202 COMPOSITAE. (COMPOSITE FAMILY.) 
+ + Lowest leaves conspicuously serrate : heads small. "a 
23. A. cordifolius, L. Stem commonly smooth, racemose-panicled above; 
leaves smooth, or rough above and pubescent beneath, all cordate, serrate, and - 
slender-petioled, or the uppermost on short winged petioles, or sessile and entire; 
heads very numerous in panicled racemes ; scales of the obconical involucre loose- 
ly imbricated, with obtuse or slightly pointed green tips. — Open woods, in the 
upper districts. — Stem 19 —3? high. Leaves commonly thin. Rays pale violet. . 
24. A. sagittifolius, Willd. Stem nearly smooth, racemose-branched . 
above; leaves ovate-lanceolate, acuminate, pubescent; the lowest cordate, on- 
long and mostly margined petioles ; the upper abruptly contracted into a winged - 
petiole; those of the branches lanceolate, acute at both ends, entire; heads in- 
dense compound racemes ; scales of the oblong involucre rather loosely imbri- - 
cated, linear-subulate, the tips green and spreading. (A. paniculatus, Ell.) — 
Rich woods, Florida and northward.— Stem 29 -39 high. Heads more crowded | 
than those of the preceding. Rays purple. s 
* * * * Leaves linear or lanceolate, entire, sessile ; radical ones spate lance 4 
late, serrate: heads small and numerous, racemed : scales of the involucre in several 
rows, rigid, with spreading or recurved green tips. k 
25. A. ericoides, L. Smooth; stem much branched ; leaves linear-lance- 
olate, acute at each end; those of the branches subulate; heads racemose, mostly 
on one side of the spreading branches ; scales of the involucre broadest at the base,” 
with acute or subulate tips. — Var. viLLOsUs. Stem and broader leaves rough- - 
hairy, and the smaller heads in shorter and more dense racemes. — Var. PLATY- 
PHYLLUS. Stem (3? - 49) and larger leaves clothed with soft white hairs ; heads ` 
larger. — Dry soil, Florida, and northward. — Stem 19-29 high. Rays white 
or pale blue. : 
26. A. multiflorus, Ait. biberi; stem very leafy, and much 
branched ; leaves linear, obtuse at each end, often bristle-pointed, spreading 0 .- 
recurved, vue upper ones sessile or somewhat clasping; heads densely racemose 
on the short and very leafy branches, or sometimes solitary at their summits į a 
scales of the involucre broadest at the apex, obtuse or short-pointed. —Dy xi 
sterile soil, in the upper districts. — Stem 19 — 99 high. Leaves about i! ei 4 
Rays white. s 
* * * * * Leaves linear, lanceolate, or oblong, sessile, usually narrede 
base: heads small or middle-sized : scales of the involucre membranaceous, with ap- 
pressed or slightly spreading tips: rays pale purple or white. € 
+ Heads small. 
27. A. racemosus, Ell. Rough-pubescent; stem sich branched, beat 
ing the small heads in a spiked raceme near the summit of the slender €T 
branches ; leaves linear, sessile, rigid; scales of involucre smooth, li 
late; the inner ones as long as the disk ; rays very short. — Damp rich 
Paris Island, South Carolina. — Stem 2° high. Rays pale purple. - 
> fa & Gray. ae stem slender, pas 
