196 coMPosiTJE. (composite family.) 



#***##* Leaves entire, these of the stem sessile, the lose often damping : heads 

 solitarif terminating the branches or somewliat corymhed, large or middle-sized, showy ; 

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

 foliaceous tips, usually more or less glandular or viscid, as are the brancJilets, ^c 

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



29. A. g^randifldrns, L. Sough with minute hi^id hairs; stems slender, 

 loosely much-branched (l°-3° high); leaves very smaU (i'-l'long), oblong- 

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

 squarrose many-ranked involucre ; rays bright violet (1' long) ; achenia hairy. — 

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



30. A. OltlongifoliUS, Nutt. Minutely glandular-puberdent, much 

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

 long or lanceolate, mucronate-pointed, partly clasping, thicfcish (1'- 2' long by 

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

 rays violet-pm-ple ; 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 Eastcm Massachusetts, is a still wholly obscure 

 species. 



■*- -1- Involucre of many very slender equal scales appearing like a single row. 



31. A. IV0V8e-Ang:ii8e, L. Stem stout, hairy (3°-8°high), corymhed 

 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 involua-e with leafy tips as in the preceding 

 group ; but the foliage as in * * *. 



32. A. audmaluSj 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-potioled, the upper 

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

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

 Limestone cUffs, W. Illinois (and Missouri), Engdmann. — Heads as large as 

 those of No. 30 : rays violet-purple. 



§ 4. ORITBOPHIUM, 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. gramiuifolius, Pursh. Slightly pubescent, slender (6' -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 {Mr. Eddy in herb. Tuckerman), 

 L. Superior, and northward. 



§ 5. 0RTH6MEEIS, Torr. & Gr. — (Scales of the involucre regularly imbricated, 

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

 tips ! pappus of soft and unequal capillary bristles. 



