Eucalyptus leptophylla, commonly known as the March mallee, slender-leaved red mallee or narrow-leaved red mallee, is a species of mallee that is endemic to inland Australia. It has smooth greyish bark, linear to narrow lance-shaped, oblong or curved adult leaves, flower buds in groups of between seven and thirteen, creamy white flowers and cup-shaped, barrel-shaped or hemispherical fruit.

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