Distribution: Widely introduced in eastern United States; occasional in Washington.
Habitat: Weed of waste places, field edges and marshes.
Flowers: July - September
Conservation Status: Not of concern
Herbaceous annuals, erect to decumbent, rooting at the lower nodes, the stems diffusely branched.
Leaves alternate, narrowly lanceolate to ovate-elliptic, 5-12 cm. long and 1-4 cm. wide, entire, pointed.
Inflorescence of 1-2 terminal cymes enclosed in a large bract; bract green, whitish basally, with contrasting dark green veins, 1.5-3 cm. long and 0.8-1.3 cm. wide, the margins scabrous, on a peduncle 0.8-3.5 cm. long; flowers usually perfect, the lower petal white, much smaller than the upper 2, which are blue to purplish-blue; stamen 6, the lower three fertile, the upper 3 sterile.
Capsules 2-celled, 4.5-8 mm. long.