230 COMPOSITE. (COMPOSITE FAMILY.) 



15. S. glomerata, Michx. Smooth; stem stout, simple ; leaves large, 

 oblong-lanceolate, acuminate at each end, sharply serrate, the lowest taper- 

 ing into a petiole; racemes cluster-like, much shorter than the leaves; the 

 upper ones approximate and racemose; heads very large, 30 - 40-flowered ; 

 rays 10-12; scales of the involucre acute, smooth ; achenia pubescent 

 High mountains of North Carolina. Sept. Stem l-2high. Leaves 4'- 



9' long. 



t- -t- -t- Racemes corymbose : heads very large. 



16. S. rigida, L. Rough-pubescent and somewhat hoary; stem stout; 

 leaves rigid, oval or oblong, serrate, sessile ; the lowest narrowed into a peti- 

 ole ; corymb compact; heads 30 - 35-flo\vered ; rays 7-10; scales of the 

 involucre oblong, obtuse ; achenia smooth. Mountains of Georgia, and north- 

 ward. Sept. Stem 3- 4 high. Lowest leaves 6' - 9' long. 



17. S. COrymbosa, Ell. Stem erect, smooth; the branches rough- 

 hairy ; lower leaves oblong-lanceolate, the upper ovate ; all fleshy, rigid, 

 smooth, but very rough and fringed along the margin ; racemes corymbose, 

 the lower recurved ; rays long. Upper districts of Georgia and Tennessee. 

 Sept. -Oct. Stem stout, 4 -6 high. Lower leaves 4' -6' long. Heads 

 about 30 flowered. Scales of the involucre oval. Kays about 10. 



18. S. spithamsea, M. A. Curtis. Stem low (8' -12'), rigid, soft-hairy ; 

 leaves obloug-lauceolate, smooth, sharply serrate, acute ; the lowest tnpering 

 into a petiole; corymb dense, compound ; heads 25-30-flowered, rays 6-7, 

 short ; scales of the involucre lanceolate, acute ; achenia pubescent. Moun- 

 tains of North Carolina. Sept. Stems tufted. Leaves 1' - 3' long. 



* * Racemes \-sided, mostly compound, spreading or recurved (in Nos. 20 and 

 21 often erect), commonly disposed in a pyramidal panicle. 



1 -i- Smooth species, growing in marshes : stems virgate : leaves very numerous, 

 more or /ess flesh </ , the lowest elongated and tapering into a margined petiole ; 

 the upper small and passing into bracts: heads middle-sized: achenia 

 pubescent. 



19. S. flavovirens, Chapm. Smooth throughout; stem stout, simple; 

 leaves oblong, obtuse or mucronate ; the lowest serrate, on winged petioles, 

 the upper entire, narrowed at the base; panicle pyramidal; heads 10-12- 

 flowered ; rays mostly 3, showy ; scales of the involucre lanceolate, acutish. 

 Marshes, Apalachicola, Florida. Sept. Whole plant yellowish green. 

 Stem 2 -6 high. Lowest leaves 5 '-10' long, obscurely ribbed. Heads 

 rather large. 



20. S. stricta, Ait. Smooth ; stem slender, rarely branched ; leaves 

 somewhat fleshy, entire ; the lowest oblong-spatulate, sometimes slightly ser- 

 rate, veiny ; the upper very small, lanceolate, appressed ; panicle racemose, 

 erect, or pyramidal, with the lower racemes 1-sided ; heads 12- 16-flowered ; 

 rays 5 - 7 ; scales of the involucre lanceolate, acute. Pine barren swamps. 

 Sept. Stem 3- 5 high. 



21. S. angustifolia, Ell. Smooth; stem slender, simple, or branched 

 above ; leaves fleshy, entire, the lowest lanceolate, the upper linear and acute ; 

 panicle racemose or pyramidal, lower racemes spreading and 1 sided; heads 



