This section is from the book "Harper's Guide To Wild Flowers", by Caroline A. Creevey. Also available from Amazon: Harper's Guide To Wild Flowers.
Family, Convolvulus. Color, white or with a pink tinge. Leaves, small, 1 to 2 inches long, arrow-shape at base, the basal lobes pointed, diverging, on slender petioles shorter than the peduncles. Corolla, funnel-form, its limb plaited, distinctly divided into 5 lobes. Flowers, usually in pairs, sometimes single, on slender peduncles on which are 2 or 3 small bracts, and perhaps 1 more on one of the pedicels. Blossoms. small, about 1 inch across. May to September.
A trailing or twining vine from a perennial rootstock, becoming a weed near the coast. Flowers open with sunlight and close at night. In waste grounds and dry fields, from New Jersey and Pennsylvania, westward and northward.
 
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