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The Douglas squirrel harvests and hoards great quantities of Douglas-fir cones, and also consumes mature pollen cones, the inner bark, terminal shoots, and developing young needles. [13] Mature or "old-growth" Douglas-fir forest is the primary habitat of the red tree vole (Arborimus longicaudus) and the spotted owl (Strix occidentalis).
Fraser fir is monoecious, meaning that both male and female cones occur on the same tree. [11] Cone buds usually open from mid-May to early June. Female cones are borne mostly in the top few feet of the crown and on the distal ends of branches. Male cones are borne below female cones, but mostly in the upper half of the crown.
In contrast to spruces, fir cones are erect; they do not hang, unless heavy enough to twist the branch with their weight. The mature cones are usually brown. When young in summer, they can be green: A. grandis, A. holophylla. or reddish: A. alba, A. cephalonica, A. nordmanniana. or bloomed pale glaucous or pinkish: A. numidica, A. pinsapo
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 .
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Abies amabilis, commonly known as the Pacific silver fir, is a fir native to the Pacific Northwest of North America, occurring in the Pacific Coast Ranges and the Cascade Range. It is also commonly referred to in English as the white fir , red fir , lovely fir , amabilis fir , Cascades fir , or silver fir .
Abies balsamea or balsam fir is a North American fir, native to most of eastern and central Canada (Newfoundland west to central Alberta) and the northeastern United States (Minnesota east to Maine, and south in the Appalachian Mountains to West Virginia).