Cyperus dubius Rottb. APNI*
Description: Tufted perennial with short rhizome.
Culms triquetrous, smooth, apparently swollen for some distance at base because of numerous persistent whitish sheaths, 10–45 cm high, to 2 mm diam.
Leaves not septate-nodulose, longer than culms, 2–5 mm wide. Inflorescence simple, with 1–6 dense sessile, clustered, broad-ovoid spikes, 1–2 cm long and diam.; involucral bracts leaf-like, 3–5 exceeding inflorescence. Spikelets subterete, numerous per spike, 4–7 mm long, c. 1.5 mm diam., 2–6-flowered; rachilla broadly winged; spikelet falling as unit. Glumes obtuse, with sides 7–9-nerved, 2.5–4 mm long, white to straw-coloured. Stamens 3. Style 3-fid.
Nut trigonous, ellipsoid, about half the length of glume, 1.5–2.5 mm long, c. 0.8 mm diam., dark brown.
Distribution and occurrence: Known from near Newcastle, Port Stephens and Chatswood in Sydney. Native of Afr. & Asia.
Grows in sandy disturbed areas.
NSW subdivisions: *NC, *CC
Text by K. L. Wilson (1993); edited KL Wilson (Jan 2019)
Taxon concept: Flora of NSW 4 (1993)
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