176 DlCOTYLEDONOtJS. 



Flowers in racemes ; involucre with linear-laneeolate scales, nearly glabrous ; 

 ray florets small, narrow. 



Purple. %. Sept. — Oct Damp soils. 2-4 feet. 



28. A. DivERGExs. Stem erect, pubescent towards the summit, branching. 

 Leaves broad-lanceolate, serrate, glabrous, upper ones entire. Flowers in 

 crowded racemes; involucre with linear-lanceolate, glabrous scales. 



White, tinged with purple. %. Sept. — Oct. Common. 3- 4 feet. 



29. A. Tradescanti. Stem erect, glabrous, with numerous, virgate branch- 

 es. Leaves lanceolate, serrate, attenuate at each end, upper ones small, en- 

 tire. Flowers numerous, in compound racemes ; involucre with linear-Lan- 

 ceolate scales ; ray florets numerous, narrow. 



Purple. %-. Sept.— Oct , Near the mountains. 3-4 feet. 



30. A. DiscoiDEus. Stem erect, usually villous, with few erect, virgate 

 branches. Leaves spatulate, coarsely serrate, acute, pubescent. Mowers in 

 long, virgate panicles; involucre with villous, subulate scales; ray florets 

 wanting, those of the disk deeply 5-clefr, 12--15.' Seed glabrous. 



Purple. %. Sept. — Oct. In rich, high lands, northern Ga. 3-4 feet. 



31. A. Versicolor. S/en* erect, branching, glabrous, ieares broad, lan- 

 ceolate, amplcxicaule, glabrous, serrate in the middle, upper ones entire- 

 Flowers clustered towards th3 summit of the branches ; involucre with loose, 

 lanceolate scales. 



White or purple. September — October. In damp soils. 2-3 feet. 



32. A. LiEviGATDS. Stem glabrous, much branched. Leaves broad, lan- 

 ceolate, glabrous, slightly serrate, somewhat amplcxicaule, the upper ones 

 narrower and entire. Flowers in racemose panicles ; involucre with linear- 

 lanceolate scales ; ray florets numerous, linear. Seed pubescent. 



Purple. %. Sept. — Oct. Damp rich soils. 2-4 feet. 



33. A. Amplexicaulis. S^e?nerect,glabrous, somewhat branched. Leaves 

 oblong, lanceolate, acute, amplcxicaule, cordate, serrate, glabrous, the lower 

 more attenuate and less cordate at the base. Flowers in terminal panicles ; 

 involucre with thick, glabrous, lanceolate scales ; ray florets numerous, nar- 

 row. Seed nearly glabrous. 



Purple. %-. Sept.— Oct. In dry soils. 2-3 feet, 

 (e.) Leaves cordate, serrate. 



34. A. Undulatus. Stem erect, scabrous, branching. Leaves oblong, 

 cordate, amplcxicaule, scabrous, somewhat undulate, dentate near the sum- 

 mit. F/oiter,'? in loose, terminal panicles ; involucre with pubescent, linear- 

 lanceolate scales ; ray florets numerous. SeecZs hairy. 



Purple. %-. Sept.— Oct. In dry soils. 2-3 feet. 



35. A. Diversieolius. Stem erect, pubescent, scabrous, much branched 

 towards the summit. Leaves entire or slightly toothed, petioles of the lower 

 leaves winged, amplcxicaule, those of the branches small, pubescent under- 

 neath, scabrous above. Flowers in terminal panicles ; involucre with numer- 

 ous, ciliate, pubescent scales. Seeds slightly angled, hairy. 



Purple. '21-. Sept.— Oct. Common. 2-3 feet. 



36. A. Sagittifolius. Stem erect, glabrous, much branched. Radicle 

 leaves oblong-lanceolate, cordate and sagittate at the base, unequally serrate, 

 glabrous, petiolate ; cauline leaves acuminate, on winged petioles, upper ones 

 oblong, lanceolate, sessile. Flowers in racemes ; peduncles leafy, involucre 

 with lanceolate scales. 



Purple. %.. Sept. — Oct. Upper district Carolina. 2-3 feet. 



37. A. ScABER. Stem erect, striate, scabrous, somewhat hairy. Radicle 

 leaves on long petioles, cordate, with round lobes, acute at the apex ; cauling 

 leaves ovate-lanceolate, or linear-lanceolate, attenuate at the apex, rigid, sca- 

 brous P/oiwers in long, terminal panicles ; involucre with acute, appressed 

 scales, pubescent ; ray florets oval, numerous. SeetZ angled, hairy. 



Purple. '2J-. Sept.— Oct. In dry soils. 2-3 feet. 



38. A. Paniculatus. Stem erect, striate, glabrous, much branched, young 



