182 
BOTAKY. 
pale greenish shrub, witli ragged fibrous bark and a strong aromatic smell, 
the sage-brush ",_of the [West, covering hundreds of square miles in the 
plains and on the foot-hills of Nevada and Utah, found more sparingly in the 
mountains to their summits, and extending from Oregon to Arizona, and as 
far east as the mountains of Colorado ; 4-10,000 feet altitude ; Septem- 
ber. (635.) 
Aetemisia arbuscula, Nutt. Dwarf, shrubby, canescent ; stems 3-6' 
high ; leaves narrowly cuneate, 4-5" long, deeply 3-cleft, the side divisions 
often 2-3-lobed ; heads ovoid, sessile singly or in small clusters along a sim- 
ple or sparingly-branched rachis ; involucre of oval tomentose imbricated 
scales, the outer ones shortest, inner more scarious ; florets about 8, ah per- 
fect and fertile, the corollas a little more slender than in the last, and the 
styles similar.— Arid plains of Snake River, (Nuttall ;) Colorado, (Vasey, 
308.) On a peak in the East Humboldt Mountains ; 9,000 feet elevation ; 
August. (636.) 
Artemisia teifida, Nutt. Shrubby, 6-18' high, canescent; leaves 
narrowly cuneate, 3- or rarely 4-5-cleft, the lobes linear or oblong, obtuse ; 
heads narrowly obovoid, arranged in small peduncled clusters forming a nar- 
row elongated panicle ; involucral scales imbricated ; the outer scales oval, 
tomentose ; inner ones obovate, scarious ; florets about 3, all perfect and fer- 
tile ; corollas and styles as in the last.— A taller and more slender plant than 
A, arhuscida, with more compound inflorescence, narrower heads, and fewer 
florets— 3 in all the heads examined, though said to be 8 by Torrey and 
Gray; possibly a misprint; for Nuttall says of ^. arhuscula, Capituh twice 
as large "as in A. tnfida. Washington Territory; Oregon and California. 
Scattered throughout Northern Nevada, often in company with A. tridentata, 
which it greatly resembles in habit, though smaller, and sometimes itself 
covering large areas ; 5-8,000 feet elevation ; August, September. (637.) 
Artemisia potentilloides, Gray. Froc, Amer. Acad., 6. 551. Silky- 
canescent, many-stemmed from a perennial woody caudex ; stems herbaceous ; 
9-12' high ; radical and lower leaves 2-3' long, 2-3-pinnately cleft, the nu- 
merous linear divisions 2-4" long and J" wide; upper leaves gradually 
smaller, simply pinnatifid with linear obovate divisions ; uppermost simple and 
bract-like ; heads 3-6, corymbose, hemispherical, 3-4" broad ; involucre cup- 
shaped, of about 10 equal ol)ovate scales with hyaline edges; receptacle con- 
vex, very liirsute ; florets exceedingly numerous, all ahke, perfect and fertile; 
