196 COMPOSITE. (COMPOSITE FAMILF.) 



******* Leave,', entire, those of the stem sessile, the base ift.cn clasping: heads 

 solitary t<riitinatin</ the branches or somewhat corymbed, hi rye or middlc-sizid, showy ; 

 scales of the involucre very numerous, with loose and spreading or recurved nmthl 

 foliaceous tijis, usually more, or l<ss glandular or viscid, as are the. branchlets, fro> 

 *- Involucre imbricated, the scales in several or main/ ran/cs. 



29. A. grailclifloi'US, L- Rough with minute hispid hairs ; stems slender 

 loosely much-branched (l-3 high); leaves very small ('-!' long-), oblong- 

 linear, obtuse, rigid ; the uppermost passing into scales of the hemispherical 

 squarrose many-ranked involucre; rays bright violet (!' lung) ; achenia hairy. 

 Dry open places, Virginia and southward. Heads lurgu and very showy. 



30. A. obBoilgifoIillS, Nutt. Minutely glandular-puberulent, much 

 branched above, rigid, paniculate-corymbose (1- 2 high) ; haws narrowly ob- 

 long or lanceolate, mucronate-pointed, partly clasping, thickish (l'-2'long by 

 2" -5" wide); scales of the involucre broadly linear, apprcssed at the base; 

 rays violet-purple; achenia canescent. Banks of rivers, from Penn. (Hunting- 

 don County, Porter!) and Virginia to Wisconsin and Kentucky. Flowers not 

 half as large as those of the next. 



A. AMETHYSTINUS, Nutt., of Eastern Massachusetts, is a still wholly obscure 

 species. 



*- Involucre of many very slender equal scales appearing like a single row, 



31. A. Novee-AngliiB, L. Stem stout, hairy (3 -8 high), corymbed 

 at the summit ; leaves very numerous, lanceolate, entire, acute, auriculate-clasping, 

 clothed with minute pubescence : scales of the involucre linear-awl-shaped, loose, glan- 

 dular-viscid, as well as the branchlets ; rays violet-purple, sometimes rose-purple 

 (A. roseus, Desf.), very numerous ; achenia hairy. Moist grounds ; common. 

 Heads large, corymbed. 



******** Head and imbricated involucre with leafy tips as in the preceding 

 group ; b\it the foliage as in * * *. 



32. A. an6malus, Engelm. Somewhat hoary-pubescent ; stems slender 

 (2 -4 high), simple or racemose-branched above; leaves ovate or ovate-lance- 

 olate, pointed, entire or nearly so, the lower cordate and long-petioledj the upper 

 small and almost sessile ; scales of the hemispherical involucre imbricated in 

 several rows, apprcssed, with linear spreading leafy tips; achenia smooth. 

 Limestone cliffs, W. Illinois (and Missouri), Engelmann. Heads as large as 

 those of No. 30 : rays violet-purple. 



4. ORITROPPIIUM, Kunth. Scales of the involucre narrow, nearly equal and 

 almost in a single row, more or less herbaceous: pappus of soft and uniform capil- 

 lary bristles : mostly low perennials, bearing solitary or few heads. 



33. A. gramillifolillS, Pursh. Slightly pubescent, slender (G'-12 

 high) ; leaves very numerous, narrowly linear; branches prolonged into slender 

 naked peduncles, bearing solitary small heads; rays rose-purple or whitish. 

 New Hampshire, about the White Mountains (Mi: Eddy in herb. YV/k //////), 

 L. Superior, and northward. 



$5. ORTH6MEIUS, Ton-. & . (.}r. ft-,,/ <>f the, tnvdaare r//////a/7.y imbricated, 



une<ji>a', o/'f, i: carinate, /nrh mfmbraiiaf,-ous /tinn/his, eitii </// ust/lnte <>/' /rUiccOUa 

 tips : paj>j>ns of soft and i niqnal capillary bristles. 



