526 



COMPOSITAE. 



VOL. III. 



9. Artemisia Abrotanum L. Southernwood. Fig. 4579. 



Artemisia Abrotanum L. Sp. PI. 845. 1753. 



Perennial, somewhat shrubby; stem puberulent or 

 glabrous, much branched, 2-4 high, the branches 

 short, erect or ascending. Leaves glabrous or some- 

 what pubescent, i'-3' long, i-3-pinnately parted into 

 linear obtuse entire lobes about i" wide, or the upper- 

 most linear and entire, the lowest petioled ; heads sev- 

 eral-flowered, yellow, very numerous, nodding, race- 

 mose-paniculate, 2"-2i" broad ; involucre nearly hemi- 

 spheric, pubescent, its outer bracts lanceolate, acute, 

 the inner ones obovate; receptacle glabrous; central 

 flowers fertile. 



In waste places, Massachusetts to western New York, 

 southern Ontario, and Nebraska. Adventive from con- 

 tinental Europe. Old English names, lad's-love, boys'-love, 

 slovenwood, old-man, sweet benjamin. 



Artemisia procera Willd., a similar species, but with 

 glabrous involucre, is recorded as escaped from gardens at 

 Buffalo, N. Y. 



10. Artemisia annua L. Annual Wormwood. 

 Fig. 4580. 



Artemisia annua L. Sp. PI. 847. 1753. 



Annual, glabrous throughout, much branched, 2-5 

 high. Leaves 2 r -6' long, finely 2-3-pinnately dissected 

 into very narrow short, obtuse lobes, the lower and 

 basal ones slender-petioled, the upper sessile and less 

 divided, but none of them entire; heads very nu- 

 merous, about i" broad, drooping, borne on very 

 slender peduncles of about their own length or less; 

 involucre hemispheric, glabrous, its bracts few, ovate 

 to oblong ; receptacle glabrous ; flowers commonly all 

 fertile. 



In waste places, Ontario to New Hampshire, Virginia, 

 West Virginia, Tennessee, Kansas and Arkansas, a bad 

 weed in some places. Adventive or naturalized from 

 Asia. Summer. 



ii. Artemisia biennis Willd. Biennial Worm- 

 wood. Fig. 4581. 



Artemisia biennis Willd. Phytogr. n. 1794. 



Annual or biennial, glabrous throughout; stem very 

 leafy, usually branched, i-4 high, the branches nearly 

 erect. Leaves i'-3' long, i-2-pinnately divided into 

 linear or linear-oblong, acutish, serrate or incised 

 lobes, the lowest petioled, the uppermost less divided 

 or rarely quite entire; heads about ii" broad, not 

 drooping, sessile and exceedingly numerous in axillary 

 glomerules which are crowded, forming a compound 

 spicate inflorescence, the subtending leaves much ex- 

 ceeding the clusters ; involucre nearly hemispheric, its 

 bracts green, scarious-margined ; receptacle naked ; 

 central flowers fertile. 



Native from Tennessee to Nebraska, Manitoba, British 

 Columbia and California, now widely distributed as a weed 

 from Manitoba to Nova Scotia, south to Missouri, Ken- 

 tucky and Delaware. Aug.-Oct. 



