200 COMI'OSIT^K. (cOMrOSlTK FAMILY.) 



very; scales of tlic iiivolncrt' leafy ami i^preadin}; ; aclienia stnoolli. — A Western 

 species, n form of which, with narrower and less silvery leaves anil scales, prows 

 on the mountains of North Carolina. — Stem 10' -20' high. Leaves ^'-1' 

 Ion;.'. Heads showy. 



11. A. COnCOlor, L. Stem mostly simple, slender, hearing towards the 

 summit, the middle-siz;d heads in a long often comjionnd raceme ; leaves lance- 

 olate, s^ilky when young; the lowest ones ohlong; scales of the ohovoid involu- 

 cre lanceolate, aj)])ressed, the subulate tips spreading; nehenia silky. — Dry 

 sandy soil, Florida and nortiiward. — Hoot sometimes tuberous. .Stem l°-3° 

 high. Leaves erect 2'- 1' long. 



* * Leaves roufjh, all sessile or claspimj and entire: heads chiejljj solitary, terminat- 

 ing the hranchlets : scales of the ohovoid or bell-shaped involucre inihricnled in several 

 roics, coriaceous, icith herbaceous si ightlji spreading tips: rai/s purplish-blue : achenia 

 hairy. 



•1- Leaves very small, sessile: heads small: scales of the involucre spatulate. 



12. A. squarroSUS, Walt. Stem slender, diffuse ; leaves oblong or tri- 

 angular-ovate, reflexed, very rough, sessile ; the lowest S])atulate. — Dry soil, 

 Florida to North Carolina. — Stem I°-2° high. Lowest leaves i' long, the 

 others 2" - 3" long. 



13. A. adnatus, Xutt. Stem with the slender branches erect; leaves ob- 

 long, very rough, the midrib partly adnate to the stem, free at the apex; the 

 lowest wcdge-obovatc, free. — Sandy barrens, Florida and Alabama. — Stem 

 l°-2° high. Heads smaller than in the preceding. 



H- -f- Leaves all clasping and auricled at the base : heads large : scales of the invo- 

 lucre linear. 



14. A. patens, Ait. Stem pubescent, loosely panicled above ; leaves 

 ovate-ol)long, with very rough and wavy margins ; those on the slender and 

 spreading branchlcts very small. — Var. phlogifolius. Leaves larger, thinner, 

 and less roughened, contracted below the middle; heads often racemose on the 

 short lateral branches. — Dry soil, chiefly in the upper districts. — Stem l°-3° 

 high. Leaves l'-2' (in the var. 3' -6') long. Heads showy. 



* * * Leaves (and stems) smooth : the lowest tapering into a petiole, the others 



sessile or clasping: heads middle-sized, showy: scales of the obovoul involucre 

 tvhitish, the short green tips scarcely spreading : rays bright blue : achenia mostly 

 smooth. 



15. A. laevis, L. Very smooth and often glaucous; stem rigid, panicled 

 above, bearing the showy heads on short rigid branchlcts ; leaves oblong or lan- 

 ceolate, coriaceous, mostly entire and rough on the margins ; the upper ones 

 sessile or clasping ; scales of the involucre rigid, appressed, with abr\tptly pointed 

 herbaceous tips. — Open woods in the upper districts. — Stem 2° - 3° high. 



16. A. gracilentUS, Torr. & Gray. Very smooth; stem slender, loosely 

 panicled above, bearing the heads at the end of slender leafy branchlcts ; leaves 

 linear, elongated ; the lower ones coarsely toothed above the middle, the upper 

 slightly clasping and entire ; scales of the involucre much shorter than the disk, 



