201 COMPOSIT.i:. (COMPOSITK lAMII.V.) 



acute herbaceous tips ; rays pale blue or purplish. — Geor;,'ia and Soutli Caro- 

 lina. — Stem l°-4° high. I^caves thiekish, the lowest 5' - 6' long. Heads 

 sometimes 1' in diameter. 



35. A. longifolius, T-um. Stem nearly smooth, corymbosc-panicled 

 above ; leaves long, lanceolate, acuminate, siiining above, the lowest nairowcd 

 at the base, and serrate in the middle, the upper sessile or j)artly clasping; heads 

 solitary or few on the rigid branchlets ; scales of the involucre linear, with green 

 and subulate, or broader and abruptly pointed spreading tips ; rays purplish- 

 blue. — Swamps, Georgia, and northward. — Stem 1^-3° high. Leaves 3' - 6' 

 long. Heads showy. 



3G. A. EUiottii, Torr. & Gray. Stem stout, smooth, very leafy, corym- 

 bose-branched ; the branches short and pubescent in lines ; leaves large, oblong- 

 lanceolate, acute, serrate, narrowed toward the base, and partly clasping ; the 

 lowest spatulate-oblong, obtuse, crcnatc ; heads eorymbed at the ends of the 

 branches ; scales of the involucre subulate, with long and spreading tips ; rays 

 pale purple. (A. puniceus, Ell.) — Swamps, Florida to North Carolina. — 

 Stem 2° -3° high. Leaves 4'- 6' long, or the lowest 1° long. 



37. A. puniceus, L. Stem hispid, panicled above ; leaves lanceolate or 

 oblong-lanceolate, acuminate, sharply serrate, very rough above, nuriculate and 

 clasping at the base ; scales of the involucre linear-subulate, in about two rows ; 

 rays numerous and showy. — Swampy thickets along the mountains of North 

 Carolina, and northward. — Stem 3° -5° high, commonly purplish. Rays 

 violet-purple. 



38. A. prenanthoides, Muhl. Stem pubescent in lines, corymbose at 

 the summit ; haves ovate-lanceolate, acuminate, sharply seirate in the middle, 

 contracted into a broadly winged petiole, which is dilated and clasping at 

 the base, rough above ; scales of the involucre naiTow-linear, imbricated in 

 3-4 rows, with spreading green tips. — Damp woods. North Carolina, and 

 northward. — Stem l°-3° high. Leaves thin, 5' -6' long. Rays pale pur- 

 ple. 



*#****** Leaves lanceolate or ohhng, entire, sessile or clasping : heads 

 large, in conjmhs or racemes: scales of the involucre numerous, with spreading 

 green summits: rai/s numerous, shoici/. 



39. A. grandiflorus, L. Stem rigid, rough with bristly hairs, sparingly 

 branched; leaves small, linear-oblong, sessile, hispid, commonly reflexed ; heads 

 very large, solitary, terminating the branches ; scales of the involucre rigid ; the 

 outer ones with obtuse spreading tips, the inner erect, acute; rays violet. (A. 

 ciliatus, Walt. ?) — Dry soil in the upper districts. — Stem 2° -3° high. Leaves 

 l'-2' long. Heads 1' in diameter. 



40. A. Curtisii, Torr. & Gray. Smooth throughout ; stem simple, slen- 

 der; leaves membranaceous, lanceolate, entire or slightly serrate, acuminate, 

 sessile ; heads in a simple or slightly compound terminal raceme ; scales of the 

 involucre linear-spatulate, coriaceous, the green and spreading tips barely acute ; 

 rays purple. — Mountains of North Carolina. — Stem 2° -3° high. Leaves 

 3'-4'long Heads ^'- 1' in diameter. 



