Schoenus quadrangularis Boeckeler

Perennial herb, tufted, up to 0.60(-0.75) m high. Leaf blades absent or minute. Culm scapose, papillate, striate, 1.0-1.5 mm in diam. Inflorescence a much-reduced, linear raceme 12-37 mm long, with clusters of 1-3 sessile, erect spikelets at each of upper 2 or 3 nodes of culm. Subtending bracts erect, basal expanded part green or stramineous, broad, blade leaf-like, margins ciliate. Spikelets compressed, linear, 8-13 x 1.5-2.5 mm, with 1-4 male and 1 bisexual flower; thickened curved prolongation of axis above bisexual flower not adnate to subtending glume. Glumes: fertile lanceolate, ± 7 mm long, keel non-excurrent. Perianth absent. Flowering time Oct. Nutlet elliptical, including style base ± 2.5 mm long, 3-angled with ribs running down edges, bone-white.