Eucalyptus aequioperta, commonly known as the Welcome Hill gum,[1] is a mallee, sometimes a tree and is endemic to Western Australia. It has rough bark on the lower half of the trunk, lance-shaped leaves, flower buds in groups of between seven and fifteen, white flowers and more or less cup-shaped fruit.
Eucalyptus aequioperta is a mallee or sometimes a tree growing to a height of 5mto8mm (16feetto26feetm) or more, and forms a lignotuber. The bark is a dark grey colour, firm and flaky to fibrous over the lower half of the trunk and extending to large limbs. The bark becomes slightly tessellated on older trees and on higher branches is smooth, dull and pinkish grey to white. Adult leaves are lance-shaped, glossy and a similar green on both sides. The leaf blade is linear to narrow lance-shaped or curved, NaNsigfig=1NaNsigfig=1 long and NaNsigfig=1NaNsigfig=1 wide with a petiole NaNsigfig=1NaNsigfig=1 long. The flower buds are arranged in groups of between seven and fifteen in leaf axils, the groups on a peduncle NaNsigfig=1NaNsigfig=1 long, individual buds on a pedicel NaNsigfig=1NaNsigfig=1 long. The buds are "egg-in-egg cup shaped" or spindle-shaped, NaNsigfig=2NaNsigfig=2 long and NaNsigfig=2NaNsigfig=2 wide. The operculum is NaNsigfig=1NaNsigfig=1 long and equal in width or narrower than the floral cup. The stamens are white. Flowering has been observed in May and the fruit are cup-shaped to cone-shaped with the narrower end towards the base, NaNsigfig=2NaNsigfig=2 long and NaNsigfig=2NaNsigfig=2 wide.[2] [3]
Eucalyptus aequioperta was first formally described by the botanists Ian Brooker and Stephen Hopper in 1993 in the journal Nuytsia. The type specimen was collected by Brooker near Mount Walker, north of Hyden in 1985.[4] According to Brooker and Hopper, the specific epithet (aequioperta) means "equal cover", but Francis Sharr noted that "the precise meaning is unclear".[5]
Eucalyptus aequioperta is part of the subgenus Symphyomyrtus section Dumaria in a sub-group of nine closely related species called series Ovulares. The rough barked members of this series include E. aequioperta, E. baudiniana, E. brachycorys, E. myriadena and E. ovularis and the smooth barked members include E. cyclostoma, E. cylindrocarpa, E. exigua and E. oraria.
The Welcome Hill gum grows in red sand on sandhills in the Avon Wheatbelt, Coolgardie and Mallee biogeographic regions of Western Australia. It is found in an area between Corrigin in the west, Southern Cross and Coolgardie in the east but its distribution is not well known and may extend even further east.
This eucalypt is classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife.