Eucalyptus caesia, commonly known as caesia or gungurru, is a species of mallee that is endemic to the south-west of Western Australia. It has smooth reddish brown bark at first, later shedding in curling flakes, lance-shaped, sometimes curved adult leaves, club-shaped flower buds covered with a waxy, bluish white bloom, pink stamens with yellow anthers and urn-shaped fruit.
Eucalyptus caesia is a mallee that typically grows to a height of 2 to 14 metres (6.6 to 45.9 ft) and forms a lignotuber. The bark is smooth reddish brown at first and is shed in curling longitudinal flakes known as "minnirichi". Young branches are shiny red, covered with a waxy, bluish white bloom. Young plants and coppice regrowth have thick, glossy green, heart-shaped leaves 25โ80 mm (0.98โ3.1 in) long and 25โ60 mm (1โ2 in) wide that have a petiole. Adult leaves are lance-shaped to curved, mostly 80โ110 mm (3.1โ4.3 in) long and 15โ25 mm (0.6โ1 in) wide on a petiole 10โ35 mm (0.39โ1.4 in) long. The flower buds are arranged in leaf axils in groups of three on an unbranched peduncle 15โ35 mm (0.59โ1.4 in) long, the individual flowers on pedicels 15โ22 mm (0.59โ0.87 in) long. Mature flower buds are oval or pear-shaped, covered with a whitish waxy bloom, 17โ30 mm (0.67โ1.2 in) long and 10โ13 mm (0.39โ0.51 in) wide with a conical operculum. Flowering mainly occurs between May and September and the flowers have pink stamens with yellow anthers on the tip. The fruit is a woody bell-shaped or urn-shaped capsule 15โ25 mm (0.59โ0.98 in) long and 18โ23 mm (0.71โ0.91 in) wide on a peduncle 13โ33 mm (0.51โ1.3 in) long.