Verbena urticifolia
From Nearctica
Identification: Flowers small, white, with a tubular corolla and 5 free petal lobes. Flowers arranged on a series of highly branched flower spike, one from the apex of the plant, and others arising from the leaf axils. Few flowers open at any one time. Leaves and stem hairy. Leaves in opposite pairs, elongate-ovate, with a pointed apex and a coarsely toothed outer margin. Plant 3 to 5 feet in height.
Distribution: Found throughout eastern North America.
Habitat: White Vervain is found along the edges of woods, in thickets, and old fields.
Flowering period: June to September.
Similar Species: White Vervain is easily separated from other Verbena species by its white flowers