coMiMKir.r.. (composite family.) 205 



41. A. Carolinianus, Walt. Stem long and trailing ; the branches and 

 leaves closely pubescent; leaves short, oblong, acute, abruptly contracted into a 

 short auriculate-claspiag petiole ; heads single, or somewhat racemose at the 

 ends of the branches ; scales of the involucre narrow-linear, with recurved subu- 

 late tips; rays slender, pale purple. — River-swamps, Florida to South Caro- 

 lina. — Stem 4° -10° long. Leaves l'-2' long. 



42. A. Novse-Angliae, L. Stem hairy or hispid, corymbose above ; 

 leaves lanceolate, acute, pubescent, scarcely narrowed at the auriculate-clasping 

 base; heads corymhed; scales of the involucre linear-subulate, loosely imbri- 

 cated, viscid ; rays violet-purple. — Upper districts, in low ground, and north- 

 ward. — Stem 2° -4° high, mostly purple. Leaves 2' -3' long. Heads \' or 

 more in diameter, numerous and showy. 



§ 4. Orthomeris. — Scales of the involucre regularly imbricated, scarious on the 

 margins, without herbaceous tips : pappus soft-liairy. 



43. A. acuminatus, Michx. Pubescent; stem erect, corymbose above; 

 leaves large, oblong-lanceolate, acuminate, coarsely serrate, tapering at the base ; 

 heads corymbed, on slender naked peduncles ; scales of the involucre linear- 

 lanceolate ; rays white. — Mountains of North Carolina, and northward. Sept. 

 — Stem 1°- H° high. Leaves thin, 3'- 5' long, strongly veined. 



§ 5. Oxytripolicm. — Scales of the involucre without herbaceous tips, scarious on 

 the margins : pappus soft-hairy : stems smooth and slender : leaves narrow, entire, 

 mostly fleshy. 

 * Perennial : scales of the involucre imbricated in several rows: rays conspicuous. 



44. A. Chapmanii, Torr. & Gray. Stem erect, straight, branched above ; 

 lower leaves long (3' - 9'), linear, spreading, the upper scattered, subulate, erect; 

 heads large, solitary, terminating the slender branches ; scales of the involucre 

 lanceolate, rigid ; rays showy, purple ; achenia smooth, many-ribbed. — Pine- 

 barren swamps, West Florida. Oct. — Stem 2° -3° high. 



45. A. flexuOSUS, Nutt Stem mostly reclining, flexuous, sparingly 

 branched ; leaves fleshy, narrow-linear ; heads few, scattered, terminal, small ; 

 scales of the involucre narrow-linear, very acute, the lower ones smaller and 

 passing into bracts ; achenia slightly hairy, 5-ribbed. — Salt marshes, common. 

 Oct. — Stem l°-3° long. Bays white or pale purple. 



* * Annual: scales of the involucre in 2-3 roics : rays short. 



46. A. linifolillS, L. Stem paniculately much branched ; leaves linear- 

 lanceolate, tapering at each end ; those of the branches linear or filiform, sessile ; 

 heads small, very numerous, in leafy racemes ; scales of the cylindrical involucre 

 linear-subulate, smooth ; rays in two rows, not longer than the disk ; achenia 

 somewhat hairy, 5-ribbed. — "Wet places along the coast, Florida, and north- 

 ward. Oct. — Stem 2° - 3° high. Lowest leaves sharply serrate. 



47. A. divaricatus, Nutt. Stem diffusely branched ; leaves linear-subu- 

 late ; the lowest ones linear, tapering at the base ; heads small, loosely panicled, 

 on spreading peduncles ; scales of the involucre linear-subulate, smooth ; rays 

 in a single row, longer than the disk ; achenia 4 -ribbed, hairy. — Salt marshes, 



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