The fruit is a woody cup-shaped to barrel-shaped capsule about 6 mm (0.24 in) long and wide with the valves below rim level.

[3][4][5][6] Eucalyptus wimmerensis was first formally described in 1990 by Kevin James Rule in the journal Muelleria from specimens collected in 1964 by James Hamlyn Willis on the Lawloit Range between Nhill and Kaniva.

[4][7] The specific epithet (wimmerensis) refers to the Wimmera region of Victoria where this species occurs.

[4] In 2018, Rule described five subspecies, but the names have not been accepted by the Australian Plant Census:[8] The Wimmera mallee box has a scattered distribution in the Little Desert National Park and adjacent area of South Australia.

Some stands of E. wimmerensis include hybrids, even with the distantly related mallees of the E. dumosa group.