Man. Bot. San Francisco, 188. 1894.
Perennials, 50–150 (–350+) cm. Stems prostrate or decumbent. Leaves mostly alternate; petioles 15–30 (–45+) mm; blades rounded-deltate to ovate or obovate, 20–45 (–70+) × 10–25 (–50+) mm overall, not lobed or 1–2 (–3) -pinnately lobed, bases cuneate, ultimate margins entire or toothed, abaxial and adaxial faces strigillose to sericeous. Pistillate heads clustered, proximal to staminates; florets 1. Staminate heads: peduncles 0.5–2 mm; involucres shallowly cupshaped, 4–6+ mm diam., strigillose; florets 8–25 (–50). Burs: bodies fusiform to ± pyriform, 4–7+ mm, ± strigillose to pilosulous, spines 8–16+, scattered, stoutly conic or flattened to triquetrous-subulate, 0.5–1.5+ mm, tips straight. 2n = 36.
Phenology: Flowering Apr–Nov.
Habitat: Sandy beaches and strand
Elevation: 0–10 m
B.C., Alaska, Calif., Oreg., Wash., Mexico (Baja California)