212 COMTOSIT.-K. (cO.MrOSITK KAMJI.Y.) 



Var. strictula, Ton-. & Gray. Stem simple, or with fuw clojif^atcd rou;^h- 

 pubesccnt l)riin(ln.'.s ; leaves sinalliT; racemes sliort, foniiiii^ a lonj^ and siiiidcr 

 compound raceme. (S. salicina, Jill.) — Swamps, Floritla, and nortliward. 

 Sept. and Oct. — Stem 4° -6° high. 



24. S. arguta^, Ait. Smooth; leaves sharply senate, acute or acuminate 

 at each end, the lowest elli])tical or lanccolate-ohiong, somewliat 3-ril)bed, on 

 winged and ciliate petioles ; the nppcr sessile ; panicle dense, .^omewliat corym- 

 bose ; heads small, crowded, 1 8 - 20-flowcred ; rays 8-12, small; scales of the 

 involucre obtuse ; achenia ncarh' smooth. (S. juncea. Ait., a form witli narrower 

 and less strongly serrate leaves, the upper ones entire.) — Eich soil in the u]>])er 

 districts. Sept. — Stem 2° - 4° high. 



25. S. Boottii, Hook. Stem smooth, or pubescent above ; leaves lanceo- 

 late or oblong, acute or acuminate at each end, appressed-serrate, smooth or 

 more or less pubescent; panicle open, oblong or pyramidal; heads about 12- 

 flowercd ; rays 5 ; scales of the involucre obtuse ; achenia nearly smooth. — Va- 

 ries, with longer, narrower, and more sharply serrate leaves, and slender racemose 

 panicles towards the summits of the spreading branches. (S. juncea? EU.) — 

 Sandy soil, Florida to North Carolina. Sept. — Stem 2° -3° high, often pur- 

 plish. Heads larger and leaves more rigid than in the last. 



2G. S. gracillima, Toit. & Gray. Smooth ; stem slender ; lowest leaves 

 spatulatc-lanccolate, obtuse, serrate near the apex ; the othei-s linear and entire ; 

 heads rather large, 9 - I2-flowcrcd, forming a narrow compound raceme at the 

 summit of the stem and branches ; rays mostly wanting ; scales of the involucre 

 oblong, obtuse; achenia pubescent. — Dry pine barrens, Middle Florida. Oct. 

 — Stem 2° high. 



•(- H- -I- Leaves very numerous, (/niduall^ diminishinr/ in size upward, veinij, sessile, 

 or the lowest mirrowed into a short petiole : heads small. 



27. S. altissima, L. Stem hirsute; leaves ovate or oblong, acute, serrate, 

 rough above, pubescent, especially on the veins beneath, often rugose, promi- 

 nently veined ; panicle leafy, often narrow and elongated; the racemes slender 

 and recurved ; scales of the 10- 15-flowered involucre linear; rays 6-9, small ; 

 achenia pubescent. (S. rngosa, S. ulmifolia, and S. aspera. Ell.) — Low tliick- 

 cts, Florida, and northward. Sept. and Oct. — Stem 2°-6'' bigh, commonly 

 branching. Leaves variable in texture and pubescence, being thin and smoother 

 in shady places, and more rigid, rougher, and often rugose in places more ex- 

 posed. 



28. S. ulmifolia, Muhl. Stem smooth, or softly pubescent above ; leaves 

 ovate-lanceolate, acuminate, serrate, smooth on the upper surface, paler and pu- 

 bescent on the veins beneath ; panicle loose, spreading ; heads about 10-flowered ; 

 rays 4-5; scales of the involucre acutish ; achenia nearly smooth. — Low 

 ground in the upper districts of Alabama, and northward. Sept. — Stem 2° - 3° 

 high. Leaves tliin, 2' -3' long. 



29. S. EUiottii, Torr. & Gray. Smooth ; stem mostly simple ; leaves 

 oblong-lanecolate or elliptical, sessile, acute, finely serrate, the upper often 

 entire; racemes crowded, forming a pyramidal panicle; scales of the 13-20- 



