File:Vegetation of Oregon and Washington (1969) (20580298791).jpg

Title: Vegetation of Oregon and Washington
Identifier: CAT92272720 (find matches)
Year: 1969 (1960s)
Authors: Franklin, Jerry F. cn; Dyrness, C. T
Subjects: Botany Oregon Ecology; Botany Washington (State) Ecology
Publisher: Portland, Or. : Pacific Northwest Forest and Range Experiment Station, U. S. Dept. of Agriculture
Contributing Library: U.S. Department of Agriculture, National Agricultural Library
Digitizing Sponsor: U.S. Department of Agriculture, National Agricultural Library

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Figure 58. — Abiesprocera attains maximum develop- ment on mesic sites in the Abies amabil- is Zone; these sites are characterized by herb-rich understories (near Mount St. Helens, Gifford Pinchot National Forest, Washington). There is considerable geographic variation in Abies amabilis communities. Thornburgh (1969) found it more useful to consider Abies amabilis Zone communities near Mount Rai- nier as a continuum. In the Olympic Moun- tains (Fonda 1967) and Northern Cascade Range, herb-rich communities characterized by species such as Oxalis oregana or Struthi- opteris spicant are more common than in the southern Washington Cascades. In Oregon, changes include: (1) reduced importance of Vaccinium alaskaense-Cornus canadensis com- munities, (2) increased importance of com- munities with herbaceous and Vaccinium membranaceum-Xerophyllum tenax under- stories, and (3) addition of Rhododendron macrophyllum as an understory dominant on some sites. A community dominated by Picea engelmannii and Abies amabilis with a rich herbaceous understory is found on wet, frosty habitats in Oregon's western Cascade Range.

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