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Systematic Revision of the Sucker Creek and Trout Creek Miocene Floras of Southeastern Oregon

Alan Graham
American Journal of Botany
Vol. 50, No. 9 (Oct., 1963), pp. 921-936
Stable URL: http://www.jstor.org/stable/2439780
Page Count: 16
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Systematic Revision of the Sucker Creek and Trout Creek Miocene Floras of Southeastern Oregon
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Abstract

The Sucker Creek flora is preserved in shales of volcanic origin exposed in Malheur County, southeastern Oregon. A study of the flora has been made and the systematic revisions presented. The following new species are described: Osmunda claytonites, Davallia solidires, Shepherdia argenteaites, Magnolia ovulata, Anoda suckerensis, and Platanus youngii. A new combination, Hiraea knowltoni (Berry), is proposed. Additional synonymies, Incertae Sedis, and other taxonomic changes are included. The Trout Creek flora is to the west of Sucker Creek in Harney County, southeastern Oregon. The fossils are preserved in diatomite. Fourew species are described: Equisetum miocenicum, Gossypium arnoldii, Urena miocenica, and Spiraea miocenica. New combinations are Pteridium calabazensis (Dorf), and Nymphaea rotunda (Arnold). A revised species list is given for the 2 floras. The Sucker Creek flora contains 47 families, 60 genera, and 69 species, presently identified. The Trout Creek flora contains 29 families, 51 genera, and 75 species. The distributional, ecologic, and geologic interpretations of the 2 floras will be presented in a subsequent publication.

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