116 PROCEEDINGS OF THE AMERICAN ACADEMY 



28. A. EXPANSA. Resembling the last, but stouter, erect, more 

 divaricately and distantly branched, with thinner triangular subhastate 

 leaves, sessile or very nearly so, the terminal staminate spikes usually 

 slender and leafless toward the apex, interrupted. — From New Mexico 

 and Southern Colorado to Southern California. Described by Mr. 

 Wright as growing in the bottoms of the Rio Grande in intricately 

 entangled masses 6-10 feet in diameter and 4—6 feet high. 



Obione argentea. Torrey, Emory's Rep. 149 ; Pac. R. R. Rep. 2. 173 ; Bot. 

 Mex. Bound. 182. 



Collectors: — 708 Fendler; 574 Wright; Emory; Bigelow ; 460 Torrey; 

 Greene. 



Sect. III. Perennials, more or less shrubby, closely appressed scurfy, 

 mostly dioecious. Radicle usually superior. Leaves mostly alter- 

 nate. 



§ 8. Fruiting bracts orbicular to ovate, with a toothed margin and 

 the sides usually more or less appendaged, somewhat spongy : 

 flowers axillary or spicate. 



* Fruiting bracts rather large, slightly compressed : leaves over 

 half an inch long, alternate. 



29. A. NuTTALLii. Erect, 1-2 feet high, branching mostly from 

 the base ; leaves narrowly oblong or oblanceolate, ^2 inches long, 

 obtuse or acutish, narrowed at base, sessile, entire ; calyx 5-cleft ; 

 bracts ovate, united to above the middle, the orifice scarcely contracted, 

 mostly sessile, becoming suborbicular and 1-^-2 lines long, not com- 

 pressed, the margin and summit irregularly gash-toothed and the sides 

 usually muricate or tooth-crested. — From the Saskatchewan to Colo- 

 rado and Northern Nevada. 



Atriplex canescens. Nuttall, Genera, 1. 197 ; not of James. Spreng. Syst. 



1. 961. Hook. Fl. Bor.-Ara. 2. 128; PI. Geyer, Lond. Jour. Bot. 



5. 261 (?) Dietr. Syn. 5. 537. Bourgeau, Palliser's Rep. 260. Porter, 



Hayden's Rep., 1871, 492. 

 Obione canescens. Moquin, Enum. Chenop. 74 ; DC. Prodr. 13'-. 112. Torrey, 



Nicollet's Rep. 158 ; Fremont's Rep. 95, in part ; Stansbury's Rep. 395, 



in part. Durand, Fl. Utah, 174, in part. Engelm. Pi. Upp. Miss. 206 ? 



Cooper, Pac. R. R. Rep. 12. 47 ? Gray, Proc. Pliil. Acad , 1863, 75. 



Watson, King's Rep. 5. 289, in part. Coulter, Hayden's Rep., 1872, 



779 ? Porter, Fl. Col. 117. 

 Atriplex Gordoni. Hook. PI. Geyer in Lond. Jour. Bot. 5. 261 1 



Collectors: — Richardson; Nicollet; Fremont; Burke; Bourgeau; Stans- 

 bury ; 308 Hall & Harbour ; 981 Watson ; Canby ; Gray ; Hayden ; 

 Burgess. 



