Grevillea olivacea

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Grevillea olivacea
Grevillea olivacea Fagg.jpg
In the Australian National Botanic Gardens
Status DECF P4.svg
Priority Four — Rare Taxa (DEC)
Scientific classification Red Pencil Icon.png
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Proteales
Family: Proteaceae
Genus: Grevillea
Species:
G. olivacea
Binomial name
Grevillea olivacea

Grevillea olivacea, commonly known as olive grevillea, [2] is a species of flowering plant in the family Proteaceae and is endemic to the west coast of Western Australia. It is a dense, erect shrub with elliptic to egg-shaped leaves, and erect clusters of bright red and orange or yellow flowers with a red to yellow style.

Contents

Description

Grevillea olivacea is a dense, erect shrub that typically grows to a height of 1–4.5 m (3 ft 3 in – 14 ft 9 in) and has silky-hairy branchlets. Its leaves are elliptic to egg-shaped with the narrower end towards the base, 30–68 mm (1.2–2.7 in) long and 5–17 mm (0.20–0.67 in) wide. The upper surface of the leaves is more or less glabrous and the lower surface is silky-hairy. The flowers are arranged in dense, umbel-like groups of 14 to 28 on a woolly-hairy rachis 4–8 mm (0.16–0.31 in) long. The flowers are bright red and orange or yellow and hairy on the outside, the pistil 22–30 mm (0.87–1.18 in) long with a red to yellow style. Flowering occurs from June to October and the fruit is an oblong to oval follicle 11–15 mm (0.43–0.59 in) long. [3] [4] [2]

Taxonomy

Grevillea olivacea was first formally described by Alex George in the journal Nuytsia from specimens collected on the mainland opposite Snag Island south of Dongara in 1966. [4] [5] The specific epithet (olivacea) refers to the leaf colour, resembling that of the olive ( Olea europea ). [4]

Distribution and habitat

Olive grevillea grows in shrubland on calcareous sand over limestone in near coastal areas of Western Australia between Jurien Bay and Leeman in the Geraldton Sandplains and Swan Coastal Plain bioregions of south-western Western Australia. [3] [2]

Conservation status

This grevillea is listed as "Priority Four" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions, [2] meaning that it is rare or near threatened. [6]

Use in horticulture

Grevillea olivacea is an ornamental but hardy plant, suitable for use in nature strips and parks and as an informal hedge. It grows well in all soil types provided the drainage is good. It responds well to pruning and is attractive to birds and insects. [7] [8]

Related Research Articles

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<i>Grevillea bronweniae</i> Species of shrub in the family Proteaceae endemic to the south-west of Western Australia

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<i>Grevillea celata</i> Species of plant in the family Proteaceae endemic to Victoria, Australia

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<i>Grevillea diversifolia</i> Species of shrub in the family Proteaceae native to Western Australia

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Grevillea hockingsii is a species of flowering plant in the family Proteaceae and is endemic to south-eastern Queensland. It is an erect shrub with oblong to narrowly elliptic leaves and clusters of reddish-pink flowers.

<i>Grevillea evanescens</i> Species of shrub in the family Proteaceae endemic to Western Australia

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<i>Grevillea granulosa</i> Species of shrub in the family Proteaceae endemic to Western Australia

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<i>Grevillea kenneallyi</i> Species of shrub in the family Proteaceae endemic to Western Australia

Grevillea kenneallyi is a species of flowering plant in the family Proteaceae and is endemic to the south-west of Western Australia. It is a dense, spreading shrub with divided leaves, the end lobes more or less linear, and clusters of white flowers.

<i>Grevillea fasciculata</i> Species of shrub in the family Proteaceae endemic to Western Australia

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Grevillea cheilocarpa is a species of flowering plant in the family Proteaceae and is endemic to a restricted area in the south-west of Western Australia. It is a shrub with silky-hairy, egg-shaped leaves with the narrower end towards the base, and yellow flowers.

<i>Grevillea coccinea</i> Species of shrub in the family Proteaceae endemic to Western Australia

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<i>Grevillea deflexa</i> Species of shrub in the family Proteaceae native to Western Australia

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<i>Grevillea extorris</i> Species of shrub in the family Proteaceae endemic to Western Australia

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<i>Grevillea fistulosa</i> Species of shrub in the family Proteaceae endemic to Western Australia

Grevillea fistulosa, commonly known as Barrens grevillea or Mount Barren grevillea, is a species of flowering plant in the family Proteaceae and is endemic to the Fitzgerald River National Park in the south-west of Western Australia. It is an erect shrub with narrowly egg-shaped to broadly linear leaves and clusters of orange-red to scarlet flowers.

Grevillea fuscolutea is a species of flowering plant in the family Proteaceae and is endemic to a small area in the south-west of Western Australia. It is an erect shrub with egg-shaped to more or less linear leaves, and dull yellow-orange flowers.

<i>Grevillea gordoniana</i> Species of tree or shrub in the family Proteaceae endemic to Western Australia

Grevillea gordoniana is a species of flowering plant in the family Proteaceae and is endemic to the west of Western Australia. It is an erect shrub or small tree with cylindrical leaves and yellow to orange flowers.

<i>Grevillea hislopii</i> Species of shrub in the family Proteaceae endemic to Western Australia

Grevillea hislopii is a species of flowering plant in the family Proteaceae and is endemic to a restricted area of the south-west of Western Australia. It is a dense, single-stemmed shrub with linear to narrow elliptic leaves and clusters of hairy, whitish-grey flowers.

Grevillea nivea is a species of flowering plant in the family Proteaceae and is endemic to the south of Western Australia. It is a dense shrub with spreading to ascending branches, crowded, divided leaves, the end lobes linear, and dense clusters of red flowers.

References

  1. "Grevillea olivacea". Australian Plant Census. Retrieved 3 August 2022.
  2. 1 2 3 4 "Grevillea olivacea". FloraBase . Western Australian Government Department of Biodiversity, Conservation and Attractions.
  3. 1 2 "Grevillea olivacea". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 3 August 2022.
  4. 1 2 3 George, Alex S. (1974). "Seven new species of Grevillea (Proteaceae) from Western Australia". Nuytsia. 1 (4): 373. Retrieved 3 August 2022.
  5. "Grevillea olivacea". APNI. Retrieved 3 August 2022.
  6. "Conservation codes for Western Australian Flora and Fauna" (PDF). Government of Western Australia Department of Parks and Wildlife. Retrieved 3 August 2022.
  7. "Olive Grevillea Grevillea olivacea" (PDF). Kings Park and Botanic Gardens. Retrieved 3 August 2022.
  8. "Grevillea olivacea". Botanic Gardens of South Australia. Retrieved 3 August 2022.