104 LEAFLETS. 
i>, A. VILLOSULA. Tufted stems ascending, barely 3 inches 
high, sparingly branched, few-flowered, the internodes quadran- 
gular whitish-villous with long defiexed hairs; leaves thin, 
ascending or spreading, 14 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 River, Wyoming, 13 Aug. 
1881, Dr. W. H. Forwood. Also the same, but less villous, from 
banks of Wind River, 20 July, same year and same collector ; 
all in U. S. Herb. 
16. A. TENERRIMA. 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 14 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 Red Deer River, 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. Dorrit of Nevada and Utah. 
17. A. DEBILIS. 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 very slender and 
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 14 
