Commelina lanceolata is a plant in the family Commelinaceae native to Western Australia, the Northern Territory, Queensland and New South Wales in Australia.

It is a scrambling perennial herb first described by the Scottish botanist Robert Brown in 1810, who published his description in his work Prodromus Florae Novae Hollandiae et Insulae Van Diemen.

It is common on floodplains, growing when floodwaters have receded, and along watercourses, sometimes being found in shallow water.

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