The Red-capped Gum (Eucalyptus erythrocorys) is one of the beautiful flowering eucalypts that flowers during summer through to autumn months – seen flowering in January, February, April and September.

Grouped in threes, the flowers that start off green, emerge from rectangular shaped buds with a wart looking vivid red cap (the red caps can be seen strewn on the ground). The yellow flowers can be up to 7 cm across with four tufts of golden stamens at each of the “corners”, giving the flower a squarish look. The seed capsule are large helmet-shaped fruits.

 A mallee shrub or small tree that can grow to 4 metres in height, forming a lignotuber. The bark is rough and creamy under the loose brown bark.

A small tree of subcoastal areas north of Perth, it is a popular street tree in many South Australia and Western Australia country towns.

Common name
Illyarrie, Red-capped Gum, Helmet Nut Gum.


  • Scientific classification
  • Kingdom: Plantae
  • Clade: Tracheophytes
  • Clade: Angiosperms
  • Clade: Eudicots
  • Clade: Rosids
  • Order: Myrtales
  • Family: Myrtaceae
  • Genus: Eucalyptus
  • Species: E. erythrocorys
  • Binomial name: Eucalyptus erythrocorys