Eucalyptus rudis, commonly known as flooded gum or moitch,[2] is a species of small to medium-sized tree endemic to coastal areas near Perth, Western Australia.

[2][6] Eucalyptus rudis was first formally described in 1837 by Stephan Endlicher in Enumeratio plantarum quas in Novae Hollandiae ora austro-occidentali ad fluvium Cygnorum et in sinu Regis Georgii collegit Carolus Liber Baro de Hügel authored by Endlicher, Eduard Fenzl, George Bentham and Heinrich Wilhelm Schott from samples collected by Charles von Hügel around the Swan River Colony.

[7][8] In 1993, Ian Brooker and Stephen Hopper described two subspecies and the names have been accepted by the Australian Plant Census:[9] The tree is widespread from the Eneabba district (29° S.

southwards in the Darling Range, west central wheatbelt and high rainfall areas of south-west Western Australia commonly on watercourses, swampy ground or very occasionally on granite rock.

[15] Flooded gum occurs typically in open woodlands, associated species include with wandoo, Corymbia calophylla and Eucalyptus marginata.

It is also being assessed as a fast-growing source of biomass for bioenergy and reconstituted wood products in the South West region.