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Abies grandis

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The grand fir, known scientifically as *Abies grandis*, is a massive evergreen conifer native to northwestern North America.

Abies grandis oldtrees
Abies grandis oldtrees

It is a major part of the Grand Fir/Douglas Fir Ecoregion within the Cascade Range. This tree is exceptionally tall and may be the tallest species in the *Abies* genus. It can grow at various altitudes, ranging from sea level up to high mountain elevations. Because it grows in many different areas, it has many common names. People often call it the giant fir, the lowland white fir, or the western white fir.

The tree has a very specific physical structure.

Abies grandis cross section
Abies grandis cross section

Its trunk can reach a diameter of up to 1.5 meters. The bark is thick and ranges in color from reddish to gray, though the inside is purple. This bark is furrowed and divided into slender plates. The leaves are needle-like and flattened. They are glossy dark green on the upper surface. On the bottom, they feature two prominent green-white bands of stomata. Stomata are tiny openings that help the tree with gas exchange. The leaves are arranged in a spiral, but they twist at the base to lie in flat ranks.

There are two distinct varieties of the grand fir. The first is the coast grand fir, or *Abies grandis* var. *grandis*.

Abies grandis cones
Abies grandis cones

This variety lives in coastal lowland forests from Vancouver Island down to Sonoma County, California. These trees are very large and grow very fast. They can reach heights of 70 meters. They also have narrower cones with flexible scales. The second variety is the interior grand fir, or *Abies grandis* var. *idahoensis*. This variety grows in the mountains of Washington, Idaho, Montana, and Oregon. These trees are smaller, reaching only 40 to 45 meters. They grow more slowly than their coastal cousins. Their cones are stouter and have thicker, woody scales.

Reproduction in the grand fir involves specialized cones.

Abies grandis cones
Abies grandis cones

The cones are long and broad, containing between 100 and 150 scales. The scale bracts are short and remain hidden while the cone is closed. After pollination, the cones take about six months to mature. When they reach maturity, the cones disintegrate. This process releases winged seeds into the environment. This method allows the seeds to spread away from the parent tree.

History shows us how we learned about this species. David Douglas, a Scottish botanical explorer, first described the tree. In 1830, he brought seeds back to Britain. He officially described specimens he collected along the Columbia River in 1831. This discovery helped scientists understand the biodiversity of the Pacific Northwest. The tree is also closely related to the white fir, or *Abies concolor*. In some areas, like central Oregon, the two species actually intergrade. This means they blend together in appearance and genetics.

Abies grandis cross section
Abies grandis cross section

The grand fir plays a significant role in the economy and ecology. In the logging industry, its lumber is often called "hem fir." This is a term used for several different species of wood. Grand fir is a softwood, which means it is less dense than hardwoods. It is widely used for making paper and packing crates. It is also used for construction framing and flooring. Builders prefer it because it resists splitting and splintering. It is nearly as strong as the Douglas fir-larch combination. This makes it suitable for heavy construction projects.

Ecologically, the grand fir faces several challenges. The tree lacks the ability to use pitch to patch wounds. This makes it vulnerable to rot fungi and small fires. In the eastern Cascades, western spruce budworm epidemics have killed large populations.

Abies grandis oldtrees
Abies grandis oldtrees

Some trees may live for nearly 300 years. However, in modern stressed conditions, 100 years is more common. Animals like the pileated woodpecker use the trees for nesting. Even rotten cores provide important shelter for animals like black bears. Native American tribes also used the tree for many purposes. They used the bark and pitch for medicine and made canoes from it.

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File:Abies grandis cones.jpg
Abies grandis cones.jpg
File:Abies grandis oldtrees.jpg
Abies grandis oldtrees.jpg
File:Abies grandis cross section.JPG
Abies grandis cross section.JPG
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