98 
Native. 
POLYGONACEAE (BUCKWHEAT FAMILY) 
Annual. 
ERECT KNOTWEED 
Polggonum eréctum, L. 
Propagates by seeds. 
Time of bloom: July to September. 
Seed-time: August to October. 
Range: Ontario to the Northwest Territory, southward to Ten- 
nessee and Arkansas. 
Habitat: Yards, waysides, and waste places. 
A plant resembling the Doorweed and often growing in company 
with it, but having larger leaves and flowers and standing erect at 
Fic. 58.— Erect 
Knotweed (Polygonum 
erectum). X 4. 
Native. 
a height of four inches to afoot or more. Stem 
slim, round, smooth, yellowish green, with 
many branches. Leaves broader than those 
of the Doorweed, one-half inch to an inch 
long, elliptical, usually obtuse, sessile or with 
very short petioles; stipules funnel-shaped, 
paper-white, often torn and ragged. Flowers 
greenish white, in small axillary clusters, on 
pedicels usually about as long as the sheathing 
stipules; stamens five or six. Achenes dull 
brown, pointed ovoid, enclosed in the per- 
sistent calyx-lobes. (Fig. 58.) 
Means of control 
Prevention of seeding by close cutting or 
pulling while in early bloom. 
BUSHY KNOTWEED 
Poljgonum ramostssimum, Michx. 
Annual. 
Propagates by seeds. 
Time of bloom: July to September. 
Seed-time: August to October. 
Range: Maine to New Jersey on the Atlantic Coast; in the West 
from Minnesota to the Northwest Territory, California, Arizona, 
and New Mexico. 
Habitat: Sandy, often brackish, soil; irrigated lands, waste places. 
