462 
SYNGENESIA NECESSARIA. 
2. PlNNATIFIDUM. E. 
Stem somewhat gla- 
brous; leaves sinuate, 
pinnatifid, somewhat 
scabrous, a little hairy 
underneath; scales of 
the involucrum oval, 
the exterior nearly 
round. 
Stem four to six feet high, smooth and glabrous even among the branches. 
Leaves large, sinuate, pinnatifid, the summits of the segments generally 
acute, the upper surface nearly glabrous, the under surface slightly scabrous, 
sprinkled with a few short hispid hairs. Floioers large, not numerous, 
scattered in a loosely branching panicle. Scales of the involucrum imbri- 
cate, glabrous, the exterior circular, the interior oval, obtuse. Florets of 
the ray about as long as the involucrum. Seeds winged, obovate, emargi- 
nate. 
Grows in the western districts of Georgia, and particularly in and around 
the prairies of the Alabama. 
Flowers July to August. 
S. came glabriuscu- 
lo; foliis sinuato-pinna- 
tifidis, subscabris, sub- 
tus parce pilosis; invo- 
lucri squamis ovalibus, 
exterioribus rotunda- 
tis. E. 
3. Compositum. Mich. 
Stem smooth; leaves 
of the stem sinuate, 
pinnatifid, of the root 
ternate, sinuate, many 
cleft; flowers small, 
paniculate. 
Sp. pi. 3. p. 2331. Mich. 2. p. 145. Pursh, 2. p. 577 • Nutt. 2. p. 
182. 
S. Laciniatum, Walt. p. 217* 
Root perennial. Stem two to four feet high, simple, nearly glabrous. 
Leaves much smaller than those of the preceding species, irregularly sinu- 
ate and lobed, sometimes pinnatifid, glabrous on the upper surface, sprinkled 
with hairs on the under surface and along the margin. Flowers small, in a 
terminal, somewhat corymbiform panicle. Scales of the involucrum ovate, 
S. caule laevi; foliis 
caulinis sinuato-pinna- 
tifidis, radicalibus ter- 
natis, sinuato-multifi- 
dis; floribus parvis, pa- 
niculatis. 
