200 composite-:, (composite family.) 



very ; scales of the involucre leafy and spreading ; achenia smooth. — A Western 

 species, a form of which, with narrower and less silvery leaves and scales, grows 

 on the mountains of North Carolina. — Stem 10'-20' high. Leaves V — f 

 long. Heads showy. 



11. A. concolor, L. Stem mostly simple, slender, bearing towards the 

 summit, the middle-sized heads in a long often compound raceme ; leaves lance- 

 olate, silky when young; the lowest ones oblong ; scales of the obovoid involu- 

 cre lanceolate, appressed, the subulate tips spreading; achenia silky. — Dry 

 sandy soil, Florida and northward. — Root sometimes tuberous. Stem l°-3° 

 high. Leaves erect J' — 1' long. 



* * Leaves rough, all sessile or clasping and entire: heads chiefly solitary, terminat- 

 ing the branchlets : scales of the obovoid or bell-shaped involucre imbricaU <l in s< u ral 

 rows, coriaceous, with herbaceous slightly spreading tips: rays purplish-blue: achenia 

 hairy. 



+- Leaves ivry small, sessile : heads small: scales of the. involucre spatulate. 



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

 angular-ovate, reflexcd, very rough, sessile; the lowest spatulate. — Dry soil, 

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

 others 2" - 3" long. 



13. A. adnatllS, Nutt Stem with the slender branches erect; leaves ob- 

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

 lowest wedge-obovate, free. — Sandy barrens, Florida and Alabama. — Stem 

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



-i- h- Leaves all clasping and auricled at the base : heads large : scales of the invo- 

 lucre linear. 



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

 ovate-oblong, with very rough and wavy margins ; those on the slender and 

 spreading branchlets very small. — Var. PHLOOIFOLIUS. 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, tin- others 



sessile or clasping: hinds middle-sized, showy: scabs of the obovoid involucrt 

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



smooth. 



15. A. la3Vis, L. Very smooth and often glaucous; stem rigid, paniclcd 



above, bearing the showy heads on shorl rigid branchlets; leaves oblong or lan- 

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

 ii e or clasping ; scales of (he involucre rigid, appressed, with abruptly point) <] 

 herbaceous tips. — Open woods in the upper districts. — Stem 2°-8°high. 



16. A. gracilcntus, Torr. & Gray, Very an th; Btem slender, loosely 



panicled above, bearing the heads al the end of slender leafy branchlets : leaves 

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



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



