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Flowering Cherry (Prunus serrulate) These Japanese cherry trees are favorites because of their spectacular blossoms which herald the onset of spring, both here and in Japan. The Latin word Prunus means plum or cherry, but this species does not produce edible fruit. Mature trees grow to 35 feet high. In contrast to these trees, we have several weeping Japanese cherry trees near the Duck Pond. |
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Douglas Fir (Pseudotsuga menziesii) The Douglas Fir is native to the PNW and has been designated as the state tree of Oregon. It is one of the taller trees on earth (70- 330 feet) and is prized for its economic value (construction material) and as a specimen landscape plant. It is not a true fir (Abies) or pine (Pinus) as often referred to, but a “false hemlock”. The 1-2 inch needles are all the way around the stem and the female cone has a three pointed bract protruding from under the scales. |
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Black Cottonwood (Populus trichocarpa) Location: Second downhill curve from north end of River Walks Overview: large deciduous tree native to Northwest; 100-160’ tall, known for its rapid growth. ID Tips: heart-shaped leaves, dark green on top, silvery-white beneath, turning yellow in fall. Female trees release cottony seeds in the spring. Of interest: The world record largest living Black Cottonwood tree is in Willamette Mission State Park, north of Salem, with a circumference of almost 29' feet, and estimated height 155’. |
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Northern Red Oak (Quercus rubra) Location: On River Walk, on the second curve winding down from the north end, near the bench. Overview: Large broadleaf deciduous tree, 60-75’ and very broad, with thick, ascending branches, often starting near base of tree. ID Tips: Leaves have 7-11 lobes, sharply pointed and with bristles; acorns are 2- 2.5 cm long, held at base by shallow, scaley cup. Fall color from yellow to orange to red. Of interest: Red oak wood is valued for cabinetry, flooring, and interior trim. Its open pores allow it to stain well, but make it susceptible to rot if used outdoors. This tree is a mere sapling; there is a much larger Northern Red Oak near the Neighborhoods building. |
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Red Osier Dogwood (Cornus sericea) Location: north end of River Walk trail Overview: Deciduous shrub, 5-12’ tall, shrub form of tree family, Cornus ID Tips: brilliant red stems in winter, turning grayish with age; white flowers in spring. Of interest: Also known as Red Twig dogwood. Excellent food and cover for native birds. |
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Oregon White Oak (Quercus garryana) Our native White Oak is a slow growing, medium sized (40-60 feet) deciduous tree with good drought tolerance. It is found west of the Cascade Range from British Columbia to California. Oak Grove gets its name from the abundance of these trees in the Willamette Valley. |
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Oregon Ash (Fraxinus latifolia) This is the only ash tree native to the Pacific Northwest. It likes moist ground. Latifolia (wide leaves) means its leaves are wider than most ash trees. It can grow up to 100 feet high and live more than 100 years. Its hard wood is used in furniture and flooring, particularly for axe handles and baseball bats. |
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Cherry Plum (Prunus cerasifera) This early blooming tree is native to SE Europe (Romania) and Western Asia (Georgia). Some cultivars, like this one, have purple foliage. Cerasifera means its fruit looks like cherries, hence the name Cherry Plum. Compare with the nearby Indian Plum. Neither tree bears fruit suitable for human consumption. |
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Scouler’s Willow (Salix scouleriana) This mountain willow is widespread in the Pacific Northwest. It was named after the Scottish naturalist John Scouler. It is a small tree with multiple stems that peak out at 20 feet. It invades quickly after wildfires or logging, but is short-lived. Its narrow winter buds can produce the familiar "pussy willows" in spring. |
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Indian Plum (Oemleria cerasiformis) This is a Pacific Northwest native that only grows to about 20 feet in height. Cerasiformis means cherry-shaped. It is the only species in the genus Oemleria, named after a German naturalist. As with other plants, Indian Plum has many alternate names: Oregon Plum, Osoberry, Indian Peach, Bird Cherry and Skunkbush. Its bright greenish-white flower clusters indicate spring has arrived. |
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Cascara (Rhamnus purshiana) Another Northwest native, Cascara is the Spanish word for bark. Its smooth gray bark was made into a laxative tea by Native Americans. Its leaves turn a brilliant yellow in fall. |
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Mountain Ash (Sorbus aucuparia) Also called Rowan, this tree can grow to 50 feet in height. It has a slender trunk with smooth bark. The small yellowish white flowers develop into clusters of red berries, which are very prominent from late summer to early autumn. It is quite different from the nearby Oregon Ash. |
