Slender close-packed clumps; rhizome short. Stems 45-120 cm × (1)-1.5-2.5 mm, hard, erect, bluish-green, ridged, dull, pith irregularly interrupted. Basal sheaths closely appressed, loose, dark red-purple, ± black below. Inflorescence 5-10 cm long with up to 5 very slender erect branches, 1-2 longer than rest and branched again. Flowers small, clustered at branchlet tips. Tepals 1.5-2 mm long, ± equal, acute. Stamens 3-(4). Capsule 2-2.5 mm long, usually noticeably > tepals, ovoid, tapered to subacute top, reddish-brown.
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