Platysace filiformis is a species of flowering plant in the family Apiaceae and is endemic to the south-west of Western Australia.

It is an erect or sprawling, perennial herb or shrub with flat, winged stems with few leaves and white or cream-coloured flowers arranged in compound umbels.

Platysace filiformis is an erect or sprawling perennial herb or shrub, with rigid stems 15–60 cm (5.9–23.6 in) high.

[2] This species was first formally described in 1845 by Alexander Andrejewitsch von Bunge who gave it the name Trachymene filiformis in Lehmann's Plantae Preissianae from specimens collected near Perth in 1839.

[4][5] In 1939, Cecil Norman transferred the species to Platysace as P. filiformis in the Journal of Botany, British and Foreign.