A marlock or moort^[1] 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)