Eucalyptus diversicolor

taxobox
name = Karri

---

image_caption = Climbing a famous Karri Tree - The Gloucester Tree
regnum = Plantae
unranked_divisio = Angiosperms
unranked_classis = Eudicots
unranked_ordo = Rosids
ordo = Myrtales
familia = Myrtaceae
genus = "Eucalyptus"
species = "E. diversicolor"
binomial = "Eucalyptus diversicolor"
binomial_authority = F.Muell.|

Karri ("Eucalyptus diversicolor") is a eucalypt which is native to the wetter regions of south west of Western Australia.

Description

The tree grows to 90 metres, making it one of the tallest species in the world. It has white to cream bark that changes to brown as it matures and is shed. As the bark is shed the predominantly white trunk takes on a patina of colours from white to grey to deep brown. It is this effect from which the botanic name derives. The trunk extends straight up with no secondary trunks: occasionally a twin trunk occurs where two trunks of the same diameter grow straight up from the seedling stage. In mature trees branches will be present in the top third of the tree only. The leaves are dark green on top and lighter underneath, and grow to a length of 90-120 mm and 20-30 mm broad. The flowers occur in groups of seven, each flower 18-28 mm diameter. Flowers are cream coloured. It flowers in spring and summer, and flowering is stimulated after fire. The fruits are squat barrel-shaped, 7-10 mm long and 10-15 mm broad, containing numerous small dry seeds.

Ecology

The soil in which karri grow is often poor, and the tree tends to flower after fire to take advantage of the nutrients released by the combustion of forest litter. The soil is classified Karri Loam. Though low in some minor nutrients it is admired for its depth and pasture-growing properties. The depth of the soil is several metres and thought to be created primarily from the bark shed by the tree, which collects at the trunk base to a depth upwards of six metres in mature trees. The karri supports an extensive ecosystem which is connected to the granite outcrops of the lower south-west and the many subsequent creeks and rivers created from runoff. Karri generally dominate in the deep valleys between granite outcrops surrounding the creeks and rivers.

Distribution

Karri occurs only within the High Rainfall Zone of the South West Botanical Province of Western Australia. It mostly occurs within the Warren biogeographic region, but there are some outlying populations, of which the most notable is in the Porongorup Ranges.

Uses

Karri wood is a beautiful mahogany color, lighter in color than jarrah. It is used extensively in the building industry, particularly in roofs due to the length and uninterrupted knot-free nature of the trunk. It has the reputation of being termite-prone, although it is nowhere near as susceptible to these insects as pine. It is also a great furniture wood. Karri honey is widely sought after for its light color and delicate flavor. Tourism to this area is also supported by the karri.

ee also

*Gloucester Tree, a famous karri tree in Western Australia that has a platform 61 metres above ground level;
*Warren (biogeographic region), also known as the Karri Forest Region.

External links

* [http://www.nationalgeographic.com/wildworld/profiles/terrestrial/aa/aa1204.html National Geographic]
* [http://www.naturebase.net/content/view/308/97/ Department of Conservation and Environment] - information page.

References

*
* Boland, D. J. "et al." (1984) "Forest Trees of Australia (Fourth edition revised and enlarged)", CSIRO Publishing, Collingwood, Victoria, Australia. ISBN 0-643-05423-5.