18. S. odòra, Ait. (SWEET GOLDEN-ROD.) _Smooth_ or nearly so throughout; _stem slender_ (2--3° high), _often reclined; leaves linear-lanceolate, entire_, shining, _pellucid-dotted_; racemes spreading in a small one-sided panicle; rays 3--4, rather large.--Border of thickets in dry or sandy soil, Maine and Vt. to Ky., and southward.--The crushed leaves yield a pleasant anisate odor; but an occasional form is nearly scentless. 19. S. tortifòlia, Ell. Stem scabrous-puberulent, 2--3° high; leaves linear, short, commonly twisted, roughish-puberulent or glabrate; rays very short.--Dry soil, coast of Va. and southward. 20. S. pilòsa, Walt. _Stem stout, upright_ (3--7° high), _clothed with spreading hairs; leaves oblong-lanceolate, roughish, hairy beneath_, at least on the midrib, serrulate, the upper ovate-lanceolate or oblong and entire, closely sessile; racemes many, recurved, in a dense pyramidal panicle; rays 7--10, very short.--Low grounds, pine barrens of N. J. to Va. and southward. [=] 5. _Heads small or middle-sized, racemosely paniculate; leaves broad or ample, veiny, at least the lower serrate (or entire in n. 28); involucral scales obtuse._ 21. S. pátula, Muhl. _Stem strongly angled, smooth_ (2--4° high); _leaves_ (4--8´ long) _ovate_, acute, serrate, pale, _very smooth and veiny underneath_, but the _upper surface very rough_, like shagreen; racemes rather short and numerous on the spreading branches; heads rather large.--Swamps; common. 22. S. rugòsa, Mill. _Rough-hairy, especially the very leafy stem_ (1--6° high); _leaves ovate-lanceolate, elliptical or oblong, often thickish and very rugose_; racemes spreading; involucral scales linear; rays 6--9; the disk-flowers 4--7. (S. altissima, _Torr. & Gray_, not _L._)--Borders of fields and copses; very common, presenting a great variety of forms; usually one of the lowest of common _Golden-rods_. It flowers early. Aug.--Sept. 23. S. ulmifòlia, Muhl. _Stem smooth_, the branches hairy; _leaves thin, elliptical-ovate or oblong-lanceolate_, pointed, _tapering to the base_, loosely veined, beset with soft hairs beneath; racemes panicled, recurved-spreading; involucral scales lanceolate-oblong; rays about 4.--Low copses; common.--Too near the last; distinguished only by its smooth stem and thin larger leaves. 24. S. Ellióttii, Torr. & Gray. _Smooth_; stem stout (1--3° high), _very leafy; leaves elliptical or oblong-lanceolate_, acute (2--3´ long), closely sessile, slightly serrate, strongly veined, _thick, smooth both sides, shining above; heads in dense spreading racemes which are crowded in a close pyramidal panicle_; peduncles and achenes strigose-pubescent. (S. elliptica, _Torr. & Gray_, not _Ait._)--Swamps (fresh or brackish) near the coast, Mass. to N. J. and southward.--Heads showy, 3´´ long; the rays 8--12.