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{{Short description|Species of tree}}
{{Use dmy dates|date=July 2019}}
{{Use dmy dates|date=July 2019}}
{{Speciesbox
{{speciesbox
|name = Risdon peppermint
|name = Risdon peppermint
|image = Eucalyptus risdonii.jpg
|image = Eucalyptus risdonii.jpg
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|status_system =
|status_system =
|status =
|status =
|authority = [[Joseph Dalton Hooker|Hook.f]]<ref name="APC">{{cite web |title=''Eucalyptus risdonii'' |url=https://biodiversity.org.au/nsl/services/apc-format/display/102095|website=Australian Plant Census |accessdate=15 December 2019}}</ref>
|authority = [[Joseph Dalton Hooker|Hook.f]]<ref name="APC">{{cite web |title=''Eucalyptus risdonii'' |url=https://biodiversity.org.au/nsl/services/apc-format/display/102095|website=Australian Plant Census |access-date=15 December 2019}}</ref>
|synonyms_ref = <ref name="APC" />
|synonyms_ref = <ref name="APC" />
|synonyms =
|synonyms =
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* ''Eucalyptus risdonii'' <small>Hook.f.</small> var. ''risdonii''
* ''Eucalyptus risdonii'' <small>Hook.f.</small> var. ''risdonii''
}}
}}

⚫
[[File:Eucalyptus risdonii flowers.jpg|thumb|flowers]]
'''''Eucalyptus risdonii''''', commonly known as the '''Risdon peppermint''',<ref name="CANBR">{{cite web |title=''Eucalyptus risdonii'' |url=https://apps.lucidcentral.org/euclid/text/entities/eucalyptus_risdonii.htm |publisher=Euclid:Centre for Australian National Biodiversity Research |accessdate=29 May 2020}}</ref> is species of small tree that is [[Endemism|endemic]] to a small area in southern Tasmania. It has smooth bark, a [[Crown (botany)|crown]] composed mostly of [[Sessility (botany)|sessile]], [[wikt:glaucous#Adjective|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.
'''''Eucalyptus risdonii''''', commonly known as the '''Risdon peppermint''',<ref name="CANBR">{{cite web |title=''Eucalyptus risdonii'' |url=https://apps.lucidcentral.org/euclid/text/entities/eucalyptus_risdonii.htm |publisher=Euclid:Centre for Australian National Biodiversity Research |access-date=29 May 2020}}</ref> is a species of small tree that is [[Endemism|endemic]] to a small area in southern Tasmania. It has smooth bark, a [[Crown (botany)|crown]] composed mostly of [[Sessility (botany)|sessile]], [[wikt:glaucous#Adjective|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==
==Description==
⚫
[[File:Eucalyptus risdonii flowers.jpg|thumb|Flowers]]
⚫
''Eucalyptus risdonii'' is a tree that typically grows to a height of {{cvt|8|m}} and forms a [[lignotuber]]. 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, {{cvt|20-50|mm}} long and wide. The crown is composed mostly of juvenile leaves. Adult leaves, when formed, are arranged alternately, dull green, lance-shaped, up to {{cvt|100|mm}} long and {{cvt|20|mm}} wide. The flower buds are arranged in leaf [[wikt:axil|axil]]s, on an unbranched [[Peduncle (botany)|peduncle]] {{cvt|5-25|mm}} long, the individual buds on [[Pedicel (botany)|pedicels]] {{cvt|2-5|mm}} long. Mature buds are oval to club-shaped, {{cvt|4-7|mm}} long and {{cvt|3-5|mm}} wide with a rounded to flattened [[Operculum (botany)|operculum]]. Flowering occurs from November to January and the flowers are white. The fruit is a woody cup-shaped, conical or hemispherical [[Capsule (botany)|capsule]] {{cvt|6-10|mm}} long and {{cvt|6-9|mm}} wide with the valves below rim level.<ref name="CANBR" /><ref name="ABRS">{{cite web |last1=Chippendale |first1=George M. |title=''Eucalyptus risdonii'' |url=https://profiles.ala.org.au/opus/foa/profile/Eucalyptus%20risdonii |publisher=Australian Biological Resources Study, Department of the Environment and Energy, Canberra |accessdate=15 December 2019}}</ref><ref name="dpipwe">{{cite web |title=Threatened species link ''Eucalyptus risdonii'' |url=https://www.naturalvaluesatlas.tas.gov.au/downloadattachment?id=13919 |publisher=Government of Tasmania, Department of Primary Industries, Parks, Water and Environment |accessdate=15 December 2019}}</ref>
''Eucalyptus risdonii'' is a tree that typically grows to a height of {{cvt|8|m}} and forms a [[lignotuber]].<ref name="CANBR" /><ref name="ABRS">{{cite web |last1=Chippendale |first1=George M. |title=''Eucalyptus risdonii'' |url=https://profiles.ala.org.au/opus/foa/profile/Eucalyptus%20risdonii |publisher=Australian Biological Resources Study, Department of the Environment and Energy, Canberra |access-date=15 December 2019}}</ref><ref name="dpipwe">{{cite web |title=Threatened species link ''Eucalyptus risdonii'' |url=https://www.naturalvaluesatlas.tas.gov.au/downloadattachment?id=13919 |publisher=Government of Tasmania, Department of Primary Industries, Parks, Water and Environment |access-date=15 December 2019}}</ref>

