Caespitose perennial, sometimes also with rhizomes and/or stolons. Culms (6–) 18–90 cm high; mid-culm internodes glabrous. Young shoots extravaginal and intravaginal. Leaves: basal sheaths with margins free, glabrous or minutely scabrous between nerves, sometimes purplish; ligule 0.4–1 mm long, obtuse to truncate, apically ciliolate, abaxially puberulous; blade narrowly inrolled or occasionally merely folded, 29.5–90 cm long, often exceeding culm, 0.4–1.1 mm wide (to 2 mm when flattened), usually rather stiff and sharp-tipped, adaxially scabrous to puberulous, abaxially glabrous. Inflorescence contracted, 5.5–21 cm long, branches usually with spikelets to near base. Spikelets (3.8–) 4.3–9.8 mm long, with 2–6 (–7) bisexual florets. Glumes: lower glume 1 or 3-nerved, 2.6–4.7 mm long; upper glume 2.6–5.3 mm long. Web usually well-developed. Lemma 2.8–5.7 mm long, 5 (–7)-nerved, with nerves villous toward base; intercostal regions puberulous or scaberulous or glabrous. Anthers 1.7–3 mm long.
Usually strictly coastal onocean foreshores and bordering estuaries, occasionally ascending the heights ofcoastal sand-dunes and cliffs, rarely recorded from beyond the saline influenceof the coast.
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