242 COMPOSITE, (composite family.) 



» » * Heads in a componml cori/nib terminating the simple stem, not at all racemose: 

 Uuris mostljj Willi a sirorij midrib. 



12. S. ri^ida, L. Row/h and someu-hat hoeni/ with a minute pubescence; 

 Btcm stout (."J" -5° high), very leafy; coiynib dense; leaves oval or oblong, copi- 

 ously feather-veined, thick and rigid ; the upper closely sessile by a broad base, 

 slightly serrate, the uppermost entire ; heads large, about 34-flo\vered ; the rays 

 7-10.— Dry soil, Connecticut to N. Wisconsin and southward. 



13. S. Ohioensis, Hiddell. Very smooth throughout; stem wand-like, 

 slender, leafy (2° -3° high); stem-leaves oblong-laiweolate, Jlut, entire, obscurely 

 fciitiier-veined, closely sessile ; the lower and radical ones elongated, slightly 

 serrate towi.rds the apex, tapering into long margined petioles ; heads numerous, 

 on smooth pedicels, small, 16 -2()-tiowercd ; the rays 6 or 7. — Moist meadows 

 or jn-airies, W. jS'cw York to Ohio and Wisconsin. — Koot-leaves 1° long; the 

 upi>er reduced to l'-2', with rough margins, like the rest. 



■ 14. S. Rlddellii, Frank. Smooth and stout {2° -4° high), mi/ /m^, the 

 branches of the dense corymb and pedicels rough-])ubescent ; leaves linear-lance- 

 olate, eloni/att.d (4' -6' long), entire, acute, partly clasping or sheathing, rowrfw/Vi- 

 late and mostli/ recurved, the lowest elongated-lanceolate and tapering into a long 

 keeled petioie, obscurely 3-nervcd; heads ve^i »iHmc)oi/s, clustered, 20-24-flow- 

 crcd ; the rays 7-9. — Wet grassy prairies, Ohio to Wisconsin and Illinois. — 

 Heads larger than in the last, 2" -3" long. Stem-leaves upright and partly 

 sheathing at the base, then gradually rccurved-spreading. 



15. S. Hought6nii, Torr. & Gray. Smooth; stem rathei- low and slender 

 (l°-2° higii) ; leaves scattered, hnmr-kmceolate, acutish,Jlat, entire, tapering into 

 a narrowed slightly elas|Hng base, or the lower into margined petioles ; heads 

 few or several, 2u - 30-fiowered ; the rays 9 or 10. — North shore of Lake Michi- 

 gan ; collected in the Michigan State Survey. Swamps at West Bergen, Gen- 

 esee Co., New \ork, J. A. Paine, &c. July, Aug. — Leaves rough-margined, 

 2' - 5' long, 2" -4'' wide, 1-ncrved, or the lower obscurely 3-nerved above ; veins 

 obscure. Heads large, nearly ^' long. Scales of the involucre obtuse. 



* * * * Heads in one-sidi d more or less spreiidine) or recurved racemes : leaves veiny, 



not 3-ril)lied, but sometimes obscurely triple-nerved. 

 •»- Leaves thirkish, very smooth, entire, tlongated, obscurely ixiny : heads rather larrje. 



16. S. sempervirens, L. Smooth and stout (l°-6° high) ; leaves fle-liy, 

 lanceolate, sliglitlv clasiting, or the lower ones lanceolate-oblong, obscurely 

 triple-ncnx'd ; racemes short, in an open or contracted panicle. — Vai'ics, in le-s 

 brackish swamps, with thinner elongated linear-lanceolate leaves, taj>ering to 

 each end, and more erect racemes in a narroAver panicle. — Salt marshes, or 

 rocks on the shore, Maine to Virginia. — Heads showy : the golden rays 8-10. 



■*- H- leaves usually ample, serrate, loosely feather-veined, or rarely sll(jhlly tri/ile- 

 vrrvrd: heads middle-sized. 



17. S. eHiptica, Alt. Smooth; stem stout {\° -3° hv^h), very leafy ; leaves 

 elliptical or ohlunij-bninoldle, acute (2' -3' long), closely sessile, slightly serrate, 

 strongly veined, ihich, smooth both sides, shinimj abm-e ; heads in dense sjnrad in ij ra- 

 cemes which are crowelid in a close pyramidal panicle ; jK'iUinclcs aiid achunia stri- 

 gose-j)ubescent. — Swaui]is (fresh or brackish) near the coast, Mass. to New Jer- 

 sey and southward. — Heads showy, 3" long ; the rays 8-12. 



