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: May to September.
Seed-time: June to October.
Range: New Brunswick to Ontario and Minnesota, southward to the Gulf of Mexico. Habitat: Gardens, lawns, fields, roadsides, and waste places.
Like Purslane and Common Chickweed, this plant seems almost domesticated in its liking for cultivated fields and gardens. It is frequent along sandy roadsides, and springs up in the crevices of city pavements and sidewalks.
Stems three inches to a foot long, smooth, prostrate, branching in all directions from the slender root and forming circular mats. Leaves in whorls of five or six, spatulate, sessile, entire, a half-inch to an inch long. Flowers, axillary, very small and without petals but having a five-parted calyx, white inside and green without, three stigmas, and five stamens if they alternate with the sepals or three stamens if they alternate with the three cells of the ovary. Seed capsules ovoid, three-celled, and as soon as ripe the partitions break away from the central axes, spilling the many fine, brown, kidney-shaped seeds into the soil. (Fig. 87.)
Fig. 87. - Carpetweed (Mollugo verticillata). X 1/2.
Prevent seed development by frequent hoe-cutting. After the harvesting of corn, potatoes, or other hoed crops, harrow the ground so as to destroy the later growth of weed seedlings.