Araucaria

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Araucaria
Missing image
Araucaria.columnaris1web.jpg



Araucaria columnaris
Scientific classification
Kingdom:Plantae
Division:Pinophyta
Class:Pinopsida
Order:Pinales
Family:Araucariaceae
Genus:Araucaria
Juss., {{{date}}}
Species

See text

Araucaria is a genus of coniferous trees in the family Araucariaceae. There are 19 species in the genus, with a highly disjunct distribution in New Caledonia (where 13 species are endemic), Norfolk Island, eastern Australia, New Guinea, Argentina, Chile, and southern Brazil. Many if not all current populations are relictual and restricted. They are found in forest and maquis, with an affinity for exposed sites. These columnar trees are living fossils, dating back to early in the dinosaur age. Fossil records show that the genus also formerly occurred in the northern hemisphere until the end of the Cretaceous period.

The genus is familiar to many people as the genus of the distinctive Monkey-puzzle Araucaria araucana. The genus is named after the Arauco Indians of central Chile whose territory incorporates natural stands of this species, where it is known as the Pehuén. These Native Americans, who name themselves the Pehuenche ('people of the Pehuén'), harvest the seeds extensively for food. No distinct vernacular name exists for the genus; many are erroneously called 'pine', despite their being only very distantly related to pines (Pinus).

Araucaria columnaris branch
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Araucaria columnaris branch

They are mainly large trees with a massive erect stem, reaching a height of 30-80 m. The horizontal, spreading branches grow in whorls and are covered with leathery or needle-like leaves. In some species, the leaves are narrow awl-shaped and lanceolate, barely overlapping each other, in others they are broad and flat, and overlap broadly. The trees are mostly dioecious, with male and female cones found on separate trees, though occasional individuals are monoecious or change sex with time. The female cones, usually high on the top of the tree, are globose, and vary in size between species from 7-25 cm diameter. They contain 80-200 large, edible seeds, similar to pine nuts though larger. The male cones are smaller, 4-10 cm long, and narrow to broad cylindrical, 1.5-5 cm broad.

Classification & species list

There are two sections in the genus, sometimes treated as separate genera:

  • Section Araucaria. Leaves broad; cones more than 12cm diameter; seed germination hypogeal.
  • Section Eutacta. Leaves narrow, awl-like; cones less than 12cm diameter; seed germination epigeal.
Missing image
NorfolkIslandPineKerikeri.jpg
Araucaria heterophylla as an exotic ornamental tree in New Zealand.

Uses

Some of the species are relatively common in cultivation because of their distinctive, formal symmetrical growth habit. Several species are economically important for timber production and the edible seeds.

External link

Gymnosperm Database: Araucaria (http://www.botanik.uni-bonn.de/conifers/ar/ar/index.html)


Araucaria is the pseudonym used by the cryptic crossword compiler John Graham (compiler).

da:Abeskrækslægten (Araucaria) fr:Araucaria it:Araucaria pt:Araucaria

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