Madroño 13: 25. 1955.
Stems erect, branched, slender, usually (0.5–) 1–1.5 m. Leaves: petiole 1/4 length of blade; blade linear to narrowly oblong, usually 10 (–20) × 1 cm, base narrowly cuneate, margins entire, plane, apex obtuse to rounded. Inflorescences terminal, linear spikes to panicles. Bracts: of pistillate flowers 1–1.5 mm; of staminate flowers with moderately heavy midrib, 1–1.5 mm. Pistillate flowers: tepals 1–2 (–3), unequal, inner tepals lanceolate to narrowly lanceolate, 1–1.5 mm, apex acute to acuminate; style-branches spreading; stigmas 3. Staminate flowers: tepals 5, with excurrent midrib, equal to subequal, 2 (–2.5) mm, apex acute to indistinctly mucronulate in outer tepals; stamens 5. Utricles reddish to reddish-brown, occasionally with indistinct longitudinal ridges, subglobose to broadly obovoid, 1.5–2.5 mm, wall thin or slightly fleshy, irregularly rugose. Seeds dark reddish-brown to dark-brown, 0.7–1 mm diam., shiny.
Phenology: Flowering late spring–fall.
Habitat: Coastal dunes, beaches, swamps, marshes, disturbed habitats, such as gardens and fields near coast
Elevation: 0-10 m