The following literature references are cited in the Washington Flora Checklist. These may include floras, journal articles, monographs, theses, web sites, and other scholarly resources.
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Ogle, D. W. 1984. Phytogeography of Vaccinium macrocarpon Aiton in the southern United States. Virginia J. Sci. 35: 31-47.
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Ohwi, J. 1984. Flora of Japan (in English). Smithsonian Institution, Washington, D.C.
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Olmstead, R.G., C.W. dePamphilis, A.D. Wolfe, N.D. Young, W.J. Elisons and P. A. Reeves. 2001. Disintegration of the Scrophulariaceae. American Journal of Botany. 88:348-361.
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Oregon Flora Project web site
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Ornduff, R. 1963. Hieracium revisited. Leaflets W. Botany 10: 38.
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Ornduff, R. 1966. Impatiens capensis in Oregon: native or naturalized? Leaflets of Western Botany 10: 317-319.
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Ornduff, R. 1967. Hybridization and regional variation in Pacific Northwestern Impatiens (Balsaminaceae). Brittonia 19: 122-128.
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Ostenfeld, C. H. 1905. Preliminary remarks on the distribution and the biology of the Zostera of the Danish seas. Bot. Tidsskr. 27: 123–125.
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Ownbey, M. and W.A. Weber. 1943. Natural hybridization in the genus Balsamorhiza. American Journal of Botany 30: 179-187.
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Oxelman, B. 1997. Chloroplast rps 16 in the phylogeny of the tribe Sileneae (Caryophyllaceae). Pl. Syst. Evol. 206: 393-410.