196 COMPOSITE. (COMPOSITE FAMILY.) 



*#**#*# Leave,-, entire, those of the stem sessile, the base iften clasping: heads, 

 solitary terminating the branches or somewhat corymbed, large or middle-sized, showy ; 

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

 foliaceous tips, usually more or less glandular or viscid, as are the branchlets, frc. 

 i- Involucre imbricated, the scales in several or many ranks. 



29. A. graildiflorilS, L. Rough urith 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 (!' long) ; achenia hairy. 

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



30. A. OblOllgifolillS, Nutt. Minutely glandular-pubendent, much 

 branched above, rigid, paniculate-corymbose (l-2 high) ; leaves narrowly ob- 

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

 2" -5" wide) ;, scales of the involucre broadly linear, appressed 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. J\ovir-Aiiglia5, L. Stem stout, hairy (3 -8 high), corymbeu 

 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'tt the foliage as in * * *. 



32. A. anoiiialiis, Engelm. Somewhat hoary-pubescent ; stems slcndei 

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

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

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

 several rows, appressed, 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. ORITR6PHIUM, 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. graminifolillS, Pursh. Slightly pubescent, slender (6 '-12' 

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

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

 New Hampshire, about the White Mountains (Mr. Eddy in hei-b. Tuckerman) 

 L. Superior, and northward. 



$ 5. ORTH6MERIS, Torn & Gr. Scales of the involitcre regularly imbricated, 

 unequal, often carinate, with membranaceous margins, entirely destitute, of herbaceous 

 tips : pappus of soft and unequal capillary bristles. 



