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Endangered species, Oregon, Oregon Natural Heritage Program, Endangered species -- Oregon -- Distribution, Endangered species -- Classification


Extinction is a natural process. Today, however, plant and animal species are disappearing world-wide at an accelerated pace. Based on current trends, half of the species on earth will be extinct within the next 100 years. The major cause of this phenomenon is large-scale destruction of native habitats, which has increased since European settlement began in the mid 1800's - in Oregon and throughout the New World.

Once lost, a species can never be recovered, and there is no way of knowing how useful it may have been. We do know that human beings and many of their industries depend on plant and animal products. About 50% of all pharmaceuticals have a natural component as an active ingredient, yet less than one percent of the world's species have been chemically analyzed and tested. Many invertebrates and plants contain undescribed and highly functional compounds. Limnanthes floccosa subsp. grandiflora, or wooly meadow-foam, a rare plant that grows in southwest Oregon, has been recently found to produce a hybrid with the more common member of the genus, Limnanthes alba. This hybrid grows well in the poorly drained soils of the Willamette Valley and produces a valuable oil used for soaps, plastic and rubber production. In addition, the new hybrid meadow-foam does not require the field burning necessary for other crops. This species, and many other Oregon natives, will be lost without intervention. The purpose of this publication is to provide land managers, owners and interested parties with a list of those species in Oregon which are in greatest jeopardy.


At the time of writing, Eleanor Gaines was affiliated with Oregon State University.

A production of the Oregon Natural Heritage Information Center (ORNHIC), part of the Information Program of the Institute for Natural Resources of Oregon State University (OSU).

Persistent Identifier

2004-inverts.xls (67 kB)
2004 rare invertebrate animals of Oregon list

2004-nonvascs.xls (104 kB)
2004 rare nonvascular plants of Oregon list

2004-vascs.xls (176 kB)
2004 rare vascular plants of Oregon list

2004-verts.xls (86 kB)
2004 rare vertebrate animals of Oregon list

2004-vert-notes.pdf (73 kB)
Notes on 2004 vertebrate animal ranking

2004-vasc-notes.pdf (47 kB)
Notes on 2004 vascular plant ranking

2004-nonvasc-notes.pdf (69 kB)
Notes on 2004 nonvascular plant ranking

2004-invert-notes.pdf (46 kB)
Notes on 2004 invertebrate animal ranking