OF ARTS AND SCIENCES. 119 



36. A. ToRRETi. (Obione, Watson, King's Rep. 5.290.) Dif- 

 fusely and rigidly branched, 2-5 feet high, the leafy branches strongly 

 angled, the branchlets divaricate and spinescent, bluish gray ; leaves 

 ovate- to oblong-triangular, or subhastate, ^1 inch long; spikes dense ; 

 calyx deei^ly 4-cleft ; bracts orbicular to reniform, free, strongly com- 

 pressed, obscurely denticulate ; styles short ; seed f of a line broad, • 

 light colored ; radicle superior and projecting. — East of the Sierra 

 Nevada in the desert valleys of Nevada and on the Mojave. 



Collectors : — 463 Torrey ; 984 Watson ; Cooper ; Burgess. 



37. A. Breweki. Tall, 6 feet high or more, grayish, the branches 

 terete, unarmed, leafy; leaves ovate or subdeltoid, 1-2 inches long, 

 cuneate at base ; flowers mostly dioecious ; calyx deeply 4-cleft ; fruit- 

 ing bracts ovate to orbicular, convex, united at the margin to the middle, 

 entire, scarcely over a line long ; styles short ; seed f of a line long, 

 subcompressed, with a loose and somewhat thickened pericarp. — On 

 the seashore at Santa Monica and Santa Barbara, California. 



Collectors : — Fremont ; 459 Torrey ; 75 Brewer. 



§ 10. Bracts thick and scurfy, i inch broad, with suborbicular free 

 entire margins, not veined nor appendaged: flowers spicate or 

 axillary : leaves alternate : erect diffusely branched shrubs, leafy 

 and very scurfy. 



38. A. CONFERTIFOLIA. 1-5 feet high, subspinescent ; leaves ovate 

 or obovate to oblanceolate, 2-8 lines long, obtuse or acutish, cuneate 

 at base, sessile or shortly petioled, entire ; flowers in small axillary 

 clusters; calyx 5-cleft ; bracts sessile, united at the cuneate base 

 around the seed and broadly margined above; seed a line broad, 

 filling the cavity. — Abundant in alkaline valleys throughout the 

 Great Basin, from Southern Idaho and Wyoming to New Mexico 

 and Northern Mexico. 



Obione conferftfoUa. Torrey, Fremont's Rep. 318 (and Bot. Zeit. 5. 57 ; 



Walpers's Ann. 1. 567) ; Stansbury's Eep. 395; Pae. R. R. Rep. 2. 173; 



Bot. Mex. Bound. 183 ; Ives's Rep. 25. Durand, Fl. Utah, 174. Watson, 



King's Rep. 5. 289. Coulter, Hayden's Rep., 1872, 779. 

 Obione spinosn. Moquin, DC. Prodr. 13'^. 108. Engelm. PI. Upp. Miss. 206. 

 Atriplex spinosa. Dietrich, Syn. 5. 536. 

 Collectors : — 24, 761, 767 Fremont ; Stansbury ; 253 Stretch ; 468 Torrey ; 



Bigelow ; Palmer ; 2834 Brewer ; 983 Watson ; H. Engelmann ; Gray ; 



862 Kellogg & Harford ; Allen. 



39. A. HYMENELTTRA. Two to three feet high; leaves deltoid, 

 orbicular, or rhombic, ^1 inch in diameter, truncate or cuneate at 



