[Trees with Compound-pinnate Leaves]

Above images are of the upper (left) and lower (right) leaf surfaces of an Oregon Ash.

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Habitat:

Oregon Ash is a native tree found on moist, sandy, rocky, or gravelly soils, often near streams, lakes, or in bottomlands around the edges of swampy areas. It is found from sea level to an elevation of 2500 feet.

The Oregon Ash is frequently found in association with Bigleaf Maple, Black Cottonwood, Red Alder, willows, Oregon White Oak, Douglas Fir, and Grand Fir.

Range:

Oregon Ash is found on the west side of the Cascade Mountains from southwest British Columbia south through Washington and Oregon to central California.

Characteristics:

Oregon Ash is a tree, reaching at most a height of 80 feet. Its trunk may be as much as 1' to 2-1/2' in diameter. The leaves are 5" to 14" long, with 5 to 9 broadly ovate, obovate, or elliptical leaflets. The edges of the leaflets are entire, but may also be somewhat toothed. The fruit is a winged and pointed samara (looks like one-half of a winged maple seed).