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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Full Ref:
Egger, J.M. 2008. Nomenclatural changes and selected lectotypifications in Castilleja (Orobanchaceae). Phytologia 90(1): 63-82.
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Ellison, A. M., L. B. Hannah, T. E. Miller, and N. J. Gotelli. 2004. Morphological variation in Sarracenia purpurea (Sarraceniaceae): Geographic, environmental, and taxonomic correlates. Amer. J. Bot. 91: 1930-1935.
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Emadzade et al. 2010. A molecular phylogeny, morphology and classification of genera of Ranunculeae (Ranunculaceae). Taxon 59(3): 809–828.
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Endangered, Threatened & Sensitive Vascular Plants of Washington, Washington Natural Heritage Program web site