The epithet micrantha is derived from the Greek micros (small) and anthos (flower), referring to the small flowers of this species.

Drosera micrantha is known from Western Australia. It is relatively common and widely distributed from Perth to Albany.

It grows in white silica sand soils on the margins of swamps on higher ground; in similar soils scattered throughout Banksia menziesii woodlands; in the Darling Range region east of Perth, but only in deep silica sand areas.

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