370 LEOUMINOSAE 



4 lines loii^; racemes lax, 5 to l.'3-llo\vere(l, V^ to 5 inches Ion;;; peduncles 5 lines to 

 2% inches lonjr; flowers 3 to 4 lines lonj?; calyx prray-stripfulose, the teeth broadly 

 lanceolate to subulate, V2 to % li"<* Ions, about ^^ as lonpr as the tube; corolla laven- 

 der to purple; pods oblong, acute, curved, cross-wrinUled, obcompressed, 4 to 5 

 lines lon^. 2 lines -wide, tijijied by a spine-like beak 1 line lon;,^ at base more or less 

 atteinuite into a stipe 1% to 2 lines lon^; dorsal suture intruded on proximal half 

 or third, tlie pods thus incompletely 2-celled. 



Dry flats and slopes, sagebrush association, 6000 to 7300 feet : eastern Inyo Co. 

 May-June. 



Note on occurrence and structure. — Aside from the type collection, we have seen only three 

 other collections: Cedar Flat, White Mts., Duran 3283; Westward Pass, Duran 279(5 (herbage 

 less pubescent than in the typo, the racemes shorter and few-flowered, the peduncles much shorter, 



5 to 11 lines long, and the pods more mature and exhibiting a somewhat cord-like ventral 

 suture) ; Lee District, Nelson Range, Hall 4- Chandler 7162. 



Kefs. — Astragalus inyoensis Sheld. ; Gov. Contrib, U. S. Nat. Herb. 4:86 (1893), type loc. 

 Darwin Mesa, near Mill Creek divide, Inyo Co., Coville 791; Jones, Eev. N. Am. Astrag. 263 

 (1923). Tium inyoense Rydb. N. Am. Fl. 24:389 (1929). 



47. A. tricarinatus Gray. Shuttle Loco. Stems erect, I/2 to II/2 feet high, 

 branching from base; herbage cauescent; leaves IV2 to SY2 inches long; leaflets 

 11 to 17, discrete or commonl}^ remote, linear to narrowly oblong, mostly truncatish 

 or notched at apex, 3 to 8 lines long; peduncles longer than the leaves, bearing a 

 loose raceme % to 3I/2 inches long; flowers 3 to 5^2 lines long; calyx-teeth subulate, 

 about as long as the broadly campanulate tube; corolla whitish or yellowish; pods 

 glabrous, strongly grooved on the back so as to appear triquetrous, or becoming 

 convex dorsally, straight or slightly curved, 9 to 17 lines long, almost completely 

 2-celled, stipitate, the stipe shorter than the calyx, jointed; seeds 8 or 10. 



Sandy flats or dry rocky slopes in the mountains, 2000 to 4900 feet : desert side 

 of the San Bernardino Mts.; Conchilla Range; New York Mts. Apr., fr. May. 



Locs. — Astragalus tricarinatus is a species remarkable for its glabrous three-sided pods, 

 something like a Y in cross-section. The pods thus have two flat sides (next the ventral suture) 

 and a third or grooved side (opposite the ventral suture). When, however, the fruit ripens into 

 the extreme stage preparatory to dehiscence, the outward pressure of the valves causes the 

 "groove" to disappear and the third side of the pod usually becomes plane or even a little convex. 

 The species appears to be rare. In any event only a few stations validated by fruiting specimens 

 are known : Quail Sprs., Conchilla Range, Mum 5220 ; Whitewater, e. end San Bernardino Mts., 

 Clary 19; Shays Well, w. of Warrens Well, Jepson 59G0 ; Cushenbury Sprs., Parish 2531; Barn- 

 well, New York Mts., K. Brandegee. Specimens resembling this species, in flower only, have 

 been collected in Coyote Canon (southwest side of the Santa Rosa Mts., Riverside Co.), at Banning 

 and in San Emigdio Canon, all with flowers 6 to 7 lines long. 



Refs. — Astragalus tricarinatus Gray, Proc. Am. Acad. 12:56 (1876), type loc. White- 

 water, Riverside Co., Parry; Jepson, Man. 574 (1925). Hamosa tricarinata Rydb. Bull. Torr. 

 Club 54:20 (1927). A. hernardinus Jones, Proc. Cal. Acad. ser. 2, 5:661 (1895), type loc. 

 Morongo King Mine, e. end San Bernardino Mts., Parish; a synonym as evidenced by the type 

 spm. (U. S. Nat. Herb.). Hamosa hernardina Rydb. Bull. Torr. Club 54:19 (1927). 



48. A. umbraticus Sheld. Wood Loco. Stems clustered, ascending, % to 1^/4 

 feet high; herbage glabrous or nearly so; leaves 2^/2 to 4% inches long; leaflets 13 

 to 23, elliptic to oblong, distinctly emarginate, 4 to 8 lines long; racemes short, 

 densely flowered, the flowers and fruit reflexed, the peduncles equaling or exceed- 

 ing the leaves; flowers 3i/^ lines long; calyx slightly pubescent, its teeth slender- 

 acuminate, about equaling the tube; corolla yellowish-white; pods spreading or 

 declined, linear, compressed, curved, grooved dorsally, incompletely 2-celled, gla- 

 brous, % to 1 inch long, stipitate; stipe about 1 line long; seeds 6 or 8. 



Openly wooded slopes, 2000 to 3000 feet: northern Humboldt Co. North to 

 southern Oregon. June, 



Locs. — Betw. Three Creeks and Redwood Creek, Eattan; Bald Hills near Hupa, Manning 

 306. Ore. : Glendale, Henderson 1342. 



