- ¢47 °°" or — i Pets | 



POLYGAMIA, FRUSTRANEA. 133 
Coreopsis alternifolia, L. and others. 
erbesina Coreopsis, Mich. and Pursh. 
From three to seven feet high. Flowers not handsome, 
atl On the marshy shores of all our waters, abundant. 
. ial. July, September. 
oe 
¥ 
, 
_ ORDER IVY. POLYGAMIA NECESSARIA, 

(Radial florets only, fertile.) 
330. AMBROSIA. Gen. pl. 1427. (Corymbifere.) 
Monoicous.—Masc. Calix 1-leaved. An- 
thers approximate, but not united. Recep- 
- tacle naked.—Fem. Calix 1-leaved, entire 
or 5-toothed, 1-flowered. Corolla none. 
-Vut formed from the indurated calix, 4- 
L 
seeded.— Vutt. "7 
’ 
1. A. hirsute, asperate; leaves 3-lobed, serrated ; trifica. Y 
lohes oval-lanceolate, acuminate ; fruit 6-spined ‘4 
below the top.— Willd. and Pursh. 
Icon. Morris. Hist. 3. s. 6. t. 1. f. 4. 
Trifid-leaved Hogweed. 
From four to eight feet high. Flowers very ordinary and 
small. On the banks of rivers, creeks and ditches, every where 
very common. Annual. August, September. 
a my ee, 
2. A. leaves bi-pinnatifid, hairy beneath, upper artemisifolia. 
ones pinnatifid; racemes ternate, terminal ; 
branches fastigiate.— Willd. 
Wormwood-leaved Hogweed. 
From two to four feet high. A very common weed in all 
cultivated grounds and neglected fields. Annual. August, 
September. 

