WOOTON AND STANDLEY FLORA OF NEW MEXICO. 205 



Range: Arizona to western Texan, southward into Mexico. 



New Mexico : Providencia Lake ( Wooton). Dry plains, in the Lower Sonoran Zone. 



A low shrub, 30 to 70 cm. high, with a peculiar burlike fruit and white-scurfy leaves 



and stems. It occurs in the alkaline flats of the extreme southern part of the State. 



13. Atriplex confertifolia (Torr.) S. Wats. Proc. Amer. Acad. 9: 119. 1874. 

 Obionc conferliJoUa Torr. in Frem. Rep. Exped. Rocky Mount. 318. 1845. 

 Ohione spinosa Moq. in DC. Prodr. IS^: 108. 1849. 



Atriplex spinosa D. Dietr. Syn. PI. 5: 536. 1852. 



Type locality: Borders of the Great Salt Lake, Utah. 



Range: Idaho and Wj^oming to northern Mexico. 



New Mexico: Western McKinley and San Juan counties. Dry plains and lower 

 hills, in the Upper Sonoran Zone. 



A low shrub, seldom more than 50 cm. high, forming dense clumps. Many of the 

 branches end in spinose points. The leaves and stems are dull wliitish-scm-fy . The leaf 

 blades are broadly ovate to almost rotund and are thickly crowded on the branches. 



14. Atriplex collina Woot. & Standi. Contr. U. S. Nat. Herb. 16: 119. 1913. 

 Type locality: Dry hills near the north end of the Carrizo Mountains, northeast 



corner of Arizona. Type collected by Standley (no. 7481). 



Range: Northwestern New Mexico, northeastern Arizona, and western Colorado. 

 New Mexico: Carrizo Mountains. Dry plains, in the Upper Sonoran Zone. 



15. Atriplex sabulosa Jones, Contr. West. Bot. 11: 21. 1903. 

 Type locality: Winslow, Arizona. 



Range: Southwestern Colorado to northern New Mexico and Arizona. 



New Mexico: Farmington; Tiznitziu; Gallup; near Horace; Camzo Mountains; 

 east of Deming. Dry plains and low hills, in the Upper Sonoran Zone. 



A low suffrutescent plant with, generally numerous stems 30 to 50 cm. high. The 

 leaves are broadly obovate or oval, entire, short-petioled, 3 to 5 cm. long or less, and 

 are, like the stems, thickly whitish-scurfy. The plant is browsed more or less by 

 cattle, sheep, and goats. It is very common in alkaline spots in the northwestern 

 part of the State. 



16. Atriplex greggii S. Wats. Proc. Amer. Acad. 9: 118. 1874. 

 Type locality: Cerros Bravos, Mexico. 



Range: Western Texas and southern New Mexico and southward. 

 New Mexico: BnrioMonntaijys (Ilexican Boundary Survey VZlbsi). 



17. Artiplex cuneata A. Nels. Bot. Gaz. 34: 357. 1902. 

 Type locality: Emery, Utah. 



Range : Utah and Colorado to northern Arizona and northwestern New Mexico. 

 New Mexico: Shiprock; Farmington. Dry hills, in the Upper Sonoran Zone. 

 A low shrub about 50 cm. high. 



7. COmSPERMUM L. Bugseed. 



Widely spreading tumbleweeds with linear spinescent-tipped leaves, inconspicu- 

 ous axillary flowers, and peculiar lenticular "buglike" fruit. 



key to the species. 



Spikes slender and lax; lower bracts narrower than the fruit 1. C. nitidum. 



Spikes stout, thick, dense; all the bracts much wider than the fruit. 2. C. marginale. 



1. Corisperinunx nitidum Kit.; Schult. Oesterr. Fl. ed. 2. 1:7. 1814. 



Corisperynwn hyssopifolium microcarpum S. Wats. Proc. Amer. Acad. 9: 123. 1874. 



Type locality: Hungary. 



Range : Illinois to North Dakota, New Mexico, and Texas. 



New JiIexico: Farmingt< n; Willard; ]\Iesilla Valley; Carrizo Mountains. Dry 

 fields, in the Lower and Upper Sonoran zones. 



