248 POPULAR FIELD BOTANY. 
SYNGENESIA. AUQUALIS. 
CoOROLLIFLORZ, ASTERACES. 
BIDENS. (Bur-maricoxp.) 
Generic Character. Calyx or mvolucre of many scales, outer 
ones foliaceous at the base. Corolla tubular, erect and parallel. 
Brpens cernua. Nodding Bur-Marigold. Frequently 
found on the sides of ditches and rivulets. From one to 
two feet high, and even more, branched and slightly hairy. 
Leaves smooth, deeply cut at the edges, but not divided. 
Flowers large, greenish-yellow, and drooping. Seeds flat 
and oblong, with two or three bristles at the top. 
Another species, B. tripartita, flowers later, and is dis- 
tinguished by the leaves being divided into three or five 
parts ; it 1s found in marshy places. 
SYNGENESIA. SUPERFLUA. 
COROLLIFLORZ. ASTERACEA. 
CHRYSANTHEMUM. (Ox-nys.) 
Generic Character. Involucre hemispherical, formed by scales, 
the edges of which are membranous. No feathers to the seed. 
