Bot. Gaz. 56: 473. 1913.
Stems often forming dense mats, 5–30+ cm, often obscured by stipules and dense pubescence. Leaves: stipules 1–8 mm, often nearly as long as leaves, lobes acuminate; blade 2-grooved, 5–13 mm, apex finely spinose, glabrous. Flowers densely woolly, hairs 0.5–1.5 mm; sepals 5, margins fimbriate, awn 1.5–4 mm; staminodes white, 0.3–0.5 mm. Utricles: apex apiculate. Seeds 1.4–1.6 mm.
Phenology: Flowering spring–early summer.
Habitat: Sandy beaches, grassy bluffs, sand dunes
Elevation: 0-200 m
Calif., Oreg., Wash., Mexico, South America (Chile, Ecuador, Peru).
The flowers are burlike in fruit with the utricle enclosed in the rigid, persistent calyx, the presumed unit of seed dispersal.