I POLYGAMIA, SUPERFLU A. 125 
319. SENECIO. Gen.pl. 1291. (^Corymbiferce.) 
Receptacle naked. Pappus simple. Calix 
cylindrical, calyculate; scales sphacelate 
at the apex. 
I| 1. S. leaves amplexicaule, pinnatifid, dentate ; flow- vuig.n-is. 
1 ers corymbose, coarctate. — Willd. and Pursh. 
i! 
I Common Groundsel. 
I An introduced weed, from Europe. Near gardens, and the 
I fields of our vicinity, not unfrequent. Annual. From April 
till late in autumn. 
2. S, stem virgate, paiiiculated ; leaves amplexi- hieracifoims, 
caule, oblong, acute, unequally and deeply den- 
tated ; calices smooth.— 'Willd. and Pursh. 
Icon. Pluk. phyt. t. 112. f. 1. 
Fire-weed. Hawk-weed. Groundsel. 
From a foot to three feet high. Flowers white. This is 
one of the commonest weeds in our country, growing almost 
every where, even on the roofs, and in the spouts of the 
roofs of old houses. Annual. July, August. 
3. S. radical leaves obovate, crenate-serrate, pe- obovatus, 
tiolated; stem-leaves pinnatifid, dentated| flowers 
somewhat umbelled, on long peduncles^ stem 
smoothish. — Willd. and Pursh. 
S. obtusatus. Herb. Banks, Mss. (Pursh.) 
Ohovate-leaved Groundsel 
About twelve or fifteen inches high. Resembles No. 4, 
from which it may, however, be easily distinguished by its 
obovate, radical leaves, its smaller and less brilliant flowers, 
being besides a smaller plant. In shady woods, on rocks ; 
rare. Perennial. June. 
4. S. radical leaves ovate-cordate, serrated, petio- aumis. 
lated ; those of the stem pinnatifid^ dentated, the 
VOL. II. 12 
