Ironbark © Gwen & Rodger Elliot/RBGV

Ironbark

Eucalyptus tricarpa

Tree up to 35 m tall. The bark is rough over whole trunk and branches, thick, hard, grooved, black (ironbark).

Leaves

Juvenile leaves petiolate (have a stalk), are opposite for a few pairs then alternate, narrowly to broadly tapering to a point, to 17 cm long and 4 cm wide, more or less discolorous, green or greyish-green or glaucous (covered with a a greyish, bluish, or whitish powder or waxy coating).

Adult leaves petiolate, alternate, lance-head shaped, 9.5 – 22 cm long and 1 – 2 cm wide, concolorous (the lower leaf surface distinctly different in colour from the upper), green or glaucous; reticulation dense with numerous intersectional oil glands.

Flowers

It blooms producing inflorescences with flowers that are white, rarely pink. Keep an eye out for the flower caps that cover developing flowers and may fall on the ground at the end of flowering.

Fruits/Seeds

Fruits are truncate (end abruptly as it cut off across the tip), spherical and 1.4 cm long and 1.4 cm diameter. The seed is brown, irregularly egg-shaped and slightly flattened.

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What to Observe

  • First fully open single flower

  • Full flowering (record all days)

  • End of flowering (when 95% of the flowers have faded)

  • No flowering

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When and Where

When To Look

  • Between February and November
  • Late winter for fallen flower caps

Where To Look

  • Victoria and NSW
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What Else?

Similar Species

Ironbark and E. sideroxylon differ from all other ironbarks by the retention of the outer operculum until flowering.