Pseudotsuga

Definitions

  • WordNet 3.6
    • n Pseudotsuga douglas fir; closely related to genera Larix and Cathaya
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Century Dictionary and Cyclopedia
    • n pseudotsuga A genus of coniferous trees of the tribe Abietineæ. By Eichler, Bugler, and others it is united with the related genus Tsuga, the hemlock-spruce, from which it has been distinguished by the absence of resin-vesicles in the seeds, by the smooth branchlets, and by cones fringed with conspicuous sharply two-lobed bracts much longer than the scales, with their midribs prolonged into a spine or bristle. There is but one species, P. Douglasii, discovered by the Scotch botanist David Douglas, in Oregon, in 1825, the most widely distributed timber-tree of the Pacific States, known as red or yellow fir, Oregon pine, Douglas fir, Douglas spruce, and Douglas pine. (See Oregon pine, under pine.) The wood is unlike that of any related conifer in its abundance of spirally marked wood-cells. The trees are at first pyramidal and spruce-like, afterward more spreading, with very thick and rough brown bark. They bear flat and very narrow linear leaves, spirally inserted, but spreading somewhat in two ranks by a twist at the base, and handsome pendulous cones, which are nearly cylindrical, 2 or 3 inches long, and are matured the first year. In the variety macrocarpa, the hemlock of the San Bernardino Mountains, a smaller tree, about 50 feet in height, the cones reach 7 inches long, and the larger seeds contain as many as from nine to twelve seed-leaves.
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Usage

In literature:

The species forming the bulk of the woods here is the Douglas spruce (Pseudotsuga douglasii), one of the greatest of the western giants.
"Travels in Alaska" by John Muir
But the combination of smooth tracheids with small pits (subsection Paracembra) Pinus shares with Picea, Larix and Pseudotsuga.
"The Genus Pinus" by George Russell Shaw
DOUGLAS FIR (PSEUDOTSUGA TAXIFOLIA).
"The Forests of Mount Rainier National Park" by Grenville F. Allen
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In science:

Pielou (1961) used a completely mapped data set that is comprised of two tree species: Douglas-fir trees (Pseudotsuga menziesii formerly P. taxifolia ) and ponderosa pine (Pinus ponderosa ) from a region in British Columbia.
Overall and Pairwise Segregation Tests Based on Nearest Neighbor Contingency Tables
Pielou used a completely mapped data set that is comprised of ponderosa pine (Pinus Ponderosa ) and Douglas-fir trees (Pseudotsuga menziesii formerly P. taxifolia ) from a region in British Columbia (Pielou (1961)).
New Tests of Spatial Segregation Based on Nearest Neighbor Contingency Tables
Pielou used a completely mapped data that is comprised of ponderosa pine (Pinus ponderosa ) and Douglas-fir trees (Pseudotsuga menziesii formerly P. taxifolia ) from a region in British Columbia (Pielou (1961)).
Directional Clustering Tests Based on Nearest Neighbor Contingency Tables
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