GENUS 94. THISTLE FAMILY. 529 
18. Artemisia ludoviciana Nutt. Dark- 
leaved Mugwort. Fig. 4588. 
alrtemisia kidoviciana Nutt. Gen, 2: 143. 1818. 
Perennial, 2°-4° high; stem woolly, branched 
above. Leaves linear to obovate, 3’ long or less, 
white-woolly beneath, at length dark green and 
glabrous, or very nearly so above, the base com- 
monly narrowly cuneate, at least the lower ones 
pinnately lobed or toothed, their lobes lanceolate, 
acuminate; upper leaves often linear and entire; 
heads numerous, spicate-paniculate, 1-13” broad; 
involucre oblong. tomentose; receptacle naked; 
central flowers fertile. 
In dry soil, Missouri to Texas, Wyoming, Colorado 
and Arizona, Aug.-Nov. 
1g. Artemisia mexicana Willd. Mexican Mug- 
wort. Fig. 4589. 
Artemisia mexicana Willd.; Spreng. Syst. 3: 490. 1826. 
Perennial, less densely pubescent than .4. /udoviciana, 
2°-38° high, often branched; stem finely pubescent and 
ultimately often floccose. Leaves ovate or orbicular in 
outline on the lower part of the stem, 233’ long. 
densely white-tomentulose beneath. green above, the 
lobes of the lower and the blades of the upper entire 
ones linear to narrowly linear or nearly so; heads small 
and numerous, usually inclined or nodding; involucre 
campanulate, loosely woolly, the pubescence sparse. 
On prairies. hillsides and barrens. Missouri to Texas. 
Arkansas and Mexico. Sept.—Oct. 
20. Artemisia gnaphalédes Nutt. Prairie © 
or Western Sage. Cud-weed 
Mugwort. Fig. 4500. 
Artemisia gnaphalodes Nutt. Gen. 2: 143. 1818. 
Artemisia ludoviciana var. gnaphalodes T. & G, Fl. 
N. A. a: 420. 1843 
Perennial; stem white-tomentose. usually 
much branched, 1°-4° high. Leaves lanceolate 
or oblong. 1-3’ long, 2”-6” wide, entire, or 
the lower somewhat toothed. or rarely few- 
lobed, white-tomentose on both sides, acute or 
acuminate, sessile or the lower narrowed into 
shart petioles; heads numerous, spicate-panicu- 
late, about 13” broad; involucre oblong, to- 
mentose; receptacle naked; central flowers 
fertile. 
On prairies. plains, and dry banks, western On- 
tario and Illinois to Alberta, Missouri, Texas and 
Mexico. Locally established in waste grounds 
from New Hampshire to Delaware. Far western 
plants formerly referred to this species, which 
consists of many races, are, apparently, distinct. 
34 
