Pleuropogon oregonus Chase

Oregon semaphoregrass



Taxonomy & Nomenclature



Conservation Status

Rediscovered in 1985 or before



Oregon, USA


Biology & Ecology










Ayensu, E.S. & Defilipps, R.A. (1978). Endangered and Threatened Plants of the United States: 1-403. Smithsonian Institution and WWF-US, Washington DC.

But, P. P. H., Kagan, J., Crosby, V. L. and Shelly, J. S. (1985). Rediscovery and reproductive biology of Pleuropogon oregonus (Poaceae). Madrono 32(3): 189-190.

Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.

Humphreys, Aelys M., Govaerts, Rafaël, Ficinski, Sarah Z., Lughadha, Eimear Nic and Vorontsova, Maria S. (2019). Global dataset shows geography and life form predict modern plant extinction and rediscovery. Nature Ecology & Evolution 3: 1043-1047. [Supplementary Dataset 1]

Kagan, Jimmy and Vrilakas, Susan. (1993). Extinct and Extirpated Plants from Oregon. Kalmiopsis [1993]: 12-16.

Siddall, J. L., Chambers, K. I. and Wagner, D. H. (1979). Rare, threatened and endangered vascular plants in Oregon — an interim report. Oregon Natural Area Preserves Advisory Committee, Division of State Lands. 109 pp.


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