Distribution: West of the Cascades, southwest Washington south to central California.
Habitat: Wet or muddy ground at low elevations, including venral pools.
Conservation Status: Critically Imperiled in Washington (WANHP)
Glabrous, lax annuals, the stems rooting from the lower nodes, 0.5-3 dm. tall.
Leaves opposite, linear, entire, blunt, 2-8 cm. long, at least some of the pairs attached to each other at the base.
Heads few, often long-pedunculate; involucre of 5-15 bracts united in a toothed cup, 5-7 mm. high, the teeth with marginal hairs; rays pistillate and fertile, yellow, short and inconspicuous, not exerted from the involucre; disk flowers perfect and fertile, yellow; pappus of 5-10 firm, awn-tipped scales.