§ 2. _Receptacle smooth; flowers all fertile, a few pistillate, the others perfect._ Two cultivated shrubby species, from Europe, with filiformly divided leaves, have occasionally escaped from gardens and become spontaneous, viz., A. ABRÓTINUM, L. (the SOUTHERNWOOD), of strict habit, with leaves 1--2-pinnatifid and pubescent heads, and A. PRÒCERA, 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 wool; heads small, in leafy panicles._ 6. A. serràta, Nutt. Very leafy, 6--9° high; leaves lanceolate or the upper linear, serrate, white-tomentose beneath, green above; heads greenish, oblong, 2´´ long or less.--Ill. to Dak. 7. A. longifòlia, Nutt. Stem 2--5° high; leaves linear or linear-lanceolate, entire, usually glabrate above; heads oblong, canescent, 2--3´´ long--Minn. to Neb., and westward. 8. A. Ludoviciàna, Nutt. (WESTERN MUGWORT.) _Whitened woolly_ throughout; _leaves 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., Ill., Tex., and westward. Very variable. A. VULGÀRIS, L. (COMMON MUGWORT.) _Leaves 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. Stelleriàna, Bess. Stout, 1--2° high, from a creeping base; leaves obovate 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. biénnis, Willd. 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 northwestward; rapidly extending eastward by railroad to Buffalo, Philadelphia, etc. A. ÁNNUA, L. Tall, much branched; leaves 2-pinnately 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. ABSÍNTHIUM, 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.) 11. A. frígida, 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. TUSSILÀGO, Tourn. COLTSFOOT.