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Blue Blossom (Ceanothus thyrsiflorus) True to its name, this large shrub sports large clusters of blue blossoms. Another name is California lilac, although it is also native to Oregon. It requires very little care and is drought resistant. The glossy leaves look attractive throughout all seasons. |
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Black Tupelo (Nyssa sylvatica) This is a medium-sized deciduous tree growing up to 50 feet high. It is native to eastern North America. Tupelo is the Creek Indian word for swamp, so perhaps this tree is well situated. Because its wood is highly cross-grained, it is very difficult to split, making it ideal for handles of heavy tools. |
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Pacific Madrone (Arbutus menziesii) Pacific madrones are recognized by their smooth, bright orange-red branches. Its upper red-brown bark peels each summer in thin strips to reveal smooth, greenish-yellow bark that turns into a deep, dark red color. This cluster of trees appears to have suffered over the years, but is making a comeback. Madrones seek out light from among other large trees and can lean as much as 15 degrees. They are related to blueberries, mountain laurels, rhododendrons, and manzanita. Another member of the Arbutus family is the Strawberry Tree near the Duck Pond. |
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Redbud (Cercis canadensis) Location: Southern end of River Walk, beyond boardwalk; look to the left to view redbud at corner of River Ridge home. Overview: Small deciduous tree, 25’ high and wide, noted for early spring appearance of purple/pink blossoms along the branches before it leafs out. ID Tips: Leaves are heart-shaped, turning yellow in the fall. Its hanging fruit resembles pea pods, and this tree is, in fact, a member of the pea family. Of interest: Redbud is an understory tree, and enjoys woodsy margins where it gets some sunlight but also the shelter of larger trees. |
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Douglas Fir (Pseudotsuga menziesii)The Douglas Fir is native to the PNW and has been designated as the state tree of Oregon. It is one of the taller trees on earth (70- 330 feet) and is prized for its economic value (construction material) and as a specimen landscape plant. It is not a true fir (Abies) or pine (Pinus) as often referred to, but a “false hemlock”. The 1-2 inch needles are all the way around the stem and the female cone has a three pointed bract protruding from under the scales. |
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Coral Bark Maple (Acer palmatum ‘Sango Kaku’) This is a relatively large Japanese maple, growing up to 25 feet tall. In the winter the bark develops a bright coral red color, which contrasts nicely with its foliage, which changes from light green in spring to darker green to golden yellow or orange or red in the fall. To see this tree's reddish bark, look up at the younger branches. In Japanese, Sango means sea coral, and Kaku means upward growing. The name suggests coral rising upward from a reef. |
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Red Maple (Acer rubrum) This is the most abundant native tree in eastern North America. It can attain a height of 100 feet. Although its flowers, twigs and seeds are all red, its deep scarlet fall foliage is most impressive. |
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Hinoki Cypress (Chamaecyparis obtusa) This Japanese native is slow-growing, reaching heights over 100 feet with trunks up to 3 feet in diameter. The leaves are long and blunt-tipped (obtuse), different from the pointed tips of the Sawara Cypress in the Duck Pond area. Hinoki means cypress in Japanese. In Japan its high quality lumber is used to build beautiful shrines, temples and palaces. |
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Tulip Poplar (Liriodendron tulipifera) Location: Southern end of River Walk just before trail turns uphill Overview: Among the tallest forest trees, it can reach over 150’, often not branching until 50-100’ above the ground. ID Tips: 4-lobed leaf with the top squared off, resembling a cat face; flowers resemble bright yellow and orange tulips and sit upright on the branches. Of interest: Not a true poplar, this tree is actually a member of the Magnolia family. |
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Blue Spruce (Picea pungens) The Colorado blue spruce, prominent in the Christmas tree industry, can reach 75 feet in height if left to grow. This evergreen is slow growing, taking 10 years to reach 6 feet. It can live up to 800 years. Pungens means sharply pointed, referring to its leaves. |
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Common Alder (Alnus glutinosa) Also called black alder, this species is native to Europe, western Asia and northern Africa. Alder trees like moist surroundings and can grow fast. They are easily recognized because of their peculiar, long woody cones which hang like lanterns. Its leaves shed while still green. |