Английская Википедия:Eucalyptus caesia
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Eucalyptus caesia, commonly known as caesia[1] or gungurru,[2] is a species of mallee that is endemic to the south-west of Western Australia. It has smooth reddish brown bark at first, later shedding in curling flakes, lance-shaped, sometimes curved adult leaves, club-shaped flower buds covered with a waxy, bluish white bloom, pink stamens with yellow anthers and urn-shaped fruit.
Description
Eucalyptus caesia is a mallee that typically grows to a height of Шаблон:Convert and forms a lignotuber. The bark is smooth reddish brown at first and is shed in curling longitudinal flakes known as "minnirichi". Young branches are shiny red, covered with a waxy, bluish white bloom. Young plants and coppice regrowth have thick, glossy green, heart-shaped leaves Шаблон:Convert long and Шаблон:Convert wide that have a petiole. Adult leaves are lance-shaped to curved, mostly Шаблон:Convert long and Шаблон:Convert wide on a petiole Шаблон:Convert long. The flower buds are arranged in leaf axils in groups of three on an unbranched peduncle Шаблон:Convert long, the individual flowers on pedicels Шаблон:Convert long. Mature flower buds are oval or pear-shaped, covered with a whitish waxy bloom, Шаблон:Convert long and Шаблон:Convert wide with a conical operculum. Flowering mainly occurs between May and September and the flowers have pink stamens with yellow anthers on the tip. The fruit is a woody bell-shaped or urn-shaped capsule Шаблон:Convert long and Шаблон:Convert wide on a peduncle Шаблон:Convert long.[3][4][5]
Taxonomy and naming
Eucalyptus caesia was first formally described in 1867 by George Bentham from a collection made by James Drummond in 1847 and the description was published in Flora Australiensis.[6][7]
In 1982, Ian Brooker and Stephen Hopper described two subspecies, but the Australian Plant Census accepts these as synonyms:
- Eucalyptus caesia subsp. caesia grows to a height of Шаблон:Convert with smaller leaves, buds and fruit than the other subspecies;[3][5][8]
- Eucalyptus caesia subsp. magna grows to a height of Шаблон:Convert with pendulous branches and larger leaves, buds and fruit.[3][5][9]
The specific epithet (caesia) is a Latin word meaning "bluish grey"[10] referring to the waxy cover of the small branches, flower buds and fruit.[3]
Distribution and habitat
Caesia grows in crevices at the base of granite outcrops in scattered inland areas of the south-west, including in the Avon Wheatbelt and Mallee biogeographic regions.[1] The species is known to be drought tolerant.[11]
Ecology
Despite persisting as very small populations, this species does not seem to exhibit effects of inbreeding depression.[12] Associated species include Eucalyptus crucis, Eucalyptus loxophleba, Allocasuarina huegeliana and Acacia lasiocalyx.[13]
Use in horticulture
A form known as 'Silver Princess' is described as a "graceful weeping tree" that has an irregular and weeping form.[14]
Propagation is from seed, which germinates readily.[5]
See also
References
External links
- Eucalyptus caesia Association of Societies for Growing Australian Plants (ASGAP)
- Illustration by Morag Newman
- Illustration by Helen Fitzgerald
- Английская Википедия
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- Trees of Australia
- Eucalypts of Western Australia
- Myrtales of Australia
- Eucalyptus
- Plants described in 1867
- Mallees (habit)
- Taxa named by George Bentham
- Endemic flora of Southwest Australia
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