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Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Rosids
Cladus: Eurosids II
Ordo: Myrtales

Familia: Myrtaceae
Subfamilia: Myrtoideae
Tribus: Eucalypteae
Genus: Eucalyptus
Subgenus: E. subg. Symphyomyrtus
Sectio: E. sect. Bisectae
Series: E. ser. Curviptera
Subseries: E. subser. Glomerosae
Species: Eucalyptus × impensa
Name

Eucalyptus × impensa Brooker & Hopper, Nuytsia 9: 35. 1993.
Formula hybridae: Eucalyptus macrocarpa Hook. × Eucalyptus pyriformis Turcz.

References

Brooker, M.I.H. & Hopper, S.D. 1993. Nuytsia 9: 35.

Eucalyptus impensa, commonly known as the Eneabba mallee,[2] is a species of straggly mallee that is endemic to a small area of Western Australia. It has smooth bark, dull, light green, egg-shaped to broadly lance-shaped leaves, flower buds arranged singly in leaf axils, pink flowers and relatively large, flattened hemispherical fruit.

Description

Eucalyptus impensa is a straggly mallee that typically grows to a height of 1.5 m (4 ft 11 in) and forms a lignotuber. It has smooth grey and brownish bark. Young plants and coppice regrowth have leaves arranged more or less in opposite pairs, broadly egg-shaped, 60–110 mm (2.4–4.3 in) long and 45–65 mm (1.8–2.6 in) wide. Adult leaves are also arranged more or less in opposite pairs, broadly lance-shaped to egg-shaped, 105–140 mm (4.1–5.5 in) long and 40–80 mm (1.6–3.1 in) wide on a thick petiole up to 10 mm (0.39 in) long. The flower buds are arranged singly in leaf axils on a thick peduncle 15–20 mm (0.59–0.79 in) long. The mature bud is oval to more or less spherical, 40–50 mm (1.6–2.0 in) long and 25–35 mm (0.98–1.38 in) wide with a beaked operculum about 25 mm (0.98 in) long. Flowering has been recorded in May, June and July and the flowers are pink. The fruit is a woody, flattened hemispherical capsule, 20–30 mm (0.79–1.18 in) long and 48–55 mm (1.9–2.2 in) wide with the valves protruding above the rim.[2][3][4]
Taxonomy and naming

Eucalyptus impensa was first formally described in 1993 by Ian Brooker and Stephen Hopper from a specimen collected from near Warradarge in 1987. The description was published in the journal Nuytsia.[4][5] The specific epithet is from the Latin impensus, meaning 'ample', 'great', 'large' or 'strong', referring to the leaves and fruit of this species.[4][6]
Distribution and habitat

The Eneabba mallee is restricted to six populations that occur over a range of about 3 km (1.9 mi) near Eneabba. It grows in open shrub mallee over low heath on undulating plains and breakaways.[2]
Conservation status

This mallee is listed as "Endangered" under the Australian Government Environment Protection and Biodiversity Conservation Act 1999 and as "Threatened Flora (Declared Rare Flora — Extant)" by the Department of Environment and Conservation (Western Australia). An "interim recovery plan" has been prepared.[2][7][8]

In 2009, eight populations of this mallee were known and counts suggested that the total number of mature plants was about 114. The main threats to the species are insect damage, inappropriate fire regimes, firebreak maintenance and disease. The species as a whole is threatened by its narrow range and lack of recruitment.[2][7]
See also

List of Eucalyptus species

References

"Eucalyptus impensa". Australian Plant Census. Retrieved 28 July 2019.
"Conservation Advice: Eucalyptus impensa Eneabba mallee" (PDF). Australian Government Department of the Environment. Retrieved 28 July 2019.
"Eucalyptus impensa". Euclid: Centre for Australian National Biodiversity Research. Retrieved 1 June 2020.
Brooker, M. Ian H.; Hopper, Stephen (1993). "New series, subseries, species and subspecies of Eucalyptus (Myrtaceae) from Western Australia and from South Australia". Nuytsia. 9 (1): 35–37. Retrieved 28 July 2019.
"Eucalyptus impensa". APNI. Retrieved 28 July 2019.
Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 435.
Stack, Gillian; Broun, Gina. "Interim Recovery Plan No. 179: Eneabba mallee (Eucalyptus impensa) Interim Recovery Plan 2004-2009" (PDF). Australian Government Department of the Environment. Retrieved 28 July 2019.
"Eucalyptus impensa". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.

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