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

It is a tuberous, perennial herb or shrub with linear leaves and white flowers in a compound umbel.

Platysace effusa is a tuberous, perennial herb or shrub that typically grows to a height of 10–75 cm (3.9–29.5 in)[2] and has wand-like branches.

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

[7] This species of platysace grows on sandplains, sand dunes and hills in the Avon Wheatbelt, Coolgardie, Esperance Plains, Geraldton Sandplains, Jarrah Forest and Mallee bioregions of south-western Western Australia and is listed as "not threatened".