The Douglas fir (Pseudotsuga menziesii) is an evergreen conifer species in the pine family, Pinaceae, which is native to western North America. The trees grow to a height of around 20 to 100 metres (70 to 330 feet) and commonly reach 2.4 metres (8 feet) in diameter. The largest coast Douglas firs regularly live for more than 500 years, with the oldest specimens more than 1,300 years old. The cones are pendulous and differ from true firs as they have persistent scales. The cones have distinctive long, trifid (three-pointed) bracts, which protrude prominently above each scale. The cones become tan when mature, measuring 6 to 10 centimetres (2+1⁄2 to 4 inches) long for coastal Douglas firs. This photograph shows a young female cone of the variety Pseudotsuga menziesii var. glauca (Rocky Mountain Douglas-fir), cultivated near Keila, Estonia.Photograph credit: Ivar Leidus
The CategoryTree is a MediaWiki extension that provides a dynamic view: you can change how much you see of a category's structure as a tree. You can use it to show a category and its subcategories by putting the category name between category tree tags like this:
<categorytree>
Trees in religion
</categorytree>
The result is a category tree like the one shown to the right. Click on the triangles to expand and collapse the tree.
