Commersonia erythrogyna, commonly known as Trigwell's rulingia,[2] is a species of flowering plant in the family Malvaceae and is endemic to a restricted part of the south-west of Western Australia.

The edges of the leaves sometimes have irregular teeth, and both surfaces are covered with fine, white, star-shaped hairs.

Flowering occurs from August to October and the fruit is a hairy, bristly capsule 8–10 mm (0.31–0.39 in) in diameter.

[2][3] Commersonia erythrogyna was first formally described in 2011 by Carolyn F. Wilkins and the description was published in Australian Systematic Botany from specimens collected near Boyup Brook in 2003.

[4] The specific epithet (erythrogyna) means "red female organs", referring to the reddish hairs on the ovary.