2 inches long; 

 leaflets 15 to 31, narrowly oblong or linear, 

 obtuse, 3 to 8 lines long; peduncles 2 to 7 inches 

 long, divaricately or widely spreading, sur- 

 passing the leaves; spikes short or capitate, 

 crowded; equallj^ crowded in fruit (% to 1% 

 inches long) ; flowers 3 to 4 lines long; calyx- 

 teeth subulate, about as long as the campanu- 

 late tube; corolla yellowish-white; pods broadly 

 ovate, acuminate, straight, 1-celled, 5 lines 



long, densely white-pilose when young, less conspicuously so when mature, 6 to 



15-seeded. 



Alkaline valley flats and plains, 400 to 1100 feet : upper San Joaquin Valley 



in Kern Co. ; San Bernardino Valley. Lower California. Oct. 



Field note. — This plant is considered poisonous to sheep. In the San Bernardino Valley 



it is now exterminated by cultivation according to a note by Parish in 1914. In 1873 it (with 



A. lentiginosus) was said to prevail quite abundantly over an area of 150 square miles in the 



upper San Joaquin Valley (U. S. Dept. Agr. Eep. 1874:159). A. hornii is still common in the 



Bakersfield region. We have no records from the Mohave Desert. The printed heading on the 



label of the type spm. of A. hornii (Gray Herb.) reads "Owens Valley and Fort Tejon", but 



there is no evidence that it occurs in the Owens Valley (as stated in Bot. Cal. 1:150), although 



it does occur in the Fort Tejon region. 



Locs. — San Bernardino, Parish 2004 ; Bakersfield, Leclcenby. 



Var. tularensis Jepson comb. n. Herbage more pubescent; leaflets smaller and fewer, 13 



to 17, the uppermost at least linear-oblong or oblanceolate ; peduncles slender, 2 to 3 inches long ; 



racemes 1/. to 1 inch long; flowers 3% lines long; pods smaller. — Upper San Joaquin Valley in 



Kern and Tulare Cos.: Bakersfield, Hall 8343. 



Eefs. — Astragalus hornii Gray, Proc. Am. Acad. 7:398 (1868), type loe. Ft. Tejon, Horn; 



Parish, Zoe 4:103 (1890) ; Jepson, Man. 567, fig. 556 (1925). Phaca hornii Eydb. N. Am. Fl. 



24:358 (1929). Var. tularensis Jepson. Phaca tularensis Eydb. N. Am. Fl. 24:358 (1929), 



type loc. near Tulare Lake, Lemmon. 



15. A. triflorus Gray var. morans Crum var. n. Devil's Loco. Stems tufted 

 on a slender taproot, diffusely branched with short internodes, leafy, 1^/2 to 6 

 inches long; herbage whitish-pubescent; leaves many, % to 2^4 inches long, the 



