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A list of tree species, grouped generally by biogeographic realm and specifically by bioregions, and shade tolerance. Shade-tolerant species are species that are able to thrive in the shade, and in the presence of natural competition by other plants. Shade-intolerant species require full sunlight and little or no competition.
Pseudotsuga menziesii var. glauca, or Rocky Mountain Douglas-fir, is an evergreen conifer native to the interior mountainous regions of western North America, from central British Columbia and southwest Alberta in Canada southward through the United States to the far north of Mexico. [2] The range is continuous in the northern Rocky Mountains ...
Description. Douglas-firs are medium-size to extremely large evergreen trees, 20–100 metres (70–330 feet) tall (although only Pseudotsuga menziesii var. menziesii, common name coast Douglas-firs, reach heights near 100 m) [ 10 ] and commonly reach 2.4 m (8 ft) in diameter, [ 11 ] although trees with diameters of almost 5 metres (16 feet ...
Tsuga heterophylla, the western hemlock[2]or western hemlock-spruce,[3]is a species of hemlocknative to the west coast of North America, with its northwestern limit on the Kenai Peninsula, Alaska, and its southeastern limit in northern Sonoma County, California. [4][5]The Latinspecies name means 'variable leaves'. [6]
Description. [edit] The bottom (left) and top (right) of the foliage. Abies grandis is a large evergreen conifer growing to 40–70 metres (130–230 feet) tall, exceptionally 100 m (330 ft), with a trunk diameter of up to 2 m (6+1⁄2 ft). The dead tree tops sometimes fork into new growth. [ 4 ]
Abies concolor, the white fir, concolor fir, or Colorado fir, is a coniferous tree in the pine family Pinaceae.This tree is native to the mountains of western North America, including the Sierra Nevada and southern Rocky Mountains, and into the isolated mountain ranges of southern Arizona, New Mexico, and Northern Mexico.
Tsuga mertensiana is a large evergreen conifer growing up to 20 to 40 metres (66 to 131 feet) tall, with exceptional specimens as tall as 59 m (194 ft) tall. They have a trunk diameter of up to 2 m (6+1⁄2 ft). The bark is about 3 centimetres (1+1⁄4 inches) thick and square-cracked or furrowed, and purplish-brown [ 3 ] to gray in color.
Below the canopy is the three-layered, shade-tolerant understory that is roughly 9 to 15 m (30 to 50 ft) shorter than the canopy. The top layer of the understory is the sub-canopy composed of smaller mature trees, saplings , and suppressed juvenile canopy layer trees awaiting an opening in the canopy.
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