224 COMPOSITE. (COMPOSITE FAMILY.) 



contracted into a short auriculate-clasping petiole ; heads single, or somewhat 

 racemose at the ends of the brandies ; scales of the involucre narrow-linear, 

 with recurved subulate tips ; rays slender, pale purple. River swamps, 

 Florida to South Carolina. Stem 4- 10 long. Leaves l'-2' long. 



39. A. NOVSS- Anglise, L. Stem hairy or hispid, corymbose above ; 

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

 iug base ; heads corymbed ; scales of the involucre linear-subulate, loosely 

 imbricated, viscid; rays violet-purple. Upper districts, in low ground. 

 Stem 2 -4 high, mostly purple. Leaves 2' -3' long. Heads \' or more in 

 diameter, numerous and showy. 



5. OKTIIOMERIS. Scales of the involucre regularly imbricated, scarious on 

 the marc/ ins, without herbaceous tips: pappus simple, soft-hairy. 



40. 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. 



41. A. ptarmacoides, Torr. & Gray. Smooth or scabrous; stems (G'~ 

 15' high) simple ; leaves linear-lanceolate, 1 -3-nerved; heads small, in a flat 

 corymb; scales of the involucre imbricated in 3 or 4 rows, short ; rays white. 

 Northern States. 



Var. Georgianus, Gray. Taller (H-2 high), and more slender, cor- 

 ymbosely branched above ; lower leaves lanceolate, sparingly serrate ; corymb 

 larger and more loosely flowered ; ray flowers sterile, the style short or abor- 

 tive. Mountains of Georgia. Sept. 



6. OXYTRIPOLIUM. Scales of the involucre without herbaceous tips, scarious 

 on the margins : pappus simple, soft-hairy : stems smooth and slender : leaves 

 narrow, entire. 



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



42. A. Chapmani, Torr. & Gray. Stem erect, straight, branched above ; 

 lower leaves long (3'-9'i, linear, spreading, the upper scattered, subulate, 

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

 lanceolate, rigid ; rays showy, purple; achenia smooth, many-ribbed. (A. ex- 

 ilis, Ell. ?) Pine-barren swamps, West Florida. Oct. Stem 2 -3 high. 



43. A. tenuifolius, L. 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. Rays white or pale purple. 



* * Annual: scales of the involucre in 2-3 i-oit-s : rm/s short. 



44. A. SUbulatus, Michx. Stem paniculately much branched ; leaves 

 linear-lanceolate, tapering at each end ; those of the branches linear or fili- 

 form, sessile ; heads small, very numerous, in leafy racemes ; scales of the 

 cylindrical involucre linear-subulate, smooth ; ravs in two rows, not longer 

 than the disk ; achenia somewhat hairy, 5-ribbed. Wet places along the 



