Eucalyptus risdonii

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Risdon peppermint
Eucalyptus risdonii.jpg
Eucalyptus risdonii in the ANBG
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Myrtales
Family: Myrtaceae
Genus: Eucalyptus
Species:
E. risdonii
Binomial name
Eucalyptus risdonii
Synonyms [1]
  • Eucalyptus hypericifolia Grimwade nom. inval., pro syn.
  • Eucalyptus risdoniHook.f. orth. var.
  • Eucalyptus risdoniiHook.f. var. risdonii

Eucalyptus risdonii, commonly known as the Risdon peppermint, [2] is a species of small tree that is endemic to a small area in southern Tasmania. It has smooth bark, a crown composed mostly of sessile, glaucous, egg-shaped juvenile leaves arranged in opposite pairs. The flower buds are arranged in groups of between nine and fifteen and the fruit are cup-shaped, conical or hemispherical.

Description

Flowers Eucalyptus risdonii flowers.jpg
Flowers

Eucalyptus risdonii is a tree that typically grows to a height of 8 m (26 ft) and forms a lignotuber. [2] [3] [4]

The bark is smooth, grey, yellow, white or cream-coloured. Young plants and coppice regrowth have glaucous, sessile, egg-shaped leaves arranged in opposite pairs with their bases joined, 20–50 mm (0.79–1.97 in) long and wide. The crown is composed mostly of juvenile leaves. Adult leaves, when formed, are arranged alternately, dull green, lance-shaped, up to 100 mm (3.9 in) long and 20 mm (0.79 in) wide. [2] [3] [4]

The flower buds are arranged in leaf axils, on an unbranched peduncle 5–25 mm (0.20–0.98 in) long, the individual buds on pedicels 2–5 mm (0.079–0.197 in) long. Mature buds are oval to club-shaped, 4–7 mm (0.16–0.28 in) long and 3–5 mm (0.12–0.20 in) wide with a rounded to flattened operculum. Flowering occurs from November to January and the flowers are white. [2] [3] [4]

The fruit is a woody cup-shaped, conical or hemispherical capsule 6–10 mm (0.24–0.39 in) long and 6–9 mm (0.24–0.35 in) wide with the valves below rim level. [2] [3] [4]

Taxonomy and naming

Eucalyptus risdonii was first formally described in 1847 by Joseph Dalton Hooker in the London Journal of Botany. [5] [6] The specific epithet (risdonii) refers to the locality Risdon, where the type specimen was found. [2]

Distribution and habitat

The Risdon peppermint is only known from the dry slopes on the eastern side of the River Derwent near Risdon and Grass Tree Hill. It grows in low, open forest on sunny, north-west facing ridges. [4] [7]

This species is reported to be a juvenilised form of its sister species, E. tenuiramis . [8]

Conservation status

This species is classed as "rare" under the Tasmanian Government Threatened Species Protection Act 1995 . [4]

Related Research Articles

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<i>Eucalyptus melanophloia</i> Species of eucalyptus

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<i>Eucalyptus macrocarpa</i> Species of eucalyptus

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<i>Eucalyptus nova-anglica</i> Species of eucalyptus

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<i>Eucalyptus radiata</i> Species of eucalyptus

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<i>Eucalyptus cinerea</i> Species of eucalyptus

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<i>Eucalyptus cordata</i> Species of eucalyptus

Eucalyptus cordata, commonly known as the heart-leaved silver gum is a shrub to medium-sized tree that is endemic to Tasmania. It has smooth bark throughout, mostly only juvenile, more or less heart-shaped, glaucous leaves, glaucous flower buds arranged in groups of three, white flowers and cylindrical or hemispherical fruit.

<i>Eucalyptus pulverulenta</i> Species of eucalyptus

Eucalyptus pulverulenta, commonly known as silver-leaved mountain gum, is a species of straggly tree or mallee that is endemic to southern New South Wales. It has smooth bark, egg-shaped, heart-shaped or round, sessile leaves arranged in opposite pairs, flower buds in groups of three, white flowers and cup-shaped to cylindrical fruit.

<i>Eucalyptus rubida</i> Species of eucalyptus

Eucalyptus rubida, commonly known as candlebark, ribbon gum or white gum, is a species of small to medium-sized tree that is endemic to south-eastern Australia. It has smooth bark, sometimes with rough bark at the base, lance-shaped or curved adult leaves, flower buds in groups of three, white flowers and cup-shaped, hemispherical or bell-shaped fruit.

<i>Eucalyptus globulus <span style="font-style:normal;">subsp.</span> bicostata</i> Subspecies of eucalyptus

Eucalyptus globulus subsp. bicostata, commonly known as the southern blue gum, eurabbie, blue gum or Victorian blue gum, is a subspecies of tree that is endemic to south-eastern Australia. It has mostly smooth bark with some persistent slabs of old bark at the base, juvenile leaves with one glaucous side, glossy, lance-shaped adult leaves, warty flower buds in groups of three, white flowers and hemispherical to conical fruit.

