Persoonia laxa is an extinct shrub of the family Proteaceae native to the Sydney region in eastern Australia. It was only known from two specimens, the holotype found in Newport in 1907, and the other specimen collected in Manly the following year, with no individuals being found since. It was declared extinct by the Environmental Protection and Biodiversity Conservation Act 1999 in 2000 and by the International Union for Conservation of Nature in 2020.

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