Fitzroya

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(Redirected from Alerce)
Fitzroya
Conservation status: Endangered
Scientific classification
Kingdom:Plantae
Division:Pinophyta
Class:Pinopsida
Order:Pinales
Family:Cupressaceae
Genus:Fitzroya
Species:F. cupressoides

Template:Taxobox section binomial botany

Fitzroya is a genus in the cypress family Cupressaceae with only a single species, Fitzroya cupressoides native to the Andes mountains of central Chile and adjoining Argentina, where it is an important member of the Valdivian temperate rain forests. The scientific name of the genus honours Robert FitzRoy; common names include Lahuan (the Mapuche Native American name), Alerce (South American Spanish), and Patagonian Cypress.

It is a very large evergreen tree, the largest tree in South America, growing to 40-60 m tall and at least 5 m trunk diameter. The leaves are in decussate whorls of three, 3-6 mm long (to 8 mm long on seedlings) and 2 mm broad, marked with two white stomatal lines. The cones are globose, 6-8 mm diameter, opening flat to 12 mm across, with nine scales in three whorls of three. Only the central whorl of scales is fertile, bearing 2-3 seeds on each scale; the lower and upper whorls are small and sterile. The seeds are 2-3 mm long, flat, with a wing along each side. The seeds are mature 6-8 months after pollination.

In 1993 a specimen from Chile was dated as 3622 years old. This gives it the second-greatest fully verified age recorded for any living tree (the oldest being the Great Basin Bristlecone Pine). Much larger specimens existed in the past before the species was heavily logged in the 19th and 20th centuries; Charles Darwin reported finding a specimen 12.6 m in diameter, which, if accurately measured, would have made it the stoutest tree ever measured anywhere in the world.

A team of researchers from the University of Tasmania found fossilized foliage of Fitzroya on the Lea River of northwest Tasmania. The 35 million year-old fossil has been given the species name Fitzroya tasmanensis. The finding demonstrates the ancient floristic affinities between Australasia and southern Southern South America, which botanists indentify as the Antarctic flora.

Reference

Hill, R. S. and Whang, S. S. 1996. A new species of Fitzroya (Cupressaceae) from Oligocene sediments in north-western Tasmania. Australian Systematic Botany 9(6): 867-875.

External links

Gymnosperm Database - Fitzroya cupressoides (http://www.botanik.uni-bonn.de/conifers/cu/fi/)

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