The epithet coomallo appears to be derived from a Noongar indigenous Australian word. Its meaning is unknown. Since colonisation, Coomallo has been the name given to Coomallo Creek, named by a surveyor in 1880. Hence, Coomallo Pool, Coomallo phone exchange and Coomallo Nature Reserve, on the edge of which this species was rediscovered.

Drosera coomallo is known from Western Australia, with records around Badgingarra, Cataby and Coomallo.

This species grows in laterite pebbles with a little silica sand over laterite sheet rock on the slopes of lateritic hills.

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