Plants perennial, glabrous, with vertical rootstock, occasionally with short-creeping rhizomes. Stems ascending or erect occa-sionally almost procumbent, usually producing axillary shoots below 1st-order inflorescence or at proximal nodes, 30-60(-80) cm. Leaf blades linear-lanceolate, 10-20(-22) × 1-3.5(-4.5) mm, usually ca. 7-10 times as long as wide, widest near middle, thick, coriaceous, base cuneate, margins entire, flat or slightly undulate, apex acute. Inflorescences terminal and axillary, terminal usually occupying distal 5-3 of stem, rather dense or interrupted in proximal 1/2, usually broadly paniculate (distal branches simple, proximal ones usually with few 2d-order branches). Pedicels articulated in proximal 3 or almost near base, filiform, 4-6 mm, not more than 2-2.5 times as long as inner tepals, articulation indistinctly swollen. Flowers 10-20 in whorls; inner tepals, broadly ovate-triangular or almost deltoid, occasionally broadly triangular, (2.5-)3-4 × 2-3.5 mm, base truncate or round, occasionally indistinctly cordate, margins entire or indistinctly erose, apex obtuse or subacute; tubercles 3, equal or subequal, all tubercles, or at least largest tubercle pale, subequal to inner tepals or slightly narrower than inner tepals, often minutely verrucose. Achenes brown or dark reddish brown, 2-3 × 1-1.5 mm. 2n = 20.
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Branching perennial from a white root, ascending, or decumbent at base, 2–7 dm; lvs flat, glaucous, narrowly lanceolate, acute to long-cuneate at base; infl 1–2 dm, with numerous widely divergent branches; pedicels 2–4 mm, jointed just above the base; valves broadly ovate, 3–4 × 2–3 mm, obtuse, broadly truncate at base, the margins scarcely projecting; grains 3, turgid, nearly as long as the valves and more than half as wide; 2n=20. Sandy or rocky beaches and coastal swamps; Nf. and Que. to L.I. Appears to intergrade with no. 13 [Rumex salicifolius Weinm.].
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