A marlock or moort is a shrubby or small-tree form of Eucalyptus found in Western Australia. Unlike the mallee, it is single-stemmed and lacks a lignotuber. It has a dense canopy of leaves which often extends to near ground level.

Marlock species include: Bald Island marlock (Eucalyptus conferruminata or Eucalyptus lehmannii) black marlock, black-barked marlock (Eucalyptus redunca) Comet Vale marlock (Eucalyptus comitae-vallis) flowering marlock, long-flowered marlock, long-leaved marlock (Eucalyptus macrandra) forrest's marlock (Eucalyptus forrestiana) limestone marlock (Eucalyptus decipiens) Quoin Head marlock (Eucalyptus mcquoidii)

Moorts are a form of marlock with smooth, grey bark including the following species: moort or round-leaved moort (Eucalyptus platypus) red-flowered moort (Eucalyptus nutans) Stoate's moort (Eucalyptus stoatei)

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