234 COMPOSITZ. (COMPOSITE FAMILY.) 
lobed, or all linear and entire; exterior scales of the involucre linear-spatulate ; 
achenia smoothish, with two short triangular teeth. (C. mitis, Michx. C. arguta, 
Pursh.) — Swamps, Florida to North Carolina, and westward. Aug.- Oct.— 
Stem 29 -4? high. Leaves polymorphous; the uppermost commonly undivided. 
Rays showy. l 
a 
3. C. trichosperma, Michx. Smooth; stem somewhat 4-angled, branch- 4 
ing; leaves pinnately 5-7-parted; the divisions lanceolate or linear, sharply 
serrate or toothed ; the upper ones 3 - 5-cleft; exterior scales of the involucre 
linear, obtuse; achenia hispid above, crowned with two triangular hispid teeth. - 
— Swamps, South Carolina, and northward. Sept. — Stem 19-29 high. Ache - 
nia twice as large as in the preceding. 
+ + Leaves petioled : achenia elliptical or obovate, emarginate, awnless : exterior = 
scales of the involucre shorter than the interior. 
4. C. tripteris, L. Stem smooth, branching ; leaves smooth, or rough — 
above; the upper and lower ones entire, the middle ones 3- (rarely 5-) parted, . 
with the divisions lanceolate and entire; exterior scales of the involucre 5-6, 
obtuse, united at the base; achenia elliptical, smooth, incurved, narrowly winged. 
— Woods and margins of fields, Florida to North Carolina, and westward. - 
Aug. and Sept. — Stem 3° - 6° high. 
5. C. latifolia, Michx. Smooth or somewhat pubescent ; stem tall; leaves 
undivided, ovate-oblong, acuminate, coarsely serrate, smooth above, paler be- 
neath ; heads small, corymbose ; scales of the involucre 4-5 in each row; the 
exterior ones short, not united below; rays 4-5; achenia obovate-oblong, 
wingless. — High mountains of Georgia and North Carolina. Aug. — Lowest 
leaves 6! long. 
+ + + Leaves sessile, 3-parted to the base, seemingly 6 in a whorl ; the divisions 
entire or variously divided: scales of the involucre equal; the exterior ones linear- — 
oblong, united below: achenia oblong, narrowly winged, naked or minutely 2 
at the apex. 
6. C. senifolia, Michx. Pubescent; stem 4-angled below, branching; des 
visions of the leaves oval-lanceolate, entire, the uppermost leaves often simple; 
disk yellow; achenia minutely 2-toothed. (C. stellata, Nutt., with the stem mor? - 
slender and leaves narrower.) — Dry sandy woods, Florida to North Carolina, | 
7. C. delphinifolia, Lam. Smooth or slightly pubescent; divisions of 
the leaves entire or 2 — 3- (the middle one sometimes 5-) parted, linear-lanceolat®, — 
and westward. Aug.— Stem 2° high. Leaves 1-2 long. Rays 67-9 - 
rather rigid ; disk brownish; achenia obovate-oblong, minutely 2-toothed. (Co 
verticillata, Ehrk., Ell.) — Dry soil in the upper districts. Ang. and Sept — — 
tenuifolia, EU.) — Low ground, in the 
or filiform ; disk yellow; ache 
