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: Indiana to Minnesota and Nebraska, southward to the
Gulf of Mexico. Habitat: Fields and meadows, banks of streams, waste places.
A small, very slender, low-climbing plant, with stems fifteen to thirty inches long, clothed with fine, downward-turning hairs. Leaflets lance-shaped or oblong to linear, without lobes, obtuse at apex and rounded at base, entire, little more than an inch long and less than a half-inch wide. Heads two- to six-flowered, in capitate clusters, on peduncles much longer than the leaves; corollas pale purple and only about a quarter-inch long. Pods very slender, a little more than an inch in length, flat, and very hairy. Beans purple, very small and flat, at first mealy but later smooth and shining.
Means of control the same as for the Trailing Wild Bean.