Distribution: Widely distributed on both sides of the Cascades crest in Washington; widely distributed throughout much of North America except in the southern U.S.
Habitat: Mostly in mud, often where brackish, from sea level to mid-elevations in the mountains.
Conservation Status: Not of concern
Low perennial from slender roots, the stem nearly prostrate, simple or sparingly branched, rooting at the nodes, up to 5 dm. long.
Leaves simple, entire, the blades from broadly oblanceolate to narrowly linear, the basal ones long-petiolate, the cauline leaves nearly sessile.
Flowers usually solitary on pedicels up to 10 cm. long; sepals 5, 2-5 mm. long, with appressed hairs; petals usually 5, yellow, 4-5 mm. long; nectary scale broader than long, forming a shallow pocket; receptacle ovoid, glabrous; stamens many; pistils 5-25.
Achenes in globose to hemispheric heads 2-4 × 3-4 mm; achenes glabrous 1.2-1.6 × 1-1.4 mm with straight or curved beaks 0.1-0.6 mm in length.