214 COMPOSITE. (COMPOSITE FAMILY.) 



i- -t- H- 4- t- Leaves more or less prominently 3-ribbed. 



36. S. nemoralis, Ait. Plant grayish, minutely pubescent and rough- 

 ened ; stem mostly simple ; leaves obscurely 3-ribbed ; the lowest spatulate- 

 oblong or lanceolate, serrate ; the upper lanceolate, acute, narrowed toward the 

 base, mostly entire ; panicle dense, oblong or pyramidal, recurved ; heads 10 - 

 12-flowered ; rays 6 - 7 ; achenia hairy. Old fields and open woods, common. 

 Stem l-2 high. 



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

 and roughish ; leaves very numerous, smooth, linear-lanceolate, entire ; the low- 

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

 achenia 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 serrate, rough above, pubescent beneath ; pan- 

 icles pyramidal, dense ; heads small ; rays very short ; achenia pubescent. 

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

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

 ward. Oct. Stem 3 - 8 high. 



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

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

 of numerous recurved racemes ; rays short ; mature achenia 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; achenia pubescent. Margins of fields, &c., Alabama, and 

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



3. CHRTSOMA. Stem shrubby: leaves impressed-punctate, veinless: rays 1-3: 

 receptacle conical, naked. 



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

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

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

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

 to South Carolina. Oct. Stem l-2 high. Leaves l'-2' long. Kays 

 large. 



4. EUTHAMIA. Herbaceous: leaves narrow, entire, l-5-nerved: heads corym- 

 bose : rays more numerous than the disk-flowers : 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- 

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

 soil, Georgia, and northward. Stem 2 -3 high. 



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

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



