Craven & R.D.Edwards Phymatocarpus maxwellii is a plant in the myrtle family, Myrtaceae and is endemic to the south-west of Western Australia.

The individual capsules are about 2.5 millimetres (0.1 in) in diameter and are arranged in clusters which are rough or lumpy on the outer surface.

[6] Phymatocarpus maxwellii occurs in and between the Mount Barker East and the Israelite Bay districts[7] in the Coolgardie, Esperance Plains and Mallee biogeographic regions.

[8] It grows in a wide range of situations but mostly in sand on sandplains and depressions that are wet in winter.

[9] Phymatocarpus maxwellii is classified as "not threatened" by the Western Australian government Department of Parks and Wildlife.