Genus Sn.] 



THISTLE FAMILY. 



463- 



4. Artemisia dracunculoides Pursli. 



Litiear-leaved Wormwood. 



(Fig. 4001.) 



Arlemisia dracunculoides Piirsh, Fl. \m. Sept. 742. 

 1S14. 



Perennial, glabrous; stem somewhat woody, 

 usually much branched, 2°-4° high, the branches 

 nearly erect. Leaves linear, 1'-},%' long, i"-2" 

 wide, acute, entire, or the lower and basal ones 

 sometimes 3-cleft or even more divided; heads 

 very uuuierous, i"-\}i" broad, nodding, vcr}- 

 short-peduucled, racemose-paniculate; involucre 

 nearly hemispheric, its bracts ovate or oblong, 

 green, scarious-margined; receptacle hemispheric, 

 naked; disk-flowers sterile. 



Dry plains and prairies. Manitoba to the Northwe-st 

 Territory and British Columbia, .south to Nebraska, 

 Texas, New Mexico and California. July-Nov. 



A. 



5. Artemisia glaiica Pall. Silky 

 Wormwood. (Fig. 4002.) 



^. ;?-/aKra Pall.; Willd. Sp. PI. 3: 1S31. 1804. 

 Artemisia dracunculoides war. incana T. & G. Fl.. 

 N. h. 2: 416. 1843. 



/ Perennial, similar to the preceding species; 

 // stems strict, leafy, usually simple or little 

 //^branched, i°-2° high, pubescent, tomentose or 

 ' l// canescent, or glabrous below. Leaves linear, 

 Yz'-'^Yz' long, about \" wide, entire, finely and 

 densely pubescent, obtuse or obtusish, or the 

 lower or sometimes nearly all of them 3- cleft 

 into linear lobes I'-i^^'long; panicle narrow, 

 branched, its branches nearly erect; heads droop- 

 ing, sessile, very numerous, scarcely more than 

 iK" long; involucre hemispheric, its bracts scarious-margined, obtuse; receptacle naked; 

 disk-flowers sterile. \l . ,« rj 



Minnesota and Manitoba to the Northwest Territory. 



6. Artemisia filifolia Torr. Silvery 

 Wormwood. (Fig. 4003.) 



Artemisia filifolia Torr. .\nn. Lye N. Y. 2: 211. 1S27. 



Shrubby, finely silvery-canescent throughout; 

 stem branched, i°-3° high, the rigid branches nearlj' 

 erect. Leaves i'-2' long, nearly all 3-parted into 

 filiform entire segments less than ^" wide, or the 

 uppermost undivided; heads exceedingly numerous, 

 about ,'2" broad, racemose-paniculate, very short- 

 peduncled, 3-5-flowered; involucre oblong, its 

 bracts densely canescent; receptacle small, naked 

 or slightly fimbrillate; central 1-3 flowers sterile. 



On dry plains, Nebraska to Utah, south to Texas, 

 Mexico and New Mexico. Wormwood Sage. Jiily-Oct. 



