CHENOPODIACEAE. 117 



Bracts united to above the middle ; radicle superior. 



Bracts ustially broadly cuneate, truncate at the apex, seldom with tubercles ; 



leaves linear. 3. A. IVolfii. 



Bracts rhombic-orbicular, conspicuously toothed and appendaged, or tubercled 

 on the back ; leaf -blades rhombic, cordate br ovate. 

 Leaf-blades large, more or less hastate, truncate or cuneate at the base. 

 Leaf-blades rhombic-deltoid, minutely scurfy, acute. 



Leaves subsessile or the lower short petioled with winged petioles, very 



thin ; plant a thumble-weed, 1-3 m. in diameter. 4. A. cxpansa. 

 Leaves petioled, firmer ; plant scarcely a thumble-weed. 



5. A. argentea. 

 Leaf-blades subcordate, coarsely scurfy, obtuse. 6. A. cornuta. 



Leaf-blades small, i Cm. or less, ovate-lanceolate, rounded at the base, sub- 

 sessile, firm. 7. A. philonitra. 

 Perennials. 



Bracts not winged on the back. 



Bracts with entire margins or merely wavy, without appendages on the 

 back ; leaf-blades entire, broadly oval. 8. A. confertifolia. 



Bracts either with a distinctly toothed margin or appendaged on the back, 

 or both. 

 Bracts broadest above the middle. 



Bracts 3-toothed, only rarely tubercled on the back. 



9. A. eremicola. 

 Bracts entire, strongly tubercled or appendaged on the back. 



10. A. corrugata. 

 Bracts broadest below the middle, strongly tubercled or appendaged ; 

 leaf-blades oblanceolate to spatulate. 

 Leaf-blades oblanceolate or narrowly spatulate, subsessile or short- 

 petioled. 

 Low ; leaves usually short-petioled ; staminate flowers brown-puberu- 

 lent, in panicles. 11. A. oblanceolata. 



Usually tall ; leaves subsessile ; staminate flower yellow in inter- 

 rupted spikes. 12. A. Nuttallii. 

 Leaf-blades broadly spatulate, distinctly petioled ; staminate spikes 

 brown, interrupted. 13. A. ciineata. 

 Bracts broadly 4-winged on the back. 



Wings thick, laciniate-toothed. 14. A. odontoptera. 



Wings thin, sinuately dentate or subentire. 



^^■ ings when fully developed 4-6 mm. wide, distinctly dentate ; leaves 



broad, linear-oblong to spatulate. 15. A. ccuicsccns. 



Wings very broad and thin, fully 8 mm. wide, merely sinuate ; leaves 

 linear. 16. A. occidentalis. 



1. Atriplex carnosa A. Nels. {A. patnla liastata of Coulter's Man.) In 

 alkaline or saline meadows from Nebr. to Mont, and Kan. — Fort Collins. 



2. Atriplex subspicata (S. Wats.) Rydb. (A. patula subspicata S. Wats.) 

 In alkaline soil from N. D. to ]Mont., Colo, and Utah. — Alt. up to 9500 ft. — 

 Pitkin; Delta. 



3. Atriplex Wolfii S. Wats. In alkaline soil, in Wyo. and Colo. — San Luis 

 Valley; Saguache. 



4. Atriplex expansa S. Wats. (A. pabularis A. Nels.) In alkaline soil 

 from Ind. Terr, to Mont., Tex. and Calif. — About Fort Collins ; Delta. 



5. Atriplex argentea Nutt. In alkaline flats and dry lakes from N. D. to 

 B. C, Kans. and Colo. — Alt. 4000-5000 ft. — Grand Junction ; Mancos ; Pueblo ; 

 vicinity of Fort Collins. 



6. Atriplex cornuta M. E. Jones. In alkaline soil from Colo, to Utah. — 

 Alt. 4000-6000 ft. — Colorado Springs. 



