COMPOSITE. (COMPOSITE FAMILY.) 291 



2. Receptacle, smooth , flowers all fertile, a few pistillate, the others perfect. 



Two cultivated shrubby species, from Europe, with filiformly divided leaves, 

 have occasionallv escaped from gardens and become spontaneous, viz., A. AB- 

 ROTINUM, L. (the SOUTHERNWOOD), of strict habit, with leaves 1 - 2-pimiatifid 

 and pubescent heads, and A. pR6cEKA, L., with more spreading branches, all 

 the leaves finely 2-pinnatifid, and heads glabrous. 



* Tall (1 -5) and branching perennials, whitened with fine and close-pressed 

 icool ; heads small, in leaf;/ panicles. 



6. A. serrata, Nutt. Very leafy, 6-9 high; leaves lanceolate or the 

 upper linear, serrate, white-tomeutose beneath, green above ; heads greenish, 

 oblong, 2" long or less. 111. to Dak. 



7. A. longifblia, Nutt. Stem 2-5 high; leaves linear or linear-lanceo- 

 late, entire, usually glabrate above; heads oblong, canescent, 2 -3" long 

 Minn, to Neb., and westward. 



8. A. Ludoviciana, Nutt. (WESTERN MIJGWORT.) Whitened woolly 

 throughout; leares lanceolate, the upper mostly entire, the lower usually cut- 

 lobed, toothed or pinnatifid, the upper surface sometimes glabrate and green ; 

 heads campanulate, mostly sessile in narrow panicles. Dry banks, Sask. to 

 Mich., 111., Tex., and westward. Very variable. 



A. VTLC.XRIS, L. (COMMON MUGWORT.) Leai^es mostly glabrous and 

 green above, beneath and the branches white-woolly, all pinnatifid, with the 

 divisions often cut-lobed, linear-lanceolate ; heads small in open panicles. 

 Waste places, near dwellings. (Adv. from Eu.) 



* * Densely white-tomentose perennial ; heads large, racemose-glomerate. 



9 A. Stelleriana, Bess. Stout, 1-2 high, from a creeping base; 

 leaves ohovate or spatulate, pinnatifid, the lobes obtuse. Sandy sea-beaches, 

 E. Mass. ; locally nat. from N. E. Asia? 



* * * Less branched (1 -3), biennial or annual, glabrous. 



10. A. biennis, Willcl. Strict, 1 -3 high; lower leaves twice-pinnately 

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

 toothed ; heads in short axillary spikes or clusters, crowded in a narrow and 

 glomerate leafy panicle. Gravelly banks, Ohio to Tenn., Mo., and northwest- 

 ward ; rapidly extending eastward by railroad to Buffalo, Philadelphia, etc. 



A. ANNUA, L. Tall, much branched ; leaves 2-pinuately divided, the oblong 

 segments deeply pinnatifid; heads small, in a loose ample panicle. Ind. to 

 Kan. (Nat. from Old World.) 







3. Receptacle hairy ; flowers all fertile, the marginal ones pistillate. 



A. ABSfNTHiUM, L. (WORMWOOD.) Rather shrubby (2-3 high), silky- 

 hoary ; leaves 2 - 3-pinnately parted, lobes lanceolate ; heads hemispherical, 

 panicled. Roadsides, escaped from gardens. (Adv. from Eu.) 



1 1 . A. frigida, Willd. Low (6 - 20' high), in tufts, slightly woody at the 

 base, white-silky ; leaves pinnately parted and 3 - 5-cleft, the divisions narrow- 

 linear; heads globose, racemose. Dry hills and rocks, Sask. to Minn., W. 

 Tex., and westward 



72. T US SI LA GO, Tourn. COLTSFOOT. 



Head many -flowered , ray-flowers in several rows, narrowly ligulate, pistil- 

 late, fertile ; disk-flowers with undivided style, sterile. Involucre nearly simple. 

 Receptacle flat. Achenes cylindrical-oblong ; pappus copious, soft and capil- 



