COMPOSIT^E. (composite FAMILY.) 241 



involucre leafy, imbricated in several rows ; the innermost smallest, chaff like. 

 Kecejjtacle small, with linear acutisii chaff. Acheuia round or obovate, Hat, 

 broadly winged, 2-toothed or emarginate at the apex. Pappus none, or repre- 

 sented by the two teeth of the achenia. — Tall resinous herbs, with alternate 

 opposite or whorled leaves, and large heads of yellow flowers. 



* Stems terete, neurlij naked : leaves alternate ; the lowest large, serrate or vari- 

 ously lobed, long-petioled ; the others small and scattered. 



1 ■ S. laciniatum, L. Stem hispid or smooth ; leaves very rougli or his- 

 pid, with clasping petioles, }jinnately parted ; the divisions oblong or lanceo- 

 late, acute, lobed or toothed ; heads large, spicate or racemose ; scales of the 

 involucre ovate, tapering into a long and spreading point, ciliate ; achenia 

 round-obovate, emarginate. — Varies with the more numerous sessile and 

 clasping leaves less deeply parted. (S. gummiferum. Ell.) — Prairies of Ala- 

 bama, and westward. July -August. — Stem 6° -8° high. Lowest leaves 

 l°-2^h)ng. Heads 1+'- 2' in diameter. 



2. S. terebinthinaceum, L. Stem smooth, naked above ; leaves 

 rougli-liairy, undivided, cordate-oval or oblong, coarsely serrate, on slender 

 petioles ; heads loosely pauicled ; scales of the involucre oval or obovate, 

 obtuse, smooth; acheuia obovate, emarginate or 2-toothed. (S. pinnatifi- 

 dum, £■//., leaves pinnatifid.) — Open woods in the upper districts of Georgia, 

 and westward. July - Sept. — Stem 4° - 8° high. Radical leaves 2° long. 

 Heads 1' wide. 



3. S. eomposituin, Michx. Smooth ; leaves cordate-ovate or reuiform, 

 angularly toothed or variously lobed, long-petioled ; heads small, corymboselv 

 pauicled ; scales of the involucre obovate or oblong, obtuse ; achenia roundish, 

 deeply emarginate ; rays 6-10. — Sandy open woods, Florida to North Caro- 

 lina. July - Sept. — Stem 3° -6° high. Leaves 6'- 12' long. Heads ^ in 

 diameter. 



* * Steins leaf 11 : leaves undivided, alternate, opposite, or whorled. 



•1- Stems terete. 



4. S. trifoliatum, L. Stem smooth ; leaves rough, lanceolate, slightly 

 serrate, on shm-t bristly petioles ; the upper alternate or opposite ; the lower 

 3-4 in a whorl; heads small, loosely pauicled; scales of the involucre ovate 

 or oval, fringed on the margins ; achenia oblong-ol)ovate, 2-toothed. — Open 

 woods along the mountains of Georgia, and northward. July - Sept. — Stem 

 4° - 6° high. Leaves 4' - 6' long. 



.5. S. Asteriseus, L. Stem smooth or hirsute ; leaves rough, opposite or 

 alternate, or the lower sometimes 3 in a whorl, lanceolate or oblong, toothed, 

 on short hirsute petioles ; the upper sessile and commonly entire ; heads 

 somewhat corymbose, rather large ; extcjrior scales of the involucre ovate, 

 acute, short ciliate ; the interior oblong, obtuse; achenia broadly obovate, 2- 

 toothed. ■ — Var. dentatuji. Lower leaves on rather long petioles, sometimes 

 incisely toothed ; acheuia sligiitly emarginate at the apex. (S. dentatum. 

 Ell.) — Dry open woods, Florida to North Carolina. July -Sept. — Stem 

 2° -4° high. Leaves 3' - 5' long. Rays showy. 



16 



