| Eucalyptus erythrocorys|
|E. erythrocorys, field distribution|
It is a small tree typically growing to a height of 3 to 8 metres (10 to 26 ft). The bark is smooth 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. 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.
- Article with Pictures from the Winter 2002 edition of the Mildred E. Mathias Botanical Garden newsletter
- Holliday, I. A field guide to Australian trees (3rd edition), Reed New Holland, 2002
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