Persicaria prostrata, basionym Polygonum prostratum, is a species of flowering plant in the family Polygonaceae, native to Australia[3] and perhaps New Zealand.

[5] Leaves lanceolate to narrowly elliptic, 1–5 cm long, 3–10 mm wide with short hairs on the margins and main veins.

[5][6] Compact short cylindrical flower spikes from 0.6–4 cm long and 4–7 mm diameter.

[6] Persicaria prostrata grows on banks of streams, ground-tanks and ditches[6] and on heavy soils in areas prone to inundation.

[5] The plant was first described in 1810 by Robert Brown as Polygonum prostratum,[7][8] but was assigned to the genus Persicaria by Jiří Soják in 1974.