cosiPOsiT^. (composite family.) 211 



4° - C° high. Lower leaves i' - C long. Scales of the involucre oval. Rays 

 about 10. (*) 



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

 leaves oblong-lanceolate, smooth, sharply serrate, acute; the lowest tapering 

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

 short ; scales of the involucre lanceolate, acute ; achenia pubescent. — On the 

 summit of Roan and Hanging Rock Mountains, Korth Carolina, Curtis. Sept. 

 — Stems tufted. Leaves 1' - 3' long. 



* * Racemes l-sided, mostly compound, spreading or recurved {in Kos. 20 and 21 

 ojlen ei-ect), commonli/ disposed in a pyramidal panicle. 



■^ Smooth species, growing in marshes : stems viryate : leaves very numerous, more or 

 less fleshy ; the lowest elongated and tapering into a margined petiole ; the upper 

 small and passing into bracts: heads middle-sized : achenia pubescent. 



19. S. flavovirens, n. sp. 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. — Brackish 

 marshes, Apalachicola, Florida. Sept. — Whole plant yellowish-green. Stem 

 2° - 6° high. Lowest leaves 5' - 10' long, somewhat fleshy, obscurely ribbed. 

 Heads rather large. 



20. S. virgata, Michx. Smooth ; stem slender, rarely branched ; leaves 

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

 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, Florida to Mis- 

 sissippi, and northward. 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 

 rather small, about 10-flowered; rays 5, narrow; scales of the involucre linear, 

 obtuse. — Salt marshes, Florida to North Carolina. Oct. — Stem 2° - 4° high. 



22. S. sempervirens, L. Stem simple, or branched above ; lowest leaves 

 lanceolate-oblong, entire, fleshy, long-petiolcd ; the upper lanceolate, acute, ses- 

 sile or partly clasping ; panicle contracted or pyramidal ; heads rather large ; 

 rays 7-10; scales of the involucre linear, acutish. (S. limonifolia, Pers.) — 

 Salt marshes, Florida, and northward. Sept. and Oct. — Stem 3° - 8° high. 

 Leaves varying in thickness, the lowest 6'- 12' long. 



-I- -I- Stems (smooth) commonli/ branching: leaves not fleshy, serrate, veiny; the 

 lowest ample, tapering into a margined petiole : panicles pyramidal, or racemose 

 on the spreading branches. 



23. S. patula, Muhl. Stem stout, strongly angled ; leaves large, ovate or 

 oblong, acute, very rough above, smooth beneath ; panicles dense, leafy ; pedun- 

 cles pubescent ; rays 6 - 7 ; achenia sparsely pubescent. — Swamps, Georgia, and 

 northward. — Leaves 6' -12' long. 



