Genus 88.] 



THISTLE FAMILY. 



463 



4. Artemisia dracunculoides Pursh. 



Linear-leaved Wormwood. 



(Fig. 4001.) 



Artemisia dracunculoides Pursh, PI. Am. Sept. 742. 

 1814. 



Perennial, glabrous; stem somewhat woody, 



usually much branched, 2-4 high, the branches 



nearly erect. Leaves linear, I'-^yi' long, i // -2 // 



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



sometimes 3-cleft or even more divided; heads 



very numerous, i // -i}4 // broad, nodding, very 



short-peduncled, 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 Northwest 

 Territory and British Columbia, south to Nebraska, 

 Texas, New Mexico and California. July-Nov. 



5. Artemisia glaiica Pall. Silky 

 Wormwood. (Fig. 4002.) 



A. glauca Pall.; Willd. Sp. PI. 3: 1831. 1804. 



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

 N. A. 2: 416. 1843. 



Perennial, similar to the preceding species; 

 stems strict, leafy, usually simple or little 

 branched, i-2 high, pubescent, tomentose or 

 canescent, or glabrous below. Leaves linear, 

 Yz'-^Yz' long, about x ff wide, entire, finely and 

 densely pubescent, obtuse or obtusish, or the 

 lower or sometimes nearly all of them 3-cleft 

 into linear lobes \'-\]/ z f long; panicle narrow, 

 branched, its branches nearly erect; heads droop- 

 ing, sessile, very numerous, scarcely more than 



i^ // long; involucre hemispheric, its bracts scarious-margined, obtuse; receptacle naked; 



disk-flowers sterile. y ^0 r? 



Minnesota and Manitoba to the Northwest Territory. 



6. Artemisia filifolia Torr. Silvery 

 Wormwood. (Fig. 4003.) 



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 i / -2 / long, nearly all 3-parted into 

 filiform entire segments less than y^" wide, or the 

 uppermost undivided; heads exceedingly numerous, 

 about y z " 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. July-Oct. 



