The following document presents a series of one-page descriptions of those vascular plants in Oregon currently being reviewed by the U.S. Fish and Wildlife Service for possible protection under the Endangered Species Act of 1973, as amended. It offers basic information on the identification, ecology, and geographic distribution of each taxon. Its purposes are to summarize current knowledge of each of these species and to stimulate further research on them. It is anticipated that this guide will be useful to both the professional and the concerned layperson. It should be of interest to anyone working with the rare plants found in Oregon. However, it has been designed primarily for those government land managers and field personnel who are responsible for determining and implementing public land policy affecting the majority of candidate species within the state. It is not a substitute for technical floristic works or detailed local reports, but provides the degree of familiarization necessary for land managers who wish to recognize the potentially threatened or endangered plants which occur in their areas.