214 comtosita:. (( (mrosiric iamily.) 



■t- -t- ■*- -t- t- Ijenvrx more or less prominently H-rilJyed. 

 3f). S. nemoralis, Ait. riant pniyish, nnimtcly j)ul)es<ont find ronph 

 cned ; stem iikiniIv siinjilo ; leaves ohscurely 3-ril>l)i'd ; tlie lowest spntulatc- 

 oldong or laiurolate, senate ; the upper laneeolate, acute, narrowed toward the 

 base, mostly entire ; panielc dense, oblonj; or ])yraniidal, reeurved ; heads 10- 

 12-flowered ; rays 6 - 7 ; aehenia liairy. — Old liekls and open woods, common. 

 — Stem l°-2° high. 



37. S. Leavenworthii, Torr. & Gray. Stem simple, minutely pubescent 

 and roujihish ; leaves very numerous, smooth, linear-laneeolate, entire ; the low- 

 est sparingly serrate; panielc pyramidal; heads rather large; rays 10-12; 

 aehenia pubescent. — Damp soil, Florida to South Carolina. Oct. — Stem 2°- 

 3° high. Leaves 2' -3' long, 3" -4" wide, faintly ribbed. 



38. S. Canadensis, L. Stem pubescent and often rough ; leaves lanceo- 

 late, acute or acuminate, sharply sen-atc, rough above, pubescent beneath ; pan- 

 icles pvramidal, dense ; heads small ; rays very short ; aehenia pulx-scent. — 

 Varies (S. procera. Ell.), with a more hairy stem, less serrate leaves, the upper 

 entire, and larger heads and rays. — Margins of fields, &e. Florida, and north- 

 ward. Oct. — Stem 3C - 8° high. 



39. S. serotina, Ait. Stem smooth, often purple ; leaves laneeolate, acu- 

 minate, serrate, rough above, pubescent on the veins beneath ; panicle pyramidal, 

 of numerous recurved racemes; rays short; mature aehenia smooth. — Low 

 ground, Florida, and northward. Oct. — Stem stout, 4° -8" high. Heads 

 larger than in the last, but smaller than those of the next species. 



40. S. gigantea, Ait. Stem smooth ; leaves smooth, lanceolate, acumi- 

 nate, sharply serrate, rough on the margins; panicle large, pyramidal, pubes- 

 cent; rays small; aehenia pubescent. — Margins of fields, &c., Alabama, and 

 northward. Sept. and Oct. — Stem 2° - 6° high. 



§3. Chkysoma. — Stem shruhby: leaves impressed-punctate, veinless : rai/s 1-3: 

 receptacle conical, naked. 



41. S. pauciflosculosa, Miehx. Stem, leaves, and involucre viscid; 

 leaves spatulate-lanceolate or linear, obtuse, entire, the lowest scale-like; pani- 

 cle 1-sidcd ; the clusters erect, on naked peduncles ; heads 4 -7-flowered ; scales 

 of the involucre obtuse ; aehenia pubescent. — Sandy banks and shores, Florida 

 to South Carolina. Oct. — Stem 10-20 high. Leaves l'-2' long. Rays 

 large. 



§ 4. EuTiiAMlA. — Herbaceous : leaves narrow, entire, 1 - 5-nerved : heads corym- 

 bose : rays more numerous than the disk-Jlowers : receptacle bristly : involucre 

 viscid. 



42. S. lanceolata, L. Stem pubescent above, corymbose ; leaves linear- 

 lanceolate, roughish on the upper surface, pubescent on the veins beneath, 3-5- 

 ncrved ; heads obconical, mostly sessile, in dense clusters ; rays 15-20. — Damp 

 soil, Georgia, and northward. — Stem 20-3° high. 



43. S. tenuifolia, Piirsh. Nearly smooth ; stem corymbosely much 

 branched ; leaves linear, 3-nerved, glandular-dotted ; heads few in a cluster, 



