This section is from the book "A Manual Of Weeds", by Ada E. Georgia. Also available from Amazon: A Manual Of Weeds.
Native. Annual. Propagates by seeds. Time of bloom: July to September. Seed-time: August to October.
Range: Ontario to the Northwest Territory, southward to Tennessee 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 a height of four inches to a foot 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 persistent calyx-lobes. (Fig. 58.)
Prevention of seeding by close cutting or pulling while in early bloom.