204 coMrosiT.E. (composite family.) 



acute hcibuceou* ti|)s ; rays pale t)liio or purplish. — Gcorjjia and South Caro- 

 lina. —^ Stem l°-4° hi^'h. Leaves thickLsh, the lowest 5' -6' long. Heads 

 sometimes 1' in diameter. 



35. A. longifolius, Lam. Stem nearly smooth, corymbosc-panicled 

 above ; leaves long, lanceolate, acuminate, sliining above, tlic lowest narrowed 

 at the base, and serrate in the middle, the u))per sessile or partly clasping; iicads 

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

 and subulate, or broader <md abruptly pointed spreading ti]w ; rays ptn-j)!ish- 

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

 long. Heads showy. 



36. A. Elliottii, Torr. & Gray. Stem stout, smooth, very leafy, corym- 

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

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

 lowest spatulate-oblong, obtuse, crenatc ; heads corymbcd at the ends of the 

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

 pale purple. (A. puniccus. Ell.) — Swamps, Florida to North Csirolina. — 

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



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

 oblong-lanceolate, acuminate, shai-ply serrate, very rough alx)ve, 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 purjilish. Kays 

 violet-purple. 



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

 the summit ; leaves ovate-laneeolatc, acuminate, sharply serrate in the middle, 

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

 the base, rough above ; scales of the involucre narrow-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 ohlong, entire, sessile or clasping : heads 

 lan/e, in corymbs or racemes : scales of the involucre numerous, with spreadimj 

 green summits: ivi/s mmwous, shoivy. 



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

 branched ; leaves small, linear-oblong, sessile, hispid, commonly rcflc.xcd ; heads 

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

 outer ones with obtuse spreading ti])s, the inner erect, acute; rays violet. (A. 

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

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



40. A. Clirtisii, Toit. & 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-sfiatulnle, coriaceous, the green and spreading tips barely acute; 

 rays purple. — Mountains of Xorlh Carolina. — Stem 2° -3° higli. Leaves 

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



