Eucalyptus longicornis, commonly known as red morrel,[2] morryl, poot or pu, is a species of large tree that is endemic to the south-west of Western Australia.

The dark red loams, that are rich in minerals and often slightly saline, associated with the decomposition of the fine-grained dolerite gneiss dykes and outcropping units of the Yilgarn Block best suit the tree.

[13] The species is usually found in woodland communities where it is an overstorey tree, in an unmixed stand or with E. salmonophloia and either E. melanoxylon, E. wandoo, E. loxophleba, E. astringens or E. kondininensis.

Associated species in the understorey include Sclerolaena diacantha, Lycium australe, Acacia merrallii, Melaleuca pauperiflora and Rhagodia drummondii.

[2] Eucalyptus longicornis is a tall tree with potential to be cultivated on highly alkaline, saline and clayey soils.