United States Department of Guide to Common Agriculture Forest-Zone Plants Forest Service Pacific Willamette, Mt. Hood, and Northwest Region Siuslaw National Forests 1982
• PROPEWN OP: FOREST BEIRMIE MAW 11.51 U.FORESTRY S. SCIENCES LN.,i3ORATCRY CORVALL,R,, OREGON Guide to Common Forest-Zone Plants Willamette, Mt. Hood, and Siuslaw National Forests
Compiled By Christopher Topik, Graduate Student, University of Oregon
Miles A. Hemstrom, Area Ecologist
United States Forest Service R6-Ecol 101-1982
Department of Pacific Northwest Region May 1982 Agriculture
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This guide contains brief descriptions and line drawings of the most common woodland vascular plants of the Willamette, Mt. Hood, and Siuslaw National Forests.
Site descriptions will be less accurate for other areas, though this booklet will be useful throughout Western
Oregon north of Douglas County.
The guide is intended to aid land managers and forest technicians in making accurate floral identifications.
Knowledge of the vegetation is the first step in applying resource-based land mananagement including the land management guidelines developed by the Area Ecology
Program s habitat-typing projects. The floral composi of a site is largely due to environmental effects; the species composition persisting in our woodlands has integrated over time climatic and soil interactions.
Therefore careful observation of a site s flora can provide productivity and environmental sensitivity information. LL
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Stanford University Press) are suitable references for that area.
Organization of the guide is first by growth form
(tree, shrub, fern, herb, grass, parasite) and second, for the herbs, by systematic ordering of the plant families as done by Hitchcock and Cronquist. This ordering of plant families places simple or reduced flower types first and complex, specialized flower types later.
Because the first separation is by growth form (an arbitrary character), members of the same plant family can be found in different sections of the guide.
We have attempted to keep technical botanical language to a minimum without sacrificing precision. Some words will be unfamiliar to most casual users, but they can be readily found in a dictionary. Before using the guide in the field, we recommend that the user check for unfamiliar words and jot down key definitions where necessary. This booklet can not substitute for a botanical education, but it can help refresh and guide the user to the most common local species.
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