OKDER LXVIII. — CC)MP0SlT.i5. 365 



21 A. Caroltnia'nus, (Walt.) Stem shrubby, flcxuous and decum- 

 bent, much branched, pubescent. Leaves oblon2;-laiK!e()late, sessile, at- 

 tenuate at e:!ch end, pubescent, dilated and aniple.xieaul at the stem. 

 Flowers large, numerous, solitary, on short {)e(luncles ; involucre with 

 pubescent scales ; ray florets numerous. — Purple, t, , Qct. — Nov. In 

 swamps. 8 — 12 feet. 



b. Leaves serrate. Flowers m corymbs. 



22. A. suRCULo'sus, (Mich.) Ste7n erect, simple, pubescent toward 

 the summit. Leaves sessile, lanceolate, glabrous, ciliate -when young, 

 slightly serrate ; upper leaves generally entire. Floivers large, in ter- 

 minal corymbs; involucre with oblong, ovate, pubescent scales, reflex- 

 ed ; ray florets numerous, large. Seeds nearly glabrous. — Purple. If. 

 Oct. — Nov. Car. and Geo. 6 — 11 inches. 



23. A. CuRTis'ii, (T, & G.) Stem smooth, glabrous, simple, leafy, co- 

 rymbose or racemose at the summit ; branches short, bearing a single 

 or few heads. Xmi'^'.s lanceolate, sessile, serrate; involucre hemispher- 

 ical, .=cale8 unequal, imbricate, coriaceous, rays large, 20 or more. Ache- 

 «m glabrous. — Blue or purple. If. N. Car. 2 — 3 feet. 



24. A. pum'ceus, (Ell.) Stem erect, glabrous, shining, brandies striate, 

 pubescent. Leaves spatulate, sessile, clasping, serrate, scabrous on the 

 upper surface, large. Flowers in corymbose panicles, large ; involucre 

 with ciliate, linear reflexed scales ; ray florets numerous, linear-lance- 

 olate. — Purple. If. Oct. — Nov. On the banks of rivers in Sou. Geo. 

 2—3 feet. A. Elliottii, T. k G. 



25. A. DRACiiNcin-oi'oES, (Willd.) Stem erect, with corymbose branch- 

 es marked with a hairy line. Leaves linear, or linear-lanceolate, acu- 

 minate, serrate in the middle, upper ones entire. Flowers small, in co- 

 rymbs; involucre with lanceolate expanding scales. — Nearly white. 2f. 

 8ei)t. — Nov. In low grounds. Upper Car. 



c. Leaves serrate. 



26. A. jun'ceus, (Ait.) Stem erect, with long, slender branches, 

 slightly pubescent. Leaves sessile, linear-lanceolate, serrate, glabrous, 

 upper ones entire. Flowers in racemes; involucre witli linear lanceo- 

 late scales, nearly glabrous; ray florets small, narrow. — Puri)le. If. 

 Sept. — Oct. Damp soils. 2 — 4 feet. 



27. A. diveu'gens, (Ait.) Stem erect, pubescent toward the summit, 

 branching. I^eavcs broad-lanceolate, serrate, glabrous, upper ones en- 

 tire. Flowers in crowded racemes ; involucre with linear-lanceolate, 

 glabrous scales. — White, tinged with purple. 1(. Sept. — Oct. Com- 

 mon. 3 — 4 feet. A. miser, L. 



28. A. tradescan'ti, (L.) Stem erect, glabrous, with numerous vir- 

 gate branches. Leaves lanceolate, serrate, atteimate at each end, up- 

 per ones small, entire. Flowers numerous, in compound racemes ; in- 

 volucre with linear-lanceolate scales ; ray florets numerous, narrow. — 

 Purple. If. Sept. — Oct. Near the mountains. 3 — i feet. 



29. A. versico'lor, (Willd.) Stem erect, branching, glabrous. Leaves 

 broad, lanceolate, amplexicaul, glabrous, serrate in the middle, upper 

 ones entire. Flowers clustered toward the summit of the bratu-hes ; 

 involucre with loose, lanceolate scales. — White or purple Sept. — Oct 

 In damp soils. 2 — 3 feet. 



