104 LEAFLETS. 



lo. A. viLLOSULA. Tufted stems ascending, barely 3 inches 

 high, sparingly branched, few-flowered, the internodes quadran- 

 gular whitish-villous with long deflexed hairs ; leaves thin, 

 ascending or spreading, IJ inches long, oblanceolate-elliptic, 

 acute, clothed above with a minute but rather harsh pubescence, 

 beneath especially along the midvein hirsutulous, the margin 

 uncinate-hispidulous : pedicels long, little or not at all surpass- 

 ing the foliage, villous but not glandular : calyx with hirsutu- 

 lous tube and deltoid acute teeth. 



Dry rocky beds of the Gros Ventre Eiver, Wyoming, 13 Aug. 

 1881, Dr. W. H. Forwood. Also the same, but less villous, from 

 banks of Wind Eiver, 20 July, same year and same collector ; 

 all in TJ. S. Herb. 



16. A. TBNERKiMA. Very slender, with thin and delicate 

 light-green foliage and long filiform branches and pedicels, the 

 whole commonly 8 or 10 inches high and upright or ascending : 

 stems quadrangular, above sparsely beset with minute spreading 

 gland-tipped hairs, the lower internodes retrorsely villous : leaves 

 mostly IJ to 2 inches long, ascending, oblanceolate to nearly 

 elliptic, very acute, sparsely and minutely retrorse-aculeolate on 

 midvein beneath and on margin ; pedicels and calyx hirtellous 

 and glandular, the latter narrowly turbinate, cleft deeply, the 

 teeth triangular-lanceolate, acute. 



Medicine Hat, Assiniboia, J. M. Macoun, June, 1894, n. 3090, 

 Herb. Geol. Surv.; also by the same on Eed Deer Eiver, Alberta, 

 1881, and young specimens at Blackfoot Crossing, Alberta. In 

 slender habit, delicate herbage and scanty pubescence, this far 

 northern plant invites comparison with the still very dissimilar 

 A. Dorrii of Nevada and Utah. 



17. A. DBBiLis. Much branched from the base and low, 

 young plants beginning to flower only 3 or 4 inches high, very 

 leafy and deep green, the stems and branches verj slender imd 

 weak, obviously if not sharply quadrangular and retrorsely 

 aculeolate, only the short lowest internodes somewhat villous 

 retrorsely: leaves narrowly lanceolate to lance-linear, 1 to 1} 