<i>Eucalyptus coccifera</i> Species of eucalyptus

Eucalyptus coccifera, commonly known as the Tasmanian snow gum, is a small to medium-sized tree endemic to Tasmania. It has smooth, grey and cream-coloured bark, elliptic to lance-shaped adult leaves, flower buds in groups of between three and nine, usually white flowers and conical, hemispherical or cup-shaped fruit.

<i>Eucalyptus vernicosa</i> Species of eucalyptus

Eucalyptus vernicosa, commonly known as varnished gum, is a species of shrub or a mallee that is endemic to mountainous areas of Tasmania. It has smooth greyish bark, crowded, egg-shaped to elliptical or round leaves, flower buds singly or in groups of three in leaf axils, white flowers and hemispherical or bell-shaped fruit.

<i>Eucalyptus nitida</i> Species of eucalyptus

Eucalyptus nitida, commonly known as the Smithton peppermint, is a species of tree or mallee that is endemic to Tasmania. It has varying amounts of loose, fibrous or flaky bark, lance-shaped to curved adult leaves, flower buds in groups of nine to fifteen, white flowers and cup-shaped to hemispherical fruit.

<i>Eucalyptus tenuiramis</i> Species of eucalyptus

Eucalyptus tenuiramis, commonly known as the silver peppermint, is a species of small to medium-sized tree that is endemic to southeastern Tasmania. It has smooth bark, broadly lance-shaped adult leaves, flower buds in groups of nine to fifteen, white flowers and cup-shaped, hemispherical or conical fruit.

Eucalyptus conspicua, commonly known as Gippsland swamp-box, is a species of small tree that is endemic to southeastern Australia. It has rough, thick, fibrous bark from the trunk to its small branches, lance-shaped to curved adult leaves, flower buds in groups of seven, white flowers and conical or hemispherical fruit. The crown of the tree is composed of a dull bluish-green juvenile, intermediate and adult leaves.

<i>Eucalyptus falciformis</i> Species of plant

Eucalyptus falciformis, commonly known as the Grampians peppermint or western peppermint, is a species of tree or mallee that is endemic to south eastern Australia. It has smooth bark, sometimes with rough, fibrous bark at the base, narrow lance-shaped to egg-shaped or curved adult leaves, flower buds in groups of eleven to twenty one, white flowers and cup-shaped to shortly cylindrical fruit.

<i>Eucalyptus urnigera</i> Species of eucalyptus

Eucalyptus urnigera, commonly known as urn tree, is a species of small to medium-sized tree that is endemic to Tasmania. It has smooth bark, lance-shaped or elliptical leaves, flower buds in groups of three, white flowers and urn-shaped fruit.

<i>Eucalyptus globulus <span style="font-style:normal;">subsp.</span> globulus</i> Subspecies of eucalyptus

Eucalyptus globulus subsp. globulus, commonly known as the Tasmanian blue gum, southern blue gum, or blue gum, is a subspecies of tree that is endemic to southeastern Australia. It has mostly smooth bark with some persistent slabs of old bark at the base, juvenile leaves with one glaucous side, glossy, lance-shaped adult leaves, warty flower buds arranged singly in leaf axils, white flowers and hemispherical to conical fruit that is more or less square in cross-section.

Eucalyptus nebulosa, commonly known as the serpentine peppermint, is a species of small tree that is endemic to the northwest of Tasmania. It has smooth, creamy white bark, narrow elliptic adult leaves, flower buds usually arranged in groups of between seven and eleven, pale creamy white flowers and hemispherical or more or less top-shaped fruit.

Eucalyptus rodwayi, commonly known as the swamp peppermint, is a species of small to medium-sized tree that is endemic to Tasmania. It has rough, fibrous to flaky bark on the trunk and branches, narrow lance-shaped adult leaves, flower buds in groups of between seven and eleven, white flowers and conical to hemispherical fruit.

References

  1. 1 2 "Eucalyptus risdonii". Australian Plant Census. Retrieved 15 December 2019.
  2. 1 2 3 4 5 6 "Eucalyptus risdonii". Euclid:Centre for Australian National Biodiversity Research. Retrieved 29 May 2020.
  3. 1 2 3 4 Chippendale, George M. "Eucalyptus risdonii". Australian Biological Resources Study, Department of the Environment and Energy, Canberra. Retrieved 15 December 2019.
  4. 1 2 3 4 5 6 "Threatened species link Eucalyptus risdonii". Government of Tasmania, Department of Primary Industries, Parks, Water and Environment. Retrieved 15 December 2019.
  5. "Eucalyptus risdonii". APNI. Retrieved 15 December 2019.
  6. Hooker, Joseph Dalton (1847). "Florae Tasmaniae Spicilegium: or, Contributions towards a Flora of Van Diemen's Land". London Journal of Botany. 6: 477. Retrieved 15 December 2019.
  7. "Eucalyptus risdonii". University of Tasmania. Retrieved 15 December 2019.
  8. R. J. E. Wiltshire; J. B. Reid & B. M. Potts (1998). "Genetic Control of Reproductive and Vegetative Phase Change in the Eucalyptus risdonii–E. tenuiramis Complex". Australian Journal of Botany. 46. Australian Journal of Botany hosted at Commonwealth Scientific and Industrial Research Organisation: 45. doi:10.1071/bt97020 . Retrieved 27 March 2010.