COMrosiTyi:. (coJirosiTE fa:mily.) 2G7 



kcd. Achcnia obovoid, with a small sumniit and no pappus. — Ilcrhs or shrubby 

 plants, bitter and aromatic, wit li small heads in ijaniili-d sjiikes or racemes; 

 flowering in summer. Corolla yellow or j)urplisb. (Dedicated to Artemis, the 

 Greek Diana.) 



§ 1. Rcciptadv smooth : vmrgiiial jlowers jiistillate. and f(rtll<: : dis/c-Jluwers jKrfcct but 

 stcrili' : riMit jierennial, except in \o. 4. 



1. A. dracunculoides, Tursh. Tall (.•3° -5°), somewhat woody at base, 

 slightly hoary or glabrous; Imves linear and entire or the lower 3-cleft ; Jtexids 

 small and uiimeroiis, jjanicled. — Sandy banks of streams, S. W. Illinois {Dr. 

 T use)/, Dr. Mead) and westward. 



2. A. bore^lis, Pallas. Low (3'-f)' high), tufted, silky-villous or nearly 

 smooth ; loiver leaver 3 - Ty-chjl at the ajxix, or like the others 1 - 2-pinnatelij parted, 

 the, lobes lanceolate or linear; heads few, liemispherieal, pretty large, spiked or 

 racemal. — Shore of Lake Superior, and northward. (Eu.) 



.3. A. Canadensis, Michx. Smooth, or hoary with silky down (lO-S® 

 high) ; lower leaves twiee-pinnately divided, the upjier 3 - 7-divided ; the divisions 

 linear, rather rigid ; heads rather large, in punicltd racemes. — Shore of all the (Jreat 

 Lakes, &c., and northward. (En.) 



4. A. caud^ta, Miehx. Smooth {2° -5° high) ; upper leaves pinnatcly, 

 the lower 2 -3-pinnatcly divided ; the diiusions thrcad-'lrm, diverging ; heads stmdl, 

 the racemes in a wand-like elongnted panicle ; root bieni ial. — Sandy soil, coast of 

 Kew Hampshire to Virginia; also Michigan and Illinois. 



§ 2. Recpptade smooth: flowers all fertile, a few pistillate, the others perfect. 



♦ Tall (l°-5°) and hnnichini/ perennials, whitened with fine and close-pressed wool : 



h"iid-i small, oroid, crowded in leafy panicles. 



5. A. Ludovicikna, Nntt. (Western Mugwoist.) Whitened icoolly 

 throughout ; leaves lanciolnte, the upper mostly entire, the lower cut-lobed, toothed 

 or j)innatifid; ht'ads larger than in the next, mostly sessile in narrow })anicles. 

 — Dry banks, Lukes Huron and IMiehigan, and sonthwestward ; esj>ecially the 

 var. (iXAi'HAi-oDES, wliieli has the elongated nearly entire leaves very woolly 

 both sides. 



6. A. vulcVris. L. (Commox Mitgwort.) T.pnves mostli/ glabrous and 

 green above, beneath and the branches white-woolly, all jjinnatifid, with tiie divi- 

 sions often cnt-lobed, lineir-lanceolatc ; heads small in open panicles. — Waste 

 places, near dwellings. (Adv. from Kii.) 



* * />.« branched (l°-3°) biennial or annual, glabrous: heads dcnseli/ clustered. 



7. A. biennis, Willd. (Biennial Wormwood.) Lower leaves twiec- 

 pinnately parted, the upper pinnatifid ; lobes linear, acute, in the lower leaves 

 cut-toothed ; heads in short a.xillary sj)ikes or clusters, crowded in a narrow and 

 glomerate leafy panicle. — Gravelly banks, Ohio to Illinois, and northwestward ; 

 rapidly extending eastward l>y railroad to liutValo, riiiladelpliia, &e. 



§ 3. Receptacle hairy ; flowers (dl fertile, the marginal ones pistillate : heads nodding. 



8. A. AusfNTHiLM, L. (Common Wormwood.) Rather shrubby (2°- 

 4°high), silky-lumry ; leaves 2- 3-piunately parted, lobes lanceolate ; heads liemi- 

 spherieal, panieled. — lloadsides, .sparingly escaped from gardens. (Adv. from 



