234 COMPOSITE. (COMPOSITE FAMILY.) 



42. S. Canadensis, L. Stein pubescent and often rough ; leaves lanceo- 

 late, acute or acuminate, sharply serrate, rough above, pubescent beneath ; 

 panicles pyramidal, dense ; heads small ; rays very short ; achenia pubescent. 



Varies (S. procera, Ell.), with a more hairy stem, less serrate leaves, the 

 upper entire, and larger heads and rays. Margins of fields, etc., Florida, 

 aud northward. Oct. Stem 3 - 8 high. 



43. S. serotina, Ait. Stem smooth, often purple ; leaves lanceolate, 

 acuminate, serrate, glabrous ; panicle pyramidal, of numerous recurved ra- 

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

 northward. Oct. Stem stout, 4 -8 high. Heads larger than in the last. 



Var. gigantea. Gray. Stem and leaves as in the type, but the latter 

 more or less pubescent beneath, and scabrous above. With the preceding. 



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

 glabrous ; stem branching, 3 high ; leaves thin, lanceolate, sharply serrate, 

 3' - 4' long, faintly ribbed ; panicle leafy ; heads 2" long ; rays small. Hocky 

 river banks, Tennessee. August. 



3. CHRYSOMA. Stem shrubby : leaves impressed-punctate, veinless : rays 

 1 - 3 ; receptacle conical, naked. 



45. S. pauciflosculosa, Michx. Stem, leaves, and involucre viscid ; 

 leaves spatulate-lanceolate or linear, obtuse, entire, the lowest scale-like; 

 panicle 1-sided ; the clusters erect, on naked peduncles ; heads 4 - 7-flowered ; 

 scales of the involucre obtuse ; acheuia pubescent. Sandy banks and shores, 

 Florida to South Carolina. Oct. Stem l-2 high. Leaves 1'- 2' long. 

 Rays large. 



4. EUTHAMIA. Herbaceous: leaves narrow, entire, \-5-nerved: heads 

 corymbose : rays more numerous than the disk flowers : receptacle bristly : 

 involucre viscid. 



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

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

 3-5-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 

 branched ; 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-flowered ; the flowers all tubular and perfect. Involucre cylin- 

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

 somewhat viscid. Receptacle narrow, cuspidate. Acheuia terete, striate, 

 hairy. Pappus simple, of numerous scabrous capillary bristles. Styles 

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

 tire leaves, and small heads of yellow flowers, disposed in a compound 

 corymb. 



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

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



