25. S. neglécta, Torr. & Gray. _Smooth_; stem stout (2--4° high), less leafy; _leaves thickish, smooth both sides, opaque; the upper oblong-lanceolate_, mostly acute and nearly entire; the _lower ovate-lanceolate or oblong_, sharply serrate, tapering into a petiole; _racemes short and dense, at length spreading_, disposed in an elongated or pyramidal close panicle; peduncles and achenes nearly glabrous.--Swamps, Maine to Md., Wisc., and Minn.--Heads rather large, crowded; the racemes at first erect and scarcely one-sided. Very variable, the forms approaching n. 16 and 27. Var. linoìdes, Gray. The most slender form; radical leaves 4--8´ long and 4--6´´ wide, the upper very small, erect, branches of panicle rather few, one-sided; rays 2--5. (S. linoides, _Torr. & Gray._)--Mass. to N. J. 26. S. Boòttii, Hook. Smooth, or scabrous-pubescent or below hirsute, slender, often branched, 2--5° high; leaves rather finely serrate, ovate to oblong-lanceolate, pointed; the upper small, oblong to narrowly lanceolate, often entire; heads loosely racemose; rays 1--5 or none; achenes pubescent.--Dry grounds, Va. and southward. 27. S. argùta, Ait. _Smooth; stem angled; leaves_ (large and thin) _ovate_, and the upper elliptical-lanceolate, _very sharply and strongly serrate_ (entire only on the branches), _pointed at both ends_, the lowest on margined petioles; _racemes pubescent, spreading, disposed in an elongated open panicle; rays 6--7, large_; achenes usually glabrous. (S. Muhlenbergii, _Torr. & Gray._)--Copses and moist woods, N. H. to Penn., Ont., and N. E. Minn.--Racemes much shorter and looser than in the next; the involucral scales thin and more slender; the heads somewhat larger, fully 3´´ long. 28. S. júncea, Ait. _Smooth throughout_ (1--3° high); _radical and lower stem-leaves elliptical or lanceolate-oval, sharply serrate_ with spreading teeth, _pointed_, tapering into winged and ciliate petioles; _the others lanceolate or narrowly oblong_, slightly triple-nerved, tapering to each end, the _uppermost entire; racemes dense, naked, at length elongated and recurved, forming a crowded and flat corymb-like panicle; rays 8--12, small_. (S. arguta, _Torr. & Gray._)--Var. SCABRÉLLA, Gray, is somewhat roughish-pubescent (Wisc. to Ky.).--Copses and banks; common. Well distinguished by its long or drooping racemes, and the closely appressed rigid scales of the involucre, small rays, etc. Heads seldom over 2´´ long, the scales small and pale. [++][++] _Leaves more or less plainly 3-ribbed; heads in one-sided spreading or recurved racemes, forming an ample panicle. Not maritime._ [=] _Smooth and glabrous, at least the stem and bright green leaves._ [a.] _Leaves firm and rather rigid; involucral scales thickish, obtuse, quite unequal._