526 



COMPOSITAE. 



VOL. III. 



g. 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 \" 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. 



I7S3- 



Annual, glabrous throughout, much branched, 2-5 

 high. Leaves 2'-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. 



