Eucalyptus erythrocorys

Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Myrtales
Family: Myrtaceae
Genus: Eucalyptus
Species: E. erythrocorys
Binomial name
Eucalyptus erythrocorys
F. Muell.
E. erythrocorys, field distribution

Eucalyptus erythrocorys, commonly known as Illyarrie, Red-capped gum or Helmet nut gum,[1] is a mallee from Western Australia. The common name Illyarrie is the Noongar peoples name for the plant.[2]

It is a small tree typically growing to a height of 3 to 8 metres (10 to 26 ft). The bark is smooth[3] with a creamy colour but can have a few rough brown coloured patches where it persists on the trunk instead of being shed. The adult leaves are dark green sickle-shaped.

It blooms between February and April and produces yellow flowers.[3] The Illyarrie is notable for its big flowers which can be 5 cm across or more. They are bright yellow, being covered by a bright-red cap (operculum) in bud - giving the epithet erythrocorys (red-helmet). The stamens are arranged in 4 bundles and the fruits are ribbed with a red top.

The species has a limited distribution north of Perth where it is found on undulating limestone ridges and outcrops growing in sandy alkaline soils near Dongara as well as north of Kalbarri National Park.[1]

Flowers and leaves of an Illyarrie (Eucalyptus erythrocorys), Margaret River, Western Australia
Flower buds and opercula


  1. 1 2 "Eucalyptus erythrocorys". Austrlain Native Plants Society. 2016. Retrieved 30 November 2016.
  2. "Noongar names for plants". Retrieved 30 November 2016.
  3. 1 2 "Eucalyptus erythrocorys". FloraBase. Western Australian Government Department of Parks and Wildlife.
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