Eucalyptus urnularis is a species of small tree that is endemic to the Northern Territory. It typically grows to a height of and has rough, flaky brownish bark on the trunk, smooth grey bark above. The adult leaves are arranged alternately, the same shade of green on both sides, broadly lance-shaped to curved, long and wide on a petiole long. The flower buds are arranged in leaf axils in groups of seven on an unbranched peduncle long, the individual buds on pedicels long. The fruit is an urn-shaped capsule long and wide.[1]
Eucalyptus × urnularis was first formally described in 1985 by Denis John Carr and Stella Grace Maisie Carr from specimens collected "6.8 km north-west of the El Sharana mine" in 1973. The description was published in Eucalyptus 1 – New or little-known species of the Corymbosae.[2] In Flora of Australia, George Chippendale described this as "a newly described taxon which has not been fully evaluated".