Eucalyptus rudis, commonly known as flooded gum or moitch, is a species of small to medium-sized tree endemic to coastal areas near Perth, Western Australia. The Noongar names for the tree are colaille, gooloorto, koolert and moitch. This tree has rough, fibrous bark on the trunk and large branches, smooth greyish bark above, lance-shaped to curved adult leaves, flower buds in groups of between seven and eleven, white flowers and bell-shaped, cup-shaped or hemispherical fruit.