1*34 COMPOSIT.U. (cOMPOSJTli FAMILY.) 



42 S. Canadensis, 1>. Stem pubescent ami often rough ; leaves lanceo- 

 hiic. iuiite or ai iiniiiiiitc, siiarply norrate, roiigli aijo\e, pHhcsfcnt hcneath ; 

 panicles pvraniidal, dense; heads small; ravs \cry short; achenia ])uiiescent. 

 — ^'ari('S (S. proccra, Kil.), with a more hairv stem, less serrate leaves, the- 

 ujiper entire, and larger heads and ravs. — Margins of fields, etc., Florida, 

 and norlhwanl. Oct. — Stem 3° - 8° higii. ' 



43. S. serotina, .^^it. stem smooth, often j)ur])le; leaves lanceolate, 

 acuminate, serrate, glalirons ; jianicle jiyramidal, of numerous recurved ra- 

 cemes; lays short; mature achenia smooth. — Low ground, Florida, and 

 northward. Oct — Stem stout, 4° -K^ higii. Heads larger than in the last. 



Var. gigantea. (iray. Stem and leaves as in tiie type, hut the latter 

 more or less juiliescent l)eneath, and scabrous above. — With the preceding. 



44. S. rupestris, Haf. Inflorescence sparsely pubescent, otherwise 

 glabrous; sieni biaiuhing, 3° high ; leaves thin, lanceolate, sharply serrate, 

 3'-4' long, faintly riljbed ; panicle leafy ; heads 2" long; rays small. — Kooky 

 river banks, Tennessee. August. 



§3. CiiuvsuMA. — Sti in shntbhij : leaves impressed-punctate, velidess : rays 

 1 - 3 ; recejitacle conical, naked. 

 4.'). S. pauciflosculosa, Michx. Stem, leaves, and involucre viscid ; 

 leaves spatulate-lanceulate or linear, obtuse, entire, tiiQ lowest scalelike; 

 panicle 1-sidcd ; the clusters erect, on naked ])eduncles ; heads 4-7-flowered ; 

 scales of tlie involucre obtuse ; achenia pubescent. — Sandy banks and shores, 

 Florida to South Carcjlina. Oct. — Stem l°-2° high. Leaves 1'- 2' long. 

 Kays large. 



§4. EuTii.v.MiA. — Herbaceous: haves narrow, entire, I - 5-iierred : heads 

 cor 1/ inliose : rays more numerous than the disk Jloicers : receptacle bristly: 

 involiiirc vis.rid. 



46. S. lanceolata, L. Stem pubescent above, corymbose; leaves linear- 

 lanceolate, roilghish on the upper surface, pubescent on the veins beneath, 

 3 - .^-nerved ; heads obconical, mostly sessile, in dense clusters; rays 15-20. 

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



47. S. tenuifolia, Pursh. Nearly smooth ; stem corymbosely much 

 branclicd ; leaves linear, 3-nerved, glandular-dotted ; heads few in a cluster, 

 often pedicelled, top-shaped; rays about 10. — Low sandy places, common. 

 Oct. — Stem 2° high. Heads smaller than those of the preceding. 



21. BIGELOVIA, DC. 



Heads 3- 4-flowored ; the flowers all tubular and perfect. Involucre cylin- 

 drical-club-shapeil, as long as the flowers ; the scales linear, rigid, appressed, 

 somewhat vi.scid. Receptacle narrow^ cuspidate. Achenia terete, striate, 

 hairy. Pajipus simple, of numerous scabrous cai)illary bristles. Styles 

 scarcely exserted. — Smooth erect perennial herbs, with narrow obtuse en- 

 tire leaves, and small heads of yellow flowers, dispo.sed in a compound 

 corymb. 



1. B. nudata, DC. Stem mostly simple, virgate ; lowest leaves spatu 

 late-lanceolate, obscurely 3-nerved ; the others scattered, linear. — Var. vik- 



