Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Roadsides, ditches, wastelots, cultivated fields, and other disturbed open areas.
Origin: Introduced from Europe
Growth Duration: Annual
Conservation Status: Not of concern
Pollination: Bees, flies, wasps
Usually glabrous annuals with trailing or climbing stems 3-10 dm. long.
Leaves on slender petioles, sagittate-ovate, 3-6 cm. long and half as broad; stipules obliquely funnel-form, not lacerate, brownish.
Flowers in axillary and terminal racemes, the individual racemes elongate, loose, interrupted, the flowers several per node; perianth green, five-parted, 3.5-4.5 mm. long, the outer three segments keeled, on short pedicles.
Achene with three sharp angles, black, smooth and shining, 3.5-4 mm. long.