462 



SYNGENESIA NECESSARIA 



2. PiNNATIFIDUM. 



E. 



S. caule glabriuscu 



lo; foliis smuato-pinna- 



tifidis, subscabris, sub- I pinnatifid. 



Stem somewhat gla- 

 brous: leaves sinuate, 



somewhat 



invo 



tus parce pilosi 



lucn squamis ovalibus 



exterioribus rotunda 



tis. 



I 



scabrous, a little hairy 

 underneath; scales of 



the 

 the 



round. 



involucrum oval, 

 exterior nearly 



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 sui-face nearly glabrous, the under surface slightly scabrous, 

 sprinkled with a few short hispid hairs. Flo7Ders large, not numerous, 

 scattered in a loosely branching panicle. Scales of the mvolucrum imbri- 

 cate, glabrous, the exterior circular, the interior oval, obtuse. Florets ol 

 the ray about as long as the involucrum. Seeds winged, obovate, emargi- 



nate. , 



Grows in the western districts of Georgia, and particularly in and arouna 



the prairies of the Alabama. 

 Flowers July to August. 



3. CoMPosiTUM. Mich. 



S. caule laevi: foliis 



I Stem smooth; leaves 



caulinis sinuato-pinna- 1 of the stem sinuate, 

 tifidis, radicalibus ter- pinnatifid, of the root 

 natib, sinuato-multifi- ternate, sinuate, many 



dis; floribus parvis, pa- cleft; 



flowers 



s m all 



9 



niculatis. 



paniculate 



Sp. pi. 3. p. 2331. Mich. 2. p. 145. Pursh, 2. p. 577- Nutt. 2. P 



182. 



Walt 



Root perennial. Stem two to four feet high, simple, ^J^^^^y .^Y^'^^nt 



Leaves 



ate and lobed, sometimes pinnatifid, glabrous on the upper surface, spru ^^ ^ 

 with hairs on the under surface and along the margin. Fhtcers sma j^^^^^ 

 terminal, somewhat corymbiform panicle. Scales of the involucrum 



