[*][*][*] 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.
Head many-flowered; ray-flowers in several rows, narrowly ligulate, pistillate, fertile; disk-flowers with undivided style, sterile. Involucre nearly simple. Receptacle flat. Achenes cylindrical-oblong; pappus copious, soft and capillary.—A low perennial, with horizontal creeping rootstocks, sending up simple scaly scapes in early spring, bearing a single head, and producing rounded-heart-shaped angled or toothed leaves later in the season, woolly when young. Flowers yellow. (Name from tussis, a cough, for which the plant is a reputed remedy.)
T. Fárfara, L.—Wet places, and along brooks, N. Eng., N. Y., and Penn.; thoroughly wild. (Nat. from Eu.)
73. PETASÌTES, Tourn. Sweet Coltsfoot.