Arenaria peploides Linnaeus var. major Hooker, Fl. Bor.-Amer. 1: 102. 1831; A. peploides subsp. major (Hooker) Calder & Roy L. Taylor; A. peploides var. maxima Fernald; A. peploides var. oblongifolia (Torrey & A. Gray) S. Watson; Honckenya oblongifolia Torrey & A. Gray; H. peploides var. major (Hooker) Abrams

Plants with few stems, slender, succulent. Stems prostrate to decumbent, not much-branched, 10-30(-50) cm × 1-3 mm, internodes of main stem 8-40(-60) mm. Leaves: main stem leaves widely spaced, conspicuously larger than those of lateral branches; blade elliptic-obovate to broadly elliptic or narrowly elliptic or oblanceolate, (10-)20-46 × (5-)10-20 mm, apex acute to apiculate. Pedicels (3-)8-16(-26) mm. Flowers: sepals ovate, 4-6 mm, apex apiculate. Capsules 5-8 × 5-10 mm, chartaceous. Seeds reddish to yellowish brown, 2-4 mm, glossy. 2n = 48, 64, 66, 68.

Flowering late spring-summer. Sea beaches, sandy flats, and dunes above high tide; 0-10 m; B.C.; Alaska, Oreg., Wash.; Asia (Japan, Korea, Russia).