Stylidium diffusum is a species of dicotyledonous plant in the family Stylidiaceae.

Linear or deltate leaves, about 5-20 per plant, are scattered along the elongate, glabrous stem.

Flowers are pink, white, or mauve and bloom from March to September in the southern hemisphere.

S. diffusum's distribution is scattered along the east coast of Queensland and has populations recorded from Elcho Island and Groote Eylandt in the Northern Territory in Australia.

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