Cent. Pl. 2: 6 (1756) APNI
Establishment means:Native (naturalised in part(s) of state)
Tufted annual with reddish roots. Culms triquetrous, smooth, 10–50 cm high, 2–3 mm diam. Leaves not septate-nodulose, shorter than or not much exceeding culms, 2–5 mm wide, sometimes reduced to sheaths. Inflorescence simple or rarely compound with 5–11 primary branches to 5 cm long, sometimes head-like; digitate clusters dense, 0.8–1.5 cm diam.; involucral bracts leaf-like, 1 or 2 longer than the inflorescence and usually one erect. Spikelets flattened, numerous per cluster, 2.5–5 mm long, c. 1 mm wide in side view, 10–30-flowered; rachilla not winged, persistent; glumes very obtuse, with 3-nerved keel, very dark red-brown or sometimes paler, with white margins, 0.6–0.9 mm long, c. 1 mm wide; stamens 1, rarely 2. Nut triquetrous, ellipsoid to obovoid, straw-coloured, almost as long as glume, 0.5–0.7 mm long, c. 0.3 mm diam. Flowers spring–summer.
CVU, GipP, Gold, MuF, MuM, MSB, NIS, RobP, VRiv, VVP. All mainland States. Pantropical. Locally common in seasonally wet, often disturbed open situations along the Murray River and its tributaries, recorded once as a nursery weed in Parkville, an inner Melbourne suburb. .
|Bioregion||Occurrence status||Establishment means|
|Victorian Volcanic Plain||present||native|
|Murray Scroll Belt||present||native|
|Central Victorian Uplands||present||native|
|Northern Inland Slopes||present||native|
|New South Wales|
|Australian Capital Territory|