212 COMl'OSITyE. (COiirOSlTK l-AMILY.) 



Var. strictula, Ton-. & Gray. Stem simple, or with few elongated roujrli- 

 pubescent branches; leaves smaller; racemes short, forniinrr a long and slender 

 compound raceme. (S. salicina. Ell.) — Swamps, Florida, iuid norihwurd. 

 Sept. and Oct. — Stem 4° - 6° high. 



24. S. arguta, Ait. Smooth ; leaves sharply serrate, acute or acnminate 

 at each end, the lowest elliptical or lanceolate-oblong, somewhat 3-ril)bcd, on 

 winged and ciliatc petioles ; the upper sessile ; panicle dense, somewhat coi-ym- 

 bosc ; heads small, crowded, 1 8 - 20-flowered ; rays 8-12, small; scales of tlie 

 involucre obtuse ; achenia nearly smooth. (S. juncea. Ait., a form with nanower 

 and less strongly serrate leaves, the upper ones entire.) — Rich soil in the upper 

 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, apprcssed-serrate, smooth or 

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

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

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

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

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

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



26. S. gracillima, Torr. & Gray. Smooth ; stem slender ; lowest leaves 

 spatulate-lanceolatc, obtuse, serrate near the apex ; the others linear and entire ; 

 heads rather large, 9- 12-flowered, 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 jiinc barrens, Middle Florida. Oct. 

 — Stem 2° high. 



■*- -f- ■>- Leaves very numerous, (jrndualli/ dimlnishinfj in size vpward, velivj, sessile, 

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



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

 rough a1)ovc, pubescent, especially on the veins beneath, ofien rugose, promi- 

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

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

 achenia ])ubesccnt. (S. rugosa, S. ulmifolia, anil S. aspcra. Ell.) — Low thick- 

 ets, Florida, and northward. Sept. and Oct. — Stem 2° -6° high, commonly 

 branching. Leaves variable in texture and jiubesccncc, 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 sofily pubescent above ; leaves 

 ovate-lanceolate, acuminate, serrate, smooth on the upjicr surface, ])aler and |>u- 

 besccnt on the veins beneath ; j)anicle loose, spreading ; heads about l()-nowcn<l ; 

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

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

 high. Leaves t!;in, 2' -3' long. 



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

 oblong-lanceolato or elli])tical, sessile, acute, finely serrate, the njiper often 

 entire; racemes crowded, forming a jiyraniidal jtaniele ; scales of the 13-20- 



