214 COJU'OSIT.E. (cOJirOSlTE rAMILV.) 



■»- 4- -(- -4- 1- Lfavrs more or less prominetithj 3-ribb((l. 



36. S. nemoralis, .^Mt. rinnt prayish, minutely pul)csccnt and rongh- 

 encd ; stem mostly simple ; leaves obscurely 3-ribbcd ; the lowest spatulate- 

 oblong or lanceolate, serrate ; the upper lanceolate, acute, n!\rro\vtd toward the 

 base, mostly entire ; pauidc dense, oblong or pyramidal, iocurv«d; heads 10- 

 12-flowered ; rays 6-7 ; achenia hairy. — Old fields and opeu wood;;, common. 

 — Stem l°-2° hi-h. 



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

 and roughish; leaves very numerous, smooth, lineai'-laneeolate, entire ; the low- 

 est sparingly serrate; panicle pyramidal; heads rather larjre ; r.iys 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, EIL), 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, sen-ate, 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 senate, rough on the margins ; panicle large, jjyramidal, pubes- 

 cent; ravs small; achenia pubescent. — Margins of fields, &e., Alabama, and 

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



^3. Chrysoma. — Stem shrulhy: leaves impressed-ptinclate, vehiless : rays 1-3: 

 rerejitarle conical, naked. 



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

 leaves spatulate-lanccolate or linear, obtnsc, 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 10-2° high. Leaves l'-2' long. Rays 

 large. 



§ 4. EuTiiAMiA. — Ilerbaceous : leaves narrow, entire, 1 -5-nervcd: heads corym- 

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

 viscid. 



42. S. lanCGOlata, L. Stem pubescent above, coryinlxise ; leaves linear- 

 lanceolate, ri)Uglii>li on the upper surface, pui)escent on the veins beneath, 3-5- 

 nerved ; heads obconical, mostly sessile, in dense clusters ; rays 1.') - 20. — Dump 

 soil, Georgia, and northward. — Stem 2*'-3° high. 



43 S. tenuifolia, I'ursh. Nearly smooth ; stem corymlwscly much 

 branched ; leaves linear, 3-ncrvcd, glandulnr-dotted ; lu-ads few in a cluster, 



