CO Ml OSiFAE. 10 1 9 



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, S. Dak. to Utah, south to Tex., Mex. and N. Mex. July- 

 Oct 



7. Artemisia frigida Willd. Pasture Sage-Brush. Wormwood Sage. 

 (I. F. f. 4004.) Perennial, woody at the base, densely silky-canescent all over; stem 

 2.5-5 dm. high. Leaves 1-4 cm. long, ternately or 5-nately divided into numerous 

 short, acutish, mostly entire lobes less than I mm. 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 4 mm. broad; involucre hemi- 

 spheric, its bracts oblong, canescent or tomentose. On dry plains and in rocky soil, 

 Minn, to the Yukon, Idaho, Neb., Tex. and N. Mex. July-Oct. 



8. Artemisia Absinthium L. Common Wormwood. Absinth. (I. F. f. 

 4005.) Shrubby, finely canescent; stem much branched, 6-12 dm. high. Leaves 

 5-12 cm. long, i-3-pinna..eiy divided, the lower long-petioled, the upper short- 

 petioled or sessile, the uppermost commonly linear and entire; heads numerous, 

 yellow, racemose-paniculate, drooping, short-peduncled, 4-5 mm. broad; involucre 

 hemispheric, its outer bracts linear, the inner much broader, scarious-margined; 

 receptacle pilose-pubescent; central flowers fertile, the marginal ones fertile or 

 sterile. In waste places, Newf. and Hudson Bay to Mass., western Ont., Mont, 

 and N. C. Nat. or adventive from Europe. july-Oct. 



9. Artemisia Abrotanum L. Southernwood. (I. F. f. 4006.) Perennial, 

 somewhat shrubby; stem puberulent or glabrous, much branched, 6-12 dm. high, 

 the branches short, erect or ascending. Leaves glabrous or somewhat pubescent, 

 1-7 cm. long, 1-3-pinnately parted into linear, obtuse, entire lobes about I mm. 

 wide, or the uppermost linear and entire, the lowest petioled; heads several- 

 flowered, yellow, very numerous, nodding, 4-5 mm. broad; involucre nearly hemis- 

 pheric, pubescent, its outer bracts lanceolate, acute, the inner ones obovate. In waste 

 places, Mass. to N. C, Ont., and Neb. Adventive from Europe. 



Artemisia procera Willd., a similar species, but with glabrous involucre, is stated by 

 Dr. Gray to have escaped from gardens at Buffalo, N. Y. 



10. Artemisia annua L. Annual Wormwood. (I. F. f. 4007.) Annual, 

 glabrous throughout, much branched, 6-15 dm. high. Leaves 5-15 cm. long; lobes 

 very narrow, short, obtuse; lower and basal leaves slender-petioled, the upper 

 sessile and less divided, but none of them entire; heads very numerous, drooping, 

 borne on very slender peduncles of about their own length or less; involucre hemis- 

 pheric, glabrous, its bracts few, ovate to oblong. In waste places Ont. to D. C, 

 Tenn., Ark. and Kans. ; a bad weed in some places. Adventive or nat. from Asia. 

 Summer. 



11. Artemisia biennis Willd. Biennial Wormwood. (I. F. f. 4008.) 

 Annual or biennial, glabrous throughout; stem very leafy, usually branched, 3-12 

 dm. high, the branches nearly erect. Leaves 2-8 cm. long; lobes linear or linear- 

 oblong, acutish, serrate or incised; lowest leaves petioled, the uppermost less divided 

 or rarely quite entire; heads not drooping, sessile and exceedingly numerous ii axil- 

 lary crowded glomerules; involucre nearly hemispheric, its bracts green, scarious- 

 margined. Native in the N. W. Terr, and the northwestern U. S., now widely 

 distributed as a weed from Manitoba to N. S., south to Kans., Ky. and Penn. 

 Aug. -Oct. 



12. Artemisia Stelleriana Bess. Beach Wormwood. (I. F. f. 4009.) 

 Perennial, densely white-tomentose; stem branched, 3-5 dm. high, bushy, the 

 branches ascending. Leaves obovate to spatulate, 3-10 cm. long, pinnatifid into 

 oblong obtuse entire or few-toothed lobes, the lower petioled, the upper sessile, all 

 densely tomentose beneath, but becoming green and glabrous above when old; 

 heads not drooping; involucre oblong-campanulate, its bracts tomentose, lanceolate 

 or oblong-lanceoiate. Sandy sea-beaches, Me. and Mass. to N. J. Cultivated in 

 gardens along the coast. Native of northeastern Asia. Occurs also on the coast 

 of Sweden. July-Aug. 



13. Artemisia vulgaris L. Common Mugwort. (I. F. f. 4010.) Perennial; 

 stem glabrous or nearly so, much branched, 3-10 dm. high. Leaves 3-12 cm. 