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, {{cvt|20-50|mm}} long and wide. The crown is composed mostly of juvenile leaves. Adult leaves, when formed, are arranged alternately, dull green, lance-shaped, up to {{cvt|100|mm}} long and {{cvt|20|mm}} wide.<ref name="CANBR" /><ref name="ABRS">{{cite web |last1=Chippendale |first1=George M. |title=''Eucalyptus risdonii'' |url=https://profiles.ala.org.au/opus/foa/profile/Eucalyptus%20risdonii |publisher=Australian Biological Resources Study, Department of the Environment and Energy, Canberra |access-date=15 December 2019}}</ref><ref name="dpipwe">{{cite web |title=Threatened species link ''Eucalyptus risdonii'' |url=https://www.naturalvaluesatlas.tas.gov.au/downloadattachment?id=13919 |publisher=Government of Tasmania, Department of Primary Industries, Parks, Water and Environment |access-date=15 December 2019}}</ref>

⚫
The flower buds are arranged in leaf [[wikt:axil|axil]]s, on an unbranched [[Peduncle (botany)|peduncle]] {{cvt|5-25|mm}} long, the individual buds on [[Pedicel (botany)|pedicels]] {{cvt|2-5|mm}} long. Mature buds are oval to club-shaped, {{cvt|4-7|mm}} long and {{cvt|3-5|mm}} wide with a rounded to flattened [[Operculum (botany)|operculum]]. Flowering occurs from November to January and the flowers are white.<ref name="CANBR" /><ref name="ABRS">{{cite web |last1=Chippendale |first1=George M. |title=''Eucalyptus risdonii'' |url=https://profiles.ala.org.au/opus/foa/profile/Eucalyptus%20risdonii |publisher=Australian Biological Resources Study, Department of the Environment and Energy, Canberra |access-date=15 December 2019}}</ref><ref name="dpipwe">{{cite web |title=Threatened species link ''Eucalyptus risdonii'' |url=https://www.naturalvaluesatlas.tas.gov.au/downloadattachment?id=13919 |publisher=Government of Tasmania, Department of Primary Industries, Parks, Water and Environment |access-date=15 December 2019}}</ref>

The fruit is a woody cup-shaped, conical or hemispherical [[Capsule (botany)|capsule]] {{cvt|6-10|mm}} long and {{cvt|6-9|mm}} wide with the valves below rim level.<ref name="CANBR" /><ref name="ABRS">{{cite web |last1=Chippendale |first1=George M. |title=''Eucalyptus risdonii'' |url=https://profiles.ala.org.au/opus/foa/profile/Eucalyptus%20risdonii |publisher=Australian Biological Resources Study, Department of the Environment and Energy, Canberra |access-date=15 December 2019}}</ref><ref name="dpipwe">{{cite web |title=Threatened species link ''Eucalyptus risdonii'' |url=https://www.naturalvaluesatlas.tas.gov.au/downloadattachment?id=13919 |publisher=Government of Tasmania, Department of Primary Industries, Parks, Water and Environment |access-date=15 December 2019}}</ref>


==Taxonomy and naming==
==Taxonomy and naming==
''Eucalyptus risdonii'' was first formally described in 1847 by [[Joseph Dalton Hooker]] in the ''London Journal of Botany''.<ref name=APNI>{{cite web|title=''Eucalyptus risdonii''|url= https://id.biodiversity.org.au/instance/apni/455714|publisher=APNI|accessdate=15 December 2019}}</ref><ref name="Hook.f.">{{cite journal |last1=Hooker |first1=Joseph Dalton |title=Florae Tasmaniae Spicilegium: or, Contributions towards a Flora of Van Diemen's Land |journal=London Journal of Botany |date=1847 |volume=6 |page=477 |url=https://www.biodiversitylibrary.org/item/6317#page/519/mode/1up |accessdate=15 December 2019}}</ref> The [[Botanical name|specific epithet]] (''risdonii'') refers to the locality [[Risdon, Tasmania|Risdon]], where the [[Type (biology)|type]] specimen was found.<ref name="CANBR" />
''Eucalyptus risdonii'' was first formally described in 1847 by [[Joseph Dalton Hooker]] in the ''London Journal of Botany''.<ref name=APNI>{{cite web|title=''Eucalyptus risdonii''|url= https://id.biodiversity.org.au/instance/apni/455714|publisher=APNI|access-date=15 December 2019}}</ref><ref name="Hook.f.">{{cite journal |last1=Hooker |first1=Joseph Dalton |title=Florae Tasmaniae Spicilegium: or, Contributions towards a Flora of Van Diemen's Land |journal=London Journal of Botany |date=1847 |volume=6 |page=477 |url=https://www.biodiversitylibrary.org/item/6317#page/519/mode/1up |access-date=15 December 2019}}</ref> The [[Botanical name|specific epithet]] (''risdonii'') refers to the locality [[Risdon, Tasmania|Risdon]], where the [[Type (biology)|type]] specimen was found.<ref name="CANBR" />


