Genus 94. 



THISTLE FAMILY. 



5 3 5 



6. Artemisia filifolia Torr. Silvery Worm- 

 wood. Fig. 4576. 



Artemisia filifolia Torr. Ann. Lye. N. Y. 2: 211. 1827. 



Shrubby, finely silvery-canescent throughout ; stem 

 branched, i-3 high, the rigid branches nearly erect. 

 Leaves 1/-2' long, nearly all 3-parted into filiform 

 entire segments less than I" wide, or the uppermost 

 undivided ; heads exceedingly numerous, about i" 

 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, 

 Texas, Mexico and Arizona. Wormwood-sage. July- 

 Oct. 



8. Artemisia Absinthium L. 



wood. Absinth. Fig. 4578. 



Artemisia Absinthium L. Sp. PI. 848. 1753. 



Shrubby, finely canescent; stem much branched, 

 2-4 high. Leaves 2'-S' 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"-2i" 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. 



7. Artemisia frigida Willd. Pasture Sage- 

 Brush. Wormwood Sage. Fig. 4577. 



Artemisia frigida Willd. Sp. PI. 3: 1838. 1804. 



Perennial, woody at the base, densely silky-canes- 

 cent all over ; stem branched or simple, io'-2o' high. 

 Leaves h'-ii' long, ternately or 5-nately divided 

 into numerous short acutish mostly entire lobes 

 less than J" 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. _ 



Common Worm- 



