Eucalyptus aequioperta

Welcome Hill gum
	Eucalyptus aequioperta near Hyden
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Myrtales
Family:	Myrtaceae
Genus:	Eucalyptus
Species:	E. aequioperta
Binomial name
	Eucalyptus aequioperta; Brooker & Hopper[1]

Eucalyptus aequioperta, commonly known as the Welcome Hill gum,[2] 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.

E. aequioperta flower buds

Description

Eucalyptus aequioperta is a mallee or sometimes a tree growing to a height of 5 to 8 metres (16 to 26 ft) 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, 60–110 mm (2–4 in) long and 6–12 mm (0.2–0.5 in) wide with a petiole 8–17 mm (0.3–0.7 in) long. The flower buds are arranged in groups of between seven and fifteen in leaf axils, the groups on a peduncle 5–15 mm (0.2–0.6 in) long, individual buds on a pedicel 2–5 mm (0.08–0.2 in) long. The buds are "egg-in-egg cup shaped" or spindle-shaped, 5–7 mm (0.20–0.28 in) long and 2.5–3.5 mm (0.098–0.14 in) wide. The operculum is 1.5–3 mm (0.06–0.1 in) 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, 4–5 mm (0.16–0.20 in) long and 5–6 mm (0.20–0.24 in) wide.[3][4][5]

Taxonomy

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][1] According to Brooker and Hopper, the specific epithet (aequioperta) is "from the Latin aequi - equal and opertus - cover, referring to the operculum shape, in relation to the hypanthium".[4] The proper classical Latin word for "equal" is however aequus.[6] Francis Sharr noted that "the precise meaning is unclear".[7]

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.[3]

Distribution and habitat

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.[5][3]

Conservation status

This eucalypt is classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife.[5]

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References

"Eucalyptus aequioperta". APNI. Retrieved 17 February 2019.
"Amendments to the list of threatened ecological communities under section 181 of the Environment Protection and biodiversity Conservation Act 1999 (EC128)". Commonwealth of Australia. 26 November 2015. Retrieved 24 October 2016.
"Eucalyptus aequioperta". Euclid: Centre for Australian National Biodiversity Research. Retrieved 17 February 2019.
Brooker, M. Ian; Hopper, Stephen (1993). "New series, subseries, species and subspecies of Eucalyptus (Myrtaceae) from Western Australia and South Australia". Nuytsia. 9 (1): 58–59. Retrieved 17 February 2019.
"Eucalyptus aequioperta". FloraBase. Western Australian Government Department of Parks and Wildlife.
Lewis, C.T. & Short, C. (1879). A Latin dictionary founded on Andrews' edition of Freund's Latin dictionary. Oxford: Clarendon Press.
Francis Aubie Sharr (2019). Western Australian Plant Names and their Meanings. Kardinya, Western Australia: Four Gables Press. p. 128. ISBN 9780958034180.

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[APNI-1] "Eucalyptus aequioperta". APNI. Retrieved 17 February 2019.

[2] "Amendments to the list of threatened ecological communities under section 181 of the Environment Protection and biodiversity Conservation Act 1999 (EC128)". Commonwealth of Australia. 26 November 2015. Retrieved 24 October 2016.

[CANBR-3] "Eucalyptus aequioperta". Euclid: Centre for Australian National Biodiversity Research. Retrieved 17 February 2019.

[Nuytsia-4] Brooker, M. Ian; Hopper, Stephen (1993). "New series, subseries, species and subspecies of Eucalyptus (Myrtaceae) from Western Australia and South Australia". Nuytsia. 9 (1): 58–59. Retrieved 17 February 2019.

[FloraBase-5] "Eucalyptus aequioperta". FloraBase. Western Australian Government Department of Parks and Wildlife.

[Lewis_&_Short-6] Lewis, C.T. & Short, C. (1879). A Latin dictionary founded on Andrews' edition of Freund's Latin dictionary. Oxford: Clarendon Press.

[Sharr-7] Francis Aubie Sharr (2019). Western Australian Plant Names and their Meanings. Kardinya, Western Australia: Four Gables Press. p. 128. ISBN 9780958034180.