Eucalyptus rhodantha, commonly known as rose mallee, is a species of straggly mallee or shrub that is endemic to Western Australia. It has smooth bark, a crown composed entirely of heart-shaped, sessile juvenile leaves arranged in opposite pairs, single flower buds in leaf axils, red flowers and pendent, hemispherical to conical fruit.
Eucalyptus rhodantha is a straggly mallee or a shrub, that typically grows up to a height of 1.5–4 m (4 ft 11 in–13 ft 1 in) and forms a lignotuber. It has smooth greyish a pinkish bark. The crown is composed entirely of juvenile leaves that are sessile, arranged in opposite paris with their bases surrounding the stem. The leaves are the same shade of dull silver-grey or glaucous on both sides, egg-shaped, 45–80 mm (1.8–3.1 in) long and 30–75 mm (1.2–3.0 in) wide. The flower buds are arranged singly in leaf axils on a down-turned, peduncle 10–20 mm (0.39–0.79 in) long and a pedicel 8–20 mm (0.31–0.79 in) long. Mature buds are egg-shaped, glaucous, 28–53 mm (1.1–2.1 in) long and 23–37 mm (0.91–1.46 in) wide with a beaked operculum 20–32 mm (0.79–1.26 in) long. Flowering occurs from July or September to December or January and the flowers are red, sometimes creamy white. The fruit is a woody, down-turned, hemispherical to conical capsule 16–28 mm (0.63–1.10 in) long and 33–45 mm (1.3–1.8 in) wide with the valves protruding.