GENUS 94. THISTLE FAMILY. 525 
6. Artemisia filifolia Torr. Silvery Worm- 
wood. Tig. 4576. 
Artemisia filifolia Torr. Ann. Lyc. N. Y.2: 211. 1827. 
Shrubby, finely silvery-canescent throughout; stem 
branched, 1°-3° high, the rigid branches nearly erect. 
Leaves 1’-2’ long, nearly all 3-parted into filiform 
entire segments less than 4” wide, or the uppermost 
undivided; heads exceedingly numerous, about 4” 
broad, racemose-paniculate, very short-peduncled, 
3-5-flowered; involucre oblong, its bracts densely 
canescent; receptacle small, naked or slightly fim- 
brillate; central 1-3 flowers sterile. 
On dry plains, Nebraska to Utah, Wyoming, Nevada, 
i Mexico and Arizona. Wormwood-sage. July- 
ct. 
7. Artemisia frigida Willd. Pasture Sage- 
Brush. Wormwood Sage. Fig. 4577. 
Artemisia frigida Willd. Sp. Pl. 3: 1838. 1804. 
Perennial, woody at the base, densely silky-canes- 
cent all over; stem branched or simple, 10-20’ high. 
Leaves 4’-14’ long, ternately or 5-nately divided 
into numerous short acutish mostly entire lobes 
less than 4” wide, the lower and basal ones petioled, 
and often with a pair of entire or 3-cleft divisions 
near the base of the petiole, the upper sessile and 
less divided; heads rather numerous, racemose or 
racemose-paniculate, short-peduncled, nodding, about 
2” broad; involucre hemispheric, its bracts oblong, 
canescent or tomentose; receptacle villous-pubes- 
cent; central flowers fertile. 
On dry plains and in rocky soil, Minnesota to Sas- 
katchewan, Yukon, Idaho, Nebraska, Texas and Ari- 
zona. Wild sage. July—Oct. 
8. Artemisia Absinthium L. Common Worm- 
wood. Absinth. Fig. 4578. 
Artemisia Absinthium L. Sp. Pl. 848. 1753. 
Shrubby, finely canescent; stem much branched, 
2°-4° high. Leaves 2’-5’ long, 1-3-pinnately divided 
into numerous linear to obovate, obtuse lobes, the 
lower long-petioled, the upper short-petioled or ses- 
sile, the uppermost commonly linear and entire; heads 
numerous, yellow, racemose-paniculate, drooping, 
short-peduncled, 2’-24” broad; involucre hemispheric, 
its outer bracts linear, the inner much broader, scari- 
ous-margined; receptacle pilose-pubescent; central 
flowers fertile, the marginal ones pistillate, fertile or 
sterile. 
In waste places, Newfoundland and Hudson Bay to 
Massachusetts, Pennsylvania, North Carolina, western 
Ontario, New York, North Dakota and Montana. Natu- 
ralized or adventive from Europe, mostly escaped from 
gardens. Old English names, madderwort, mugwort, 
mingwort, warmot. Boys’-love. July—Oct. 
