196 COMPOSITE. (COMPOSITE FAMILY.) 



******* Leave,; entire, those of the stem sessile, the base often 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, §-c. 

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



29. A. grandflflorus, L. Rough with minute hispid hairs : stems slender, 

 loosely much-branched (l°-3° high); leaves very small OJ'-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. OblOilgifdliHS, Nutt. Minutely glandular-puberulent, much 

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

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

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

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

 don County, Porta-!) and Virginia to Wisconsin and Kentucky. — Flowers not 

 half as large as those of the next. 



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

 species. 



-i- +- Involucre of many very slender equal scales appearing like a single row. 



31. A. Novae-Angliae, 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. roscus, Desf), very numerous; achenia hairy. — Moist grounds ; common. 

 — Heads large, corymbed. 



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

 group ; but the foliage as in * * *. 



32. A. SMlomalllS, 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-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. 0RITR6PHIUM, Kunth. — Scales of the involucre narrow, nearly equal and 

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

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



33. A. gramsBlifolius, 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 herb. Tuckerman), 

 L. Superior, and northward. 



$ 5. ORTH6MEEIS, Torr. & Gr. — Scales of the involucre regularly imbricated, 

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

 tips : pappus of soft and v.nequal capillary bristles. 



