Distribution: Widely distributed throughout most of Washington; widely distributed throughout North America.
Habitat: Swales, wet meadows, stream banks, and other moist places, from the lowlands to moderate elevations in the mountains.
Origin: Both native (var. xalapensis) and introduced (var. peregrina) varieties
Conservation Status: Not of concern
Fibrous-rooted annual, the stems erect, 0.5-3 dm. tall, simple or branched below.
Principal leaves opposite, linear-oblong to oblanceolate, 0.5-3 cm. long and 1-9 mm. wide, irregularly toothed or entire.
Inflorescence terminal, elongate, lax; bracts alternate, similar to the leaves, gradually reduced upward, each subtending a single, sub-sessile flower; sepals 4; corolla white, inconspicuous, 2 mm. wide; style very short; stamens 2.
Capsule 3-4 mm. high, obcordate.