This is a blog about the native conifers of the Pacific Northwest. It is a companion to the Northwest Conifers site. The blog will focus on timely and interesting details about our conifers, their connections to the rest of the environment, and our connection to them.

Monday, May 25, 2020

Focus on Mountain Hemlock


“My God. It’s full of stars.” This is what Dave Bowman exclaimed when he looked into the monolith orbiting Jupiter in the classic science fiction movie 2001: A Space Odyssey. If he had looked at a mountain hemlock, he might have said the same thing. The needles at the tips of the twigs often look like tiny stars with bright blue-white beams of needles radiating out from a point. The needles of other hemlocks tend to lie flat and have white stomatal bands only on the lower surface.

With complete disregard to any sense of order, the needles of mountain hemlock point in all directions. The needles are short like Western Hemlock, but they have white stomatal bands on both sides of the needle, often giving it a bluish color. The leader at the top of the tree curves and droops over like Western Hemlock. The cones of mountain hemlock are also distinctive. They are about two inches long, three times the size of other hemlocks. In fact, mountain hemlock is so different from other hemlocks that some botanists once thought that it was a hybrid between hemlock and spruce.

Tsuga Mertensiana is the scientific name of mountain hemlock. Tsuga is the Japanese name for hemlock.  The species name, mertensiana, comes from Karl H. Mertens, a German botanist, who first collected specimens in southeast Alaska while on a Russian expedition in 1827.

Mountain Hemlock grows in the higher elevations of the Cascades and Olympic Mountains, often at the timberline with subalpine fir and whitebark pine. Below the timberline, it sometimes grows in pure stands of large trees. However, at the timberline, it often remains a dwarf, creeping shrub, where winter snow flattens it to the ground. In these park-like settings, the hemlocks also grow in clumps, which contain one or more old, large trees and several young trees. The range of mountain hemlock extends into the High Sierras of California, where it grows at higher elevations, the northern Rocky Mountains, and along the coast of Alaska to Anchorage, where it grows down to sea level.

Mountain hemlock at Gnarl Ridge

As you gain elevation when hiking in the mountains of Oregon, you will see mountain hemlocks growing among the western hemlocks, starting at about 3500 feet elevation. By the time you reach 4500 feet, the western hemlocks give way to mountain hemlocks. However, you don’t have to drive up to the mountains to find mountain hemlocks. You can see them planted as ornamentals in urban areas. Look for the bluish color and the drooping top. They thrive even at lower elevations, but grow slowly, which makes them a fitting landscaping tree.

Mountain hemlock has little value as lumber. However, it is an important factor in watershed protection, a fact not lost on people in Portland, which gets its water from Bull Run Lake near Mt. Hood. The water from Bull Run is renowned for its purity, thanks to the mountain hemlock and other trees in the forest above the lake. We can also appreciate the scenic beauty of mountain hemlocks growing in and around grassy alpine meadows. You can see them at Paradise on the south slope of Mount Rainier, at Elk Meadows east of Mount Hood, in Jefferson Park on the north side of Mount Jefferson, and in the Three Sisters Wilderness.

John Muir was impressed by the contrast between its delicate appearance and its ability to thrive in the harshest conditions, spending the long, cold winter at the timberline under many feet of snow. “No other of our alpine conifers so finely veils its strength. Its delicate branches yield to the mountains' gentlest breath; yet is it strong to meet the wildest onsets of the gale,—strong not in resistance, but compliance, bowing, snow-laden, to the ground, gracefully accepting burial month after month in the darkness beneath the heavy mantle of winter…. Thus warmly wrapped they await the summer resurrection. (The Mountains of California, Ch 8 “The Forests”) Curiously some observers have noted that mountain hemlocks may need the protection of all this snow. The roots may freeze in cold environments where there is little snowfall. Heavy snowfall can insulate these delicate roots. John Muir called the mountain hemlock “... ineffably beautiful, the very loveliest of all the American conifers.” (The Yosemite, Ch. 6) Mountain hemlock is one of my favorites, too. Look for them the next time you’re up in the mountains or shopping at a local nursery.

See also
Focus on Westerm Hemlock

More info on mountain hemlock
Gymnosperm Database
Wikiipedia

Thursday, May 21, 2020

Focus on Hemlocks

Hemlock trees are not the source of the poison hemlock that killed Socrates. They are not poisonous and not even related to poison hemlock, but the foliage looks similar, and crushed needles have a similar smell. This, no doubt, led European settlers of North America to call these trees hemlocks. The scientific name of the hemlock genus is Tsuga, which also has a curious origin. Rather than the usual Latin name, Tsuga is the Japanese name for Japanese hemlock. In the nineteenth century, hemlocks were first classified as a pine, then as a fir, and later as a spruce. After the discovery of Japanese hemlock, hemlocks were assigned to the genus Tsuga.

Hemlocks are in the pine family (scientific name: Pinaceae) and are unique in the family. They have a distinctive drooping leader at the top of the tree. Hemlocks also have the smallest cones in the pine family. They can tolerate growing in the shade of other large trees for years. However, hemlocks can grow to enormous size and eventually dominate other trees in the forest. Although they can grow in the shade of Douglas fir for hundreds of years, in the normal succession of a Douglas fir forest, the hemlocks will eventually prevail, forming the canopy of the mature forest.

Western hemlock
At least nine species of hemlock grow in North America and Asia. Curiously, they are absent from Europe. Four species are native to North America, with two of them in the Pacific Northwest, western hemlock and mountain hemlock. They are important commercial trees, used to make lumber, plywood and pulp for paper. However, the beauty of their drooping form and delicate branchlets far exceeds their usefulness as lumber. And pulp? How degrading. Their purpose is better served by horticulturists, who have developed many popular cultivars.

