204 COMPOSITE. (COMPOSITE FAMILY.) 



acute herbaceous tips ; rays pale blue or purplish. Georgia and South Caro- 

 lina. Stem l-4 high. Leaves thickish, the lowest 5' -6' long. Heads 

 sometimes 1' in diameter. 



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

 above ; leaves long, lanceolate, acuminate, shining above, the lowest narrowed 

 at the base, and serrate in the middle, the upper sessile or partly 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. 



36. A. Elliottii, 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, crenate ; heads corymbed 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, auriculate 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 ; leaves ovate-lanceolate, 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 oblong, entire, sessile or clasping: heads 

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

 green summits : rays numerous, shouoy. 



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 

 1' - 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 ' - }' in diameter. 



