Eucalyptus yumbarrana, commonly known as the Yumbarra mallee[1] is a species of mallee that is endemic to South Australia. It has rough, flaky bark on the lower trunk, smooth bark above, egg-shaped to lance-shaped adult leaves, flower buds in groups of seven, creamy white to yellow flowers and shortened spherical to cup-shaped fruit.
Eucalyptus yumbarrana is an erect to sprawling mallee that typically grows to a height of, rarely a tree to, and forms a lignotuber. It has fibrous-stringy bark on the trunk and lower stems, smooth grey to cream-coloured bark above and that is shed in ribbons that often hang in the upper branches. Young plants and coppice regrowth have stems that are square in cross-section, and leaves that are dull bluish green, elliptical to egg-shaped, or round, long and wide. Adult leaves are the same glossy green on both sides, egg-shaped to lance-shaped or broadly lance-shaped, long and wide on a petiole long. The flower buds are arranged in leaf axils on an unbranched peduncle long, the individual buds on pedicels long. Mature buds are oval, long and wide with a beaked operculum long. Flowering occurs from July to October and the flowers are creamy white to yellow. The fruit is a woody shortened spherical to cup-shaped capsule long and wide with the valves protruding.[2] [3] [4] [5]
Eucalyptus yumbarrana was first formally described in 1979 by Clifford David Boomsma in the Journal of the Adelaide Botanic Gardens from specimens collected in Yumbarra Conservation Park in 1977.[6] [7] The specific epithet (yumbarrana) is a reference to the type location.
Eucalyptus yumbarrana is often found in the swales between sand dunes in open shrubland in arid areas in the Yumbarra and Koonibba areas.