Distribution: Chiefly east of the Cascades in Washington; British Columbia south to California, east to Maine and Texas.
Habitat: Dry, sandy soil, from the plains to the lower mountains.
Conservation Status: Not of concern
Monoecious, glabrous annuals with prostrate, freely-branching stems 0.5-4 dm. long.
Leaves opposite, obliquely lanceolate to oblong, 5-15 mm. long, entire or with fine, rounded serrations; stipules mostly linear, 1 mm. long.
Flowers tiny, monoecious, borne in axillary involucres; staminate flowers numerous, naked, each consisting of a single stamen; pistillate flower single and terminal in the involucre; involucre bearing 4 pinkish glands with whitish appendages, a fifth gland represented by a short, fringed lobe.
Capsules smooth, 1.5 mm. long; seeds 1.2 mm. long, grayish, prismatic, coarsely wrinkled.