It has reddish brown, minni ritchi bark, narrow lance-shaped to egg-shaped adult leaves, flower buds in groups of seven, white flowers and conical to hemispherical fruit.Eucalyptus ewartiana is a mallee that typically grows to a height of 2–7 m (6 ft 7 in – 23 ft 0 in) and has reddish brown minni-ritchi type bark and forms a lignotuber.

[2][3][4] Eucalyptus ewartiana was first formally described in 1919 by Joseph Maiden from a specimen he collected near Pindar in 1909.

The description was published in Journal and Proceedings of the Royal Society of New South Wales.

[3][6] Ewart's mallee is found on sandplains and among granite outcrops and is spread throughout the Mid West, Wheatbelt, Pilbara and Goldfields-Esperance regions of Western Australia where it grows in loamy-sandy soils.

[2][4] This eucalypt is classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife.