Stems freely branching proximally to distally, terete, 20--50(--70) cm. Leaves: length and width of those on main stem only slightly larger than those on branches; stipules with stipular sheaths inflated 3--5 times stem thickness, 2--9 cm, ligule absent, obscure, or to 0.2 mm; blade narrowly filiform to linear, 1--10(--15) cm ´ 0.2--2.9 mm, apex rounded, obtuse, or slightly notched; veins 1(--3). Inflorescences: peduncles terminal, erect, slender, 3--15 cm; spikes moniliform, 10--80 mm; verticels 3--12. Fruits brown, obliquely obovoid, 3--3.8 mm ´ 2--2.9 mm; beak inconspicuous. 2n = 78.
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