Australian Tropical Rainforest Plants - Online edition

Cyperus aquatilis R.Br.

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Herbarium specimen. © DERM

Brown, R. (1810) Prodromus Florae Novae Hollandiae : 213.

Common name

Flat Sedge


Slender tufted annual. Culms triquetrous, smooth, 7-50 cm tall.


Leaves mostly shorter than culms; leaf blades 0.5-4 mm wide. Leaf sheaths with hayline margin.


Inflorescence simple or compound, with 2-6 primary branches up to 15 cm long; digitate clusters about 15 mm diameter; involucral bracts leaf-like, 1 or rarely 2 shorter but sometimes as long as the inflorescence. Rachilla straight, wingless. Spikelets flattened, solitary or 2-8 per cluster, 4-18 x 2-3 cm, 10-30 flowered. Glumes acute, 1.5-2 mm long, whitish, often reddish brown with a green keel and with 1 prominent vein on each side


Nut triquetrous, about half as long as the glume, whitish to pale brown, glabrous, about 0.6 x 0.5 mm.


Features not available.

Distribution and Ecology

Occurs in WA, NT, CYP, NEQ, CEQ and NSW. Altitudinal range from 20-1150 m. Grows in rainforest, notophyll vine forest, common in swampy places, on creek banks and in creek beds, also in various types of woodland. Also occurs in Indonesia and New Guinea.

Cyperus trinervis var. aquatilis (R.Br.) Kuk., Das Pflanzenreich 101: 294(1936).
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