PEA FAMILY 



363 



Locs. — Yreka, Butler 706; Hornbrook, Copeland 3512. Southern Ore.: Ashland, Hender- 

 son 224. 



Kefs. — Astragalus pacificus Sheld. Minn. Bot. Stud. 1:174 (1894); Jepson, Man. 570 

 (1925). A. hendersonii Wats. Proc. Am. Acad. 22:471 (1887), type loc. Siskiyou Mts., s. Ore., 

 Henderson ; not A. hendersonii Baker (1879). A. watsonii Sheld. Minn. Bot. Stud. 1:23 (1894) ; 

 not A. watsoniana (Ktze.) Sheld. I.e. 144. A. pruniformis Jones, Proc. Gal. Acad. ser. 2, 5:660 

 (1895), type loc. "Butte Co., Ore.," B. M. Austin. A. cymatodes Greene, Pitt. 3:196 (1897), type 

 loc. upper Sacramento Valley. A. aceidens var. pacificus Jones, Eev. N. Am. Astrag. 164 (1923). 

 A. aceidens var. hendersonii Jones, Eev. N. Am. Astrag. 164 (1923). Hesperonix watsonii Eydb. 

 N. Am. Fl. 24:439 (1929). 



30. A. serenoi Sheld. Cartridge Loco. (Fig. 210.) Stems freely branching, 

 erect, 1^2 to 2 feet high; herbage hoary-pubescent or in age (especially the steins) 

 glabrate and green, or the hoariness persistent on under side of leaflets; leaves 3^2 



to 4^2 inches long, the rachis thick and stem- 

 like, the 2 or 3 pairs of leaflets very remote; 

 leaflets linear, I/2 to 1^4 inches long; racemes 

 6 to 8-flowered, the flowers mostly distant; 

 corolla blue, 6 to 9 lines long; pods ascending 

 or erect, shortly subcylindric, that is very 

 turgid and oblong in outline, beaked, 7 to 9 

 lines long, 1-celled, or partially or in age com- 

 pletely 2-celled; beak spine-like or subulate, 

 11/2 lines long; fruiting pedicels II/2 lines long. 

 Gallon bottoms or alkaline flats, 4400 to 

 7500 feet: White Mts., Inyo Co. North 

 through Nevada from Mineral Co. to the Car- 

 son sink and the Humboldt Mts. May, fr. 

 July. 



Field note. — Distinguished by its peculiar bushy 

 habit and opposite branching and by its fleshy pods. 

 Astragalus serenoi Sheld. is a remarkable species of 

 the western deserts of Nevada which enters California 

 feebly in the region of the White Mts. The few 

 scattered leaflets sometimes tend to be deciduous, so 

 that the stem-like effect of the rachis is markedly 

 heightened. 



Locs. — Silver Canon, White Mts., Jepson 7209; 

 Black Canon, White Mts., Duran 2658. Nevada: Can- 

 delaria (Jones, Rev. N. Am. Astrag. 150). 



Eefs. — Astragalus serenoi Sheld. Minn. Bot. 

 Stud. 1:130 (1894). A. nudus Wats. Bot. King 74 (1871), type loc. West Humboldt Mts., 

 Nev., Watson 280; not A. nudus Clos. (1846). Tragacantha serenoi Ktze. Rev. Gen. PL 2:941 

 (1891). Brachyphragma serenoi Eydb. Am. Jour. Bot. 16:205 (1929). A. shocJcleyi Jones, 

 Proc. Cal. Acad. ser. 2, 5:659 (1895), type loc. Fish Lake Valley, Esmeralda Co., Nev., ShocMey 

 527; Jepson, Man. 569 (1925). Brachyphragma shocUeyi Rydb. N. Am. Fl. 24:400 (1929). 

 A. canonis Jones, Contrib. W. Bot. 8:15 (1898), type loc. Big Indian Canon, Hawthorne, Nev., 

 Jones; pods 12 lines long; beak 2 to 2% lines long; appears to be a robust form (type in Baker 

 Herb.). 



31. A. pycnostachyus Gray. Salt Loco. Stems rather stout, 1 to 3 feet high; 

 herbage grayish-pubescent, the hairs tending to be straight and appressed ; leaves 

 2 to 3 inches long; leaflets 23 to 31, narrowly oblong, crowded, ^/^ to % inch long; 

 peduncles a little shorter than the leaves; spikes oblong or cylindric, ver>^ dense, 

 1 to 21/2 inches long; flowers 4 to 5 lines long, shortly pediceled or subsessile; calyx- 

 teeth triangular- or ovate-acute or -subulate, % to 1 line long, % to % to as long as 

 the broadly campanulate tube; corolla whitish or yellowish; pods ovate, acute, 

 beaked with the persistent style, 1-celled, glabrous, veined, retrorsely imbricated, 

 4 to 4^ lines long; seeds few. 



Fig. 210. Astragalus serenoi Sheld. 

 c, fr. branch, X % ; fc, fl., X 1 ; c, pod, X 

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



