COMPOSITH. (COMPOSITE FAMILY.) 203 
the others sessile or partly clasping ; the uppermost very small, erect ; scales of 
the involucre in 3 — 4 rows, linear, acute. — Dry pine barrens, Florida and Geor- 
gia.— Stem 19-29 high. Lowest leaves 1/ long, the upper ones 2" — 3" long, 
similar to those of No. 13. 
29. A. dumosus, L. Smoothish; stem slender, racemose-panicled, bear- 
ing the small heads chiefly on slender and very leafy branchlets ; leaves linear, 
entire, spreading or reflexed ; the lowest spatulate-lanceolate, serrate ; those of 
the branches short, linear-oblong, and mostly obtuse: scales of the involucre 
closely imbricated in 3 — 6 rows, with obtuse green tips. (A. foliolosus, Ell.) — 
Dry or damp soil, common, and running into several varieties, — Stem 29 — 3° 
high. Rays pale purple or white. 
30. A. Tradescanti, L. Stem slender, pubescent, tacemose-branched ; 
leaves long, linear-lanceolate, sparingly serrate, tapering into a long and slender 
point; the uppermost entire ; heads in close racemes along the spreading branch- 
es; scales of the involucre narrow-linear, acute, imbricated in 3-4 rows. — Var. 
FRAGILIS. Leaves mostly entire ; heads fewer, often solitary on the branchlets. 
(A. tenuifolius, Ell.) — Low ground in the upper districts. — Stem 2°- 39 high. 
Rays pale purple or white. 
3l. A, miser, L. Pubescent or hairy ; stem simple, and bearing the small 
heads in a long and leafy compound raceme, or diffusely branched, with the 
heads scattered along the branches, or in short few-flowered racemes ; leaves 
varying from linear-lanceolate to wedge-obovate, acute at each end, sharply ser- 
rate in the middle; the lowest spatulate, the uppermost entire; scales of the 
involucre linear, acute. — Low grounds and banks, common and very variable. 
— Stem 19 - 4° long. Rays white or purplish. A. diffusus, A. divergens, and 
A. pendulus, of Aiton, are forms of this. 
+ + Heads middle-sized. 
32. A. simplex, Willd. Stem smooth or pubescent in lines, corymbose 
or racemose-branched ; heads in short racemes ; leaves lanceolate, acute or acu- 
minate at both ends, smooth, rough on the margins, the lower ones sharply ser- 
rate ; scales of the involucre linear-subulate, loosely imbricated. — Low ground, 
Florida, and northward. —Stem 3°-6° high, sparingly or diffusely branched. 
Leaves 9! — 4! long. Rays pale blue. T 
33. A. tenuifolius, L. Nearly smooth; stem paniculately branched; — 
the rather small heads disposed in panicled racemes ; leaves long, narrow-lance- 
» tapering to a long and slender point ; the lower ones commonly serrate in - 
the middle; scales of the involuere numerous, linear-subulate, appressed. — 
Low ground in the upper districts, Georgia, and northward. — Stem 2°- 3° 
high. Leaves 3! — 6/ long. Rays short, pale purple or white. ! 
E: eee a0 * Leaves lanceolate or oblong, sessile, the upper, ones more or less clasp- 
‘tg: heads large or middle-sized : scales of the involucre nearly equal, with spread: — 
9 green tips: rays mostly large and numerous, blue or purple. 1 
ue ia A. Novi-Belgii, L. Nearly smooth ; stem stout; leaves oblong: 
qt uL ate, pale or somewhat glaucous, serrate in the middle, acute or 
