200 COMPOSITA. (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 i^ sy? 
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 boroi involu- 
cre lanceolate, appressed, the subulate tips spreading; achenia silky. — Dry 
sandy soil, Florida and northward. — Root sometimes tuberous. Stem 19-3? 
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 imbricated in several ; 
rows, coriaceous, with herbaceous slightly spreading tips: rays purplish-blue: achenia 
hairy. po 
+ 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 spatulate. — Dry soil, 
Florida to North Carolina. — Stem 1°-2° high. Lowest leaves }/ long, the 
others 2” — 3" long. ; 
13. A. adnatus, 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 — — 
19-2? high. Heads smaller than in the preceding. 
= + Tanen es ee un ia heads large : scales of the into — id 
lucre linear. 
14. A patens, Ait. Stem pubescent, loosely panicled above; leaves - 
ovate-oblong, with very rough and wavy margins; those on the slender and 
spreading branchlets very small. — Var. PHLOGIFOLIUS. Leaves larger, thinner, — 
and less roughened, contracted below the middle; heads often racemose on 
short lateral branches. — Dry soil, chiefly in the upper districts. — Stem jo, dt 
high. Leaves 1/—2/ (in the var. 3-6) long. Heads showy. 
* * * Leaves (and stems) smooth: the lowest tapering into a petiole, the others — E 
` sessile or clasping: heads middle-sized, showy: scales of-the obovoid involucre E 
whitish, the short green tips scarcely spreading : rays v blue: achenia 
smooth. 
15. A. leevis, L. Very smooth and often glaucous; stem rigid, panicled 2 
above, bearing the showy heads on short rigid branchlets ; 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 abruptly pointed : 
herbaeon M Open woods ix the ipiiMien, — Stem 20-39 high. — 
16. A. gracilentus, Torr. & Gray. Very smooth; stem slender, loosely 
i ove, f the heads at the end ee ee 
