COMPOSITyE. (COMl'OSrn. FAMILY.) 2(U 



the middle with fine sharp teeth ; smles of the inmlucre narrowly linear, acute 

 or octtlis/i, in 3 or 4 rows. (A. Tradescaiiti, of previous ed.) — Var. fulio- 

 l6sls, Gray, has linear entire loaves, the ascending hranchos with more scat- 

 tered paniculate heads. — Moist banks ; very common. — llcails very numerous, 

 and usually crowded, smaller than in the last. Kays white or nearly so. 



35. A. diffilSUS, Ait. More or less pubescent, much branched; leaves 

 lanceolate or obhmg-lauceolate, tapering or pointed at each end, sharply ser- 

 ritte in the middle; scales of the involucre linear, acute or rather obtuse, imhri- 

 catctl 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 

 ])receding (2-5') ; the involucre intermediate between tlieni.as t(j the form of 

 the .scales. Kays mostly sliort, white or pale bluish-puiide. — Var. TnVRSo- 

 fDEUS, Gray, with ovate-oblong to lanceolate leases, the branches ascending 

 and often short, and the thyrsoid or spicate-'^lomerate heads less socuud. 

 N. Y. to 111. — Var. musuTiCAtJLis, Gray, the slender stem and the midveins 

 of tlie long narrow leaves very hirsute. X. Y. and Ky. — Var. uf fkoxs, Gray, 

 a luxuriant fcrm with large thin leaves and rather larger heads loosely dis- 

 posed on the spreading branches. Ky. to 111. 



^_ .t- -(- -*- Involucre various, the heads when numerous densely or loosely panic- 

 ulate on erect or ascending branches. 

 ■M- Cauline leaves sessile, but the base not cordate nor auriculate (except in forms 

 ofn. 41 ), nor ivinged -petiole-like ; glabrous or nearly so. 



= Heads small or middle-sized ; scales narrow, in several lengths, the erect green 

 tips not ddated. 



36. A. Tradescanti, L. Stem much branched (2-4° high); the nu- 

 merous 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 111. Kays short and narrow, white or purplish. Some forms ap- 

 proach n. 32-34, others differ from A. panlculatus only in the smaller heads 

 and shorter ray. 



37. A. paniculatus, Lam. Stem (2-8° liigh) much branched; the 

 branches and scattered lieads (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. simj)lcx, 

 previous ed.) — Shady moist banks; common. Kays wliite or purplish, 3-4" 

 long. Approaches in its different forms the jireceding and the two following. 

 A slender form with linear leaves, in northern bogs, resembles n. 40. 



38. A. salicif61ius, Ait. Like the la.st; the leaves commonly shorter, 

 firmer, often scabrous, less serrate or entire ; involucre more imbricated, the 

 firmer linear scales with shorter acute or obtusish green tips; heads as large, 

 disposed to be thyrsoid or racemose-clustered ; rays rarely white. (A. carneus, 

 previous ed.) — Low grounds, N. Eng. to Minn., and southward ; most abundant 

 westward. — Var. sl'bAsi'ku, Gray, a rigid scal)rous form, with contracted leafy 

 inflorescence, the broad heads usually leafy-bracteate and the broader scales 

 often obtuse. 111. to Tex. 



