366 ORDER LXVIII. COMPOSITE. 



30. A. l^eviga'tus, (Pursh.) Stem glabrous, much branched. Leaves 

 broad, lanceolate, glabrous, slightly serrate, somewhat amplexicaul, 

 the upper ones narrower and entire. Flowers large, in racemose pani- 

 cles ; involucre with linear-lanceolate scales; ray florets numerous, 

 linear. Seed pubescent. — Purple. If. Sept. — Oct. Damp rich so Is. 

 2 — 4 feet. A. Novi-Belgii, L. 



31. A. amflexicau'lis, (L.) Stem erect, glabrous, somewhat branched. 

 Leaves oblong, lanceolate, acute, amplexicaul, cordate, serrate, gla- 

 brous, the lower more attenuate and less cordate at the base. Flowers 

 in terminal panicles ; involucre with thick, glabrous, lanceolate scales ; 

 ray florets numerous, narrow. Seed nearly glabrous. — Purple. 2f. 

 Sept.— Oct. In dry soils. 2—3 feet. 



d. Leaves cordate, generally serrate. 



32. A. undula'tus, (L.) Stem erect, scabrous, branching. Leaves 

 oblong, cordate, amplexicaul, scabrous, somewhat undulate, dentate 

 near the summit. Flowers in loose, terminal panicles; involucre with 

 pubescent, linear-lanceolate scales ; ray florets numerous. Seeds hairy. 

 —Purple. If. Sept.— Oct. In dry soils. 2— 3 ft. A. patens, Ait. 



33. A. diversifo'lius, (Mich.) Stem erect, pubescent, scabrous, much 

 branched toward the summit. Leaves entire or slighlly toothed, petioles 

 of the lower leaves winged, amplexicaul, those of the branches small, 

 pubescent underneath, scabrous above. Flowers in terminal panicles; 

 involucre with numerous, ciliate, pubescent scales. Seeds slightly an- 

 gled, hairy. — Purple. If. Sept. — Oct. Common. 2 — 3 feet. 



A. undulatus. 



34. A. sagittifo'lius, (Ell.) Stem erect, glabrous, much branched. 

 Radical leaves oblong-lanceolate, cordate and sagittate at the base, une- 

 qually serrate, glabrous, petiolate ; cauline leaves acuminate, on wing- 

 ed petioles, upper ones oblong, lanceolate, sessile. Floivers in racemes ; 

 peduncles leafy, involucre with lanceolate scales. — Purple. 2f. Sept. 

 — Oct. Upper district of Carolina. 2 — 3 feet 



35. A. sca'ber, (Ell.) Stem erect, striate, scabrous, somewhat hairy. 

 Radical leaves on long petioles, cordate, with round lobes, acute at the 

 apex; cauline leaves ovate-lanceolate, or linear-lanceolate, attenuate 

 at the apex, rigid, scabrous. Flowers in long, terminal panicles; invo- 

 lucre with acute, appressed scales, pubescent ; ray florets oval, numer- 

 ous. Seed angled, hairy. — Purple. 2f. Sept. — Oct. In dry soils, 

 z— 3 feet. 



36. A. panicula'tus, (Muhl.) Stem erect, striate, glabrous, much 

 branched, young branches pubescent. Leaves ovate-lanceolate, acute, 

 slightly pubescent along the margins and veins, petiolate. Flowers in 

 compact, racemose panicles; involucre with numerous, subulate scales; 

 ray florets narrow, about 12. Seeds glabrous. — Purple. If. Sept. 

 — Oct. In rich soils. 3 — 4 feet. A. sagittifolius, Willd. 



37. A. cordifo'lius, (L.) Stem erect, with pubescent branches. Rad- 

 ical leaves cordate, attenuate at the apex, serrate, on slightly winged 

 petioles, pubescent beneath. Flovjers in racemose panicles, numerous; 

 involucre with linear-lanceolate scales, slightly appressed ; ray florets 

 narrow, about 12. Seed glabrous. — White, tinged with purple. 2f. 

 Sept. — Nov. Upper dist. Car. and Geo. 



38. A. oorymbo'sus, (Ait.) Stem erect, glabrous, with slightly pubes* 