Mountain hemlock
Hemlock needles are short and usually flattened on the twig, but they have a tendency to deviate from their flattened position. The needles are dark on top with two white lines on the lower surface. The cones are usually less than an inch long, and the scales are thin and rounded. Mountain hemlock is an exception to these characteristics, with bluish needles that make no pretense about lying flat, surrounding the twig in all directions. Also, the cones are over achievers, being twice as large as other hemlock cones.

Western hemlock at Elk Mountain
Hemlocks flourish in wet, cool environments. They can tolerate a heavy snowpack, not with strength, but by bending. They will spring back when the snow melts in the spring. On the other hand, one thing they do not tolerate is drought. Unless you live east of the Cascade Mountains, a hemlock would be a graceful addition to your yard, whether it is a cultivar or one of our natives.

More info
Tsuga at conifers.org
Tsuga in Wikipedia

Friday, December 6, 2019

Conifers By Genus


Many people who love nature and hiking in the woods of the Pacific Northwest like to identify the individual species of the flowers, birds, trees, and other plants and wildlife they see there. However, learning all these names can be a taxing task that requires time and a backpack full of nature books. Someone asked me recently to identify not a particular species, but just how to identify a tree as a fir. This seems like a good way to start learning the conifers. So here is an overview of the conifers of the Northwest that can help you ID each genus.




Firs Abies

The cones of the firs are perched on the top of the upper branches, and fall apart at maturity when they disperse their seeds. So you seldom see any fir cones lying under the trees. Look for the cones in the tree tops in the summer. The bark is smooth with resin blisters on younger stems and has furrows between smooth plates on larger trunks. The needles have an orderly, groomed look, usually flattened or curved upwards.  All the needle tips of Northwest firs are soft and not prickly. Finally, when the needles fall off, they leave round, flat scars on the twig. Abies is the scientific name of the genus, from the Latin abeo, which means "to rise."

Douglas fir Pseudotsuga

Now, what about Douglas fir? It is very different from the firs described above, and its unique features make it easy to identify. The thin needles stick out in all directions from the twig like a bottle brush. Although their appearance is similar to that of spruce needles, the Douglas fir needle tips are soft, unlike the sharp spruce needles. Finally, look at the buds if there are any. Douglas fir has unique buds that are long and pointed, unlike the short, rounded buds on the true firs.

Douglas fir cones are the only ones you will find in the Northwest with three-pointed bracts sticking out of the scales.  Unlike the true firs, the cones hang down rather than standing up on the branch. Also unlike the true firs, the Douglas fir drops its cones to the ground intact. When you see these unique cones on the ground, you know that you are standing near to a Douglas fir.  You can usually identify a large Douglas fir by the bark alone. On large trees, the thick bark is deeply furrowed, more than any other tree in the region. The color is gray to brown and usually brown at the bottom of the furrows. The scientific name, Pseudotsuga, tells you that the Douglas fir is in a different genus from the Abies genus of the firs. Pseudotsuga means “false hemlock.”

Hemlocks Tsuga

Western hemlock
The Northwest has two species of Hemlock. It is easy to distinguish them from other native conifers by their short, flat needles and by the drooping leaders at the top of each tree. The cones have rounded scales like Douglas fir, but don't have bracts protruding from them. The scientific name, Tsuga, is the Japanese word for hemlock tree.

Pines Pinus

Although pines are the most common conifer throughout the world, they don't compete as well in the climate of western Oregon and Washington where forests are dark, damp, and dense. You will find them high in the mountains in more open forests and east of the Cascades summit where the weather is dry. Pines have long needles that grow in bundles of two to five. The cones are the largest you will find in the Northwest. Unlike the thin scales on hemlock and spruce cones, pine cones have thick, woody scales. Pinus, of course, means "pine tree."

Spruces Picea

The Spruces are easy to identify. The needles look like Douglas fir needles, but the points are sharp. Also, each spruce needle grows on a small peg. These unique pegs remain even after a branch loses its needles. The cones have paper-thin scales that tend to come to a point. The bracts are not visible. The bark is gray and breaks into small scales on large trees. Picea is derived from the Latin for "pitch."



Larches Larix

Unlike most conifers, larches are deciduous, dropping their needles in the fall. The needles grow in bundles like the pines, and have about 25 needles per bundle. The needles usually grow on a distinctive little spur twig. Larix, translates from Latin to "larch."





Cedars

The cedars of North America are very different from the "true cedars" (genus cedrus) of the Himalayas and the Mediterranean region. These cedars and all of our native conifers above belong to the pine family. All our native cedars belong to the cypress family. They are easy to distinguish from other native conifers because they all have flat, scale-like leaves, unlike the needles found on other conifers.



Yews - Taxus

Pacific Yew (Taxus brevifolia) is our only native species of the yew family. Pacific yews have short, flat, needles that spread out on opposite sides of the twig in flattened rows. They are dark green on top and lighter green below. The needles are about 1 inch long, but become shorter near the tip of branchlets. Pacific Yew bark is smooth and purple or red-brown. It is often covered by a peeling, papery gray or brown layer.

Families

If you find identifying each native genus too daunting, you can always fall back to just identifying the families. There are only three families of conifers native to North America:
  • The yew family – trees with needles and smooth, purple bark.
  • The pine family – other trees with needles.
  • The cypress family – cedars with flat leaves and junipers with awl-shaped leaves.


For information on the individual species, see Overview at Northwest Conifers.