34. A. vimíneus, Lam. _Smooth or smoothish_, 2--5° high, bushy; leaves linear or narrowly lanceolate, elongated, the larger ones remotely serrate in the middle with fine sharp teeth; _scales of the involucre narrowly linear, acute or acutish_, in 3 or 4 rows. (A. Tradescanti, of previous ed.)--Var. FOLIOLÒSUS, Gray, has linear entire leaves, the ascending branches with more scattered paniculate heads.--Moist banks; very common.--Heads very numerous, and usually crowded, smaller than in the last. Rays white or nearly so. 35. A. diffùsus, Ait. _More or less pubescent_, much branched; _leaves_ lanceolate or oblong-lanceolate, tapering or pointed at each end, _sharply serrate in the middle; scales of the involucre linear, acute or rather obtuse_, imbricated in 3 or 4 rows. (A. miser, of previous ed.)--Thickets, fields, etc.; very common, and extensively variable. Leaves larger than in either of the preceding (2--5´); the involucre intermediate between them, as to the form of the scales. Rays mostly short, white or pale bluish-purple.--Var. THYRSOÍDEUS, Gray, with ovate-oblong to lanceolate leaves, the branches ascending and often short, and the thyrsoid or spicate-glomerate heads less secund. N. Y. to Ill.--Var. HIRSUTICAÙLIS, Gray, the slender stem and the midveins of the long narrow leaves very hirsute. N. Y. and Ky.--Var. BÍFRONS, Gray, a luxuriant form with large thin leaves and rather larger heads loosely disposed on the spreading branches. Ky. to Ill. [+][+][+][+] _Involucre various, the heads when numerous densely or loosely paniculate on erect or ascending branches._ [++] _Cauline leaves sessile, but the base not cordate nor auriculate (except in forms of n. 41), nor winged-petiole-like; glabrous or nearly so._ [=] _Heads small or middle-sized; scales narrow, in several lengths, the erect green tips not dilated._ 36. A. Tradescánti, L. Stem much branched (2--4° high); the numerous heads (2--3´´ high) somewhat panicled or racemed; leaves lanceolate to linear, tapering to a long slender point (2--6´ long), the lower somewhat serrate in the middle; involucral scales linear, acutish, partly green down the back. (A. tenuifolius, previous ed.)--Low grounds, Mass. to Minn., and south to Va. and Ill. Rays short and narrow, white or purplish. Some forms approach n. 32--34, others differ from A. paniculatus only in the smaller heads and shorter ray. 37. A. paniculàtus, Lam. Stem (2--8° high) much branched; the branches and scattered heads (about 4´´ high) loosely paniculate; leaves long-oblong to narrowly lanceolate, pointed, the lower serrate; scales narrowly linear, with attenuate green tips or the outermost wholly green. (A. simplex, previous ed.)--Shady moist banks; common. Rays white or purplish, 3--4´´ long. Approaches in its different forms the preceding and the two following. A slender form with linear leaves, in northern bogs, resembles n. 40.