364 ORDER Lxvni. — composite. 



11. A. ericoi'des, (Willd.) Stem erect, slender, with numerous ex- 

 panding branches. Leaves of the stem linear, glabrous, acute at each 

 end, those of the branches subulate, numerous, very small. Flowers in 

 racemes, on short peduncles; involucre with lanceolate scales; ray flo- 

 rets numerous, linear. — Purple. If. Oct. — Nov. Barren soils. Com- 

 mon. 2 — 3 feet. 



12. A. racemo'sus, (Ell.) Stem diffuse, with slender, slightly pubes- 

 cent branches. Leaves linear-lanceolate, with the margins scabrous, 

 pubescent beneath, those of the branches very small. Flowers in sim- 

 ple racemes at the summit of the branches ; involucre with linear- 

 lanceolate scales ; ray florets numerous, linear. — Purple. 2f. Sept. — 

 Oct, On the coast. 1—2 feet. 



13. A. multiflo'rus, (L.) Stem diffusely branched, almost hispid. 

 Leaves linear, acute, pubescent, and fringed along the margiu. Flow- 

 ers in terminal racemes, somewhat secund ; involucre with ciliate, obo- 

 vate scales, squarrose. — Almost white. 2£. Aug. — Sept. In open 

 fields. Common. 2 — 3 feet. 



14. A. adna'tus, (Nutt.) Stems minutely hispid, branches virgate. 

 Leaves small, appressed, joined to the stem, except the tips. — Pale pur- 

 ple. Mid. Car. and Geo. Oct. — Nov. 18 — 24 inches. 



15. A. squarro'sus, (Walt.) Stem procumbent, branching, hispid, 

 hairy. Leaves small, numerous, ovate, reflexed, hispid along the mar- 

 gin, scabrous. Flowers terminal, in a loose panicle ; involucre with 

 lanceolate hairy scales ; ray florets numerous, 3-toothed, rather large. 

 — Blue. 2f. Sept. — Oct. Dry soils. Common. 2—3 feet. 



1G. A. conco'lor, (L.) Stem erect, pubescent, sparingly branched 

 toward the summit. Leaves pubescent, almost tomentose, oblong-lance- 

 olate. Flowers in terminal racemes ; involucre with lanceolate, silky 

 scales; ray florets linear-lanceolate. — Blue. If. Sept. — Oct. Dry 

 soils. Common. 2 — 3 feet. 



17. A. reticula'tus, (Pursh.) Stein erect, tomentose, branching to- 

 ward the summit. Leaves sessile, oblong-lanceolate, acute, margins 

 revolute, tomentose, 3-nerved. Floioers in racemes; involucre with 

 acute scales. — White. If. Aug. — Oct. Car. and Geo. 2 — 3 feet. 



18. A. Nov^e An'glle, (L.) Stem erect, with diffuse, spreading 

 branches, hairy. Leaves narrow, lanceolate, amplexieaul, auriculate 

 at the base, hairy, and scabrous along the margin. Flowers in termi- 

 nal panicles; involucre with lanceolate scales, somewhat hispid; ray 

 florets numerous, narrow. — Purple. If. Sept. — Oct. Western Geo. 

 4—10 feet. 



19. A. Cya'neus, (Ell.) Stem glabrous, young branches slightly 

 pubescent, expanding. Leaves linear-lanceolate, somewhat scabrous, 

 slightly amplexieaul. Flowers in paniculate racemes ; involucre with 

 appressed linear-lanceolate scales ; ray florets numerous, narrow. Seed 

 pubescent.— Purple. 2f. Sept. — Oct. Middle Car. and Geo. 3 — 4 

 feet. A. concinus, Willd. 



20. A. virga'tus, (Ell.) Stem erect, glabrous, with long erect virgate 

 branches, slightly pubescent at the summit. Leaves linear-lanceolate, 

 amplexieaul, long, glabrous, margins slightly scabrous. Flowers in 

 terminal racemes; involucre with the scale slightly squarrose, slightly 

 mucronate ; rav florets small. Seeds scarcely pubescent. — Purple. Z(. 

 Sept.— Oct. Middle Geo. 3 — 4 feet. 



