Monday, April 27, 2009

Grevillea robusta

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Grevillea robusta
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Eudicots
Order:
Proteales
Family:
Proteaceae
Genus:
Grevillea
Species:
G. robusta
Binomial name
Grevillea robustaA.Cunn. ex R.Br.

Leaves and flowers
Grevillea robusta, commonly known as the southern silky oak or Silky-oak, or Australian Silver-oak, is the largest species in the genus Grevillea. It is a native of eastern coastal Australia, in riverine, subtropical and dry rainforest environments receiving more than 1,000 mm per year of average rainfall. It is a fast growing evergreen tree, between 18-35 m tall with dark green delicately dented bipinnatifid leaves reminiscent of a fern frond. It is the largest plant in the Grevillea genus, reaching diameters in excess of one metre. These leaves are generally 15-30cm long with greyish white or rusty undersides. Its flowers are golden-orange bottlebrush-like blooms, between 8-15cm long, in the spring, on a 2-3cm long stem and are used for honey production. The seeds mature in late winter to early spring, fruiting on dark brown leathery dehiscent follicles, about 2cm long, with one or two flat, winged seeds.
Contents
1 Uses
2 Cultivation
3 References
4 External links
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Uses
Before the advent of aluminium, the timber from this tree was widely used for external window joinery as it is resistant to rotting. It was also popular for making furniture. There are severe restrictions on the harvesting of this tree now as the number of trees became depleted. Silky Oak is a valuable timber and was one of Australia best known cabinet timbers.
It is the best tree which can be used for fencing and it is one of the fastest growing trees.
Cultivation
When young it can be grown as a houseplant where it can tolerate light shade, but prefers full sun as it grows best in warm zones. If planted outside, young trees need protection on frosty nights. Once established it is hardier and tolerates temperatures down to about ?8 (17 )[1]. It needs occasional water but is otherwise fairly drought-resistant.
Grevillea robusta is often used as stock for grafting difficult-to-grow grevilleas.
Care needs to be taken when planted near bushland as it can be weedy.
Grevillea robusta (Southern Silky Oak) is also grown in plantations in South Africa.[2]

Silver Oak planted in a tea garden
Trunk bark
Leaf
Flowering branches
Flowers
Unripe seed pods
Leaves and dry seed pods
Dry seed pod
Seed pod and seeds
References
^ "Garden Guides: Silkoak". http://www.gardenguides.com/plants/plant.asp?symbol=GRRO.
^ Overseas-grown Australian Timber Species Retrieved on 8 December 2008
External links
Wikimedia Commons has media related to: Grevillea robusta
Grevillea robusta fact sheet on Forest, Farm, and Community Tree Network (FACT Net)
Germplasm Resources Information Network: Grevillea robusta
Plants of Hawaii (images): Grevillea robusta
This Proteaceae-related article is a stub. You can help Wikipedia by expanding it.
This tree-related article is a stub. You can help Wikipedia by expanding it.
This Australian eudicot article is a stub. Please help Wikipedia grow by expanding it.
Categories: Invasive plant species | Grevillea | Trees of Australia | Proteales of Australia | Plants and pollinators | Drought tolerant trees | Ornamental trees | Wood | Flora of New South Wales | Flora of Queensland | Naturalized trees of Hawaii | Proteaceae stubs | Tree stubs | Australian eudicot stubs(and so on)

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