CHENOPODIACEAE. 117 



Bracts united to above the middle ; radicle superior. 



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



leaves linear. 3. A. Wolfii. 



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



on the back ; leaf-blades rhombic, cordate or 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. expansa. 

 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. u. 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. cuneata. 



Bracts broadly 4-winged on the back. 



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



Wings thin, sinuately dentate or subentire. 



Wings when fully developed 4-6 mm. wide, distinctly dentate; leaves 



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



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

 linear. 16. A. occidentals. 



1. Atriplex carnosa A. Nels. (A. patula hastata 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. 