==Distribution and habitat==
==Distribution and habitat==
The Risdon peppermint is only known from the dry slopes on the eastern side of the [[River Derwent (Tasmania)|River Derwent]] near Risdon and Grass Tree Hill. It grows in low, open forest on sunny, north-west facing ridges.<ref name="dpipwe" /><ref name="utas">{{cite web |title=''Eucalyptus risdonii'' |url=https://www.utas.edu.au/dicotkey/dicotkey/MYRTS/sEucalyptus_risdonii.htm |publisher=University of Tasmania |accessdate=15 December 2019}}</ref>
The Risdon peppermint is only known from the dry slopes on the eastern side of the [[River Derwent (Tasmania)|River Derwent]] near Risdon and Grass Tree Hill. It grows in low, open forest on sunny, north-west facing ridges.<ref name="dpipwe" /><ref name="utas">{{cite web |title=''Eucalyptus risdonii'' |url=https://www.utas.edu.au/dicotkey/dicotkey/MYRTS/sEucalyptus_risdonii.htm |publisher=University of Tasmania |access-date=15 December 2019}}</ref>


This species is reported to be a [[neoteny|juvenilised]] form of its [[sister species]], ''[[Eucalyptus tenuiramis|E. tenuiramis]]''.<ref name="CSIRO_AJB_1998_WiltshireReidPotts_Abstract_ERisdonii">{{cite web|url=http://www.publish.csiro.au/paper/BT97020|title=Genetic Control of Reproductive and Vegetative Phase Change in the Eucalyptus risdonii–E. tenuiramis Complex|author= R. J. E. Wiltshire|author2= J. B. Reid|author3= B. M. Potts|last-author-amp= yes|year=1998|publisher=[[Australian Journal of Botany]] hosted at [[Commonwealth Scientific and Industrial Research Organisation]]|accessdate=27 March 2010}}</ref>
This species is reported to be a [[neoteny|juvenilised]] form of its [[sister species]], ''[[Eucalyptus tenuiramis|E. tenuiramis]]''.<ref name="CSIRO_AJB_1998_WiltshireReidPotts_Abstract_ERisdonii">{{cite journal|url=http://www.publish.csiro.au/paper/BT97020|title=Genetic Control of Reproductive and Vegetative Phase Change in the Eucalyptus risdonii–E. tenuiramis Complex|author= R. J. E. Wiltshire|author2= J. B. Reid|author3= B. M. Potts|journal=Australian Journal of Botany |name-list-style= amp|year=1998|volume=46 |page=45 |publisher=[[Australian Journal of Botany]] hosted at [[Commonwealth Scientific and Industrial Research Organisation]]|doi=10.1071/bt97020 |access-date=27 March 2010}}</ref>


==Conservation status==
==Conservation status==
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{{DEFAULTSORT:Eucalyptus Risdonii}}
{{DEFAULTSORT:Eucalyptus Risdonii}}
[[Category:Flora of Tasmania]]
[[Category:Endemic flora of Tasmania]]
[[Category:Endemic flora of Tasmania]]
[[Category:Myrtales of Australia]]
[[Category:Myrtales of Australia]]

Latest revision as of 22:26, 23 April 2024

Risdon peppermint
Eucalyptus risdonii in the ANBG
Scientific classification Edit this classification
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 risdoni Hook.f. orth. var.
  • Eucalyptus risdonii Hook.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[edit]

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[edit]

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[edit]

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[edit]

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

References[edit]

  1. ^ a b "Eucalyptus risdonii". Australian Plant Census. Retrieved 15 December 2019.
  2. ^ a b c d e f "Eucalyptus risdonii". Euclid:Centre for Australian National Biodiversity Research. Retrieved 29 May 2020.
  3. ^ a b c d Chippendale, George M. "Eucalyptus risdonii". Australian Biological Resources Study, Department of the Environment and Energy, Canberra. Retrieved 15 December 2019.
  4. ^ a b c d e f "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.

External links[edit]

Wikimedia Commons has media related to Eucalyptus risdonii.
Retrieved from "https://en.wikipedia.org/w/index.php?title=Eucalyptus_risdonii&oldid=1220460977"