Literature References

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.

View literature beginning with:
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Literature beginning with P:
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Packer, J. G. and G. S. Ringius. 1984. The distribution and status of Acorus (Araceae) in Canada. Canad. Journal of Botany 62: 2248-2252.
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Payne, M. A. 1933. Morphology and anatomy of Mollugo verticillata L. Univ. Kansas Sci. Bull. 21: 399-419.
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Payne, M. A. 1935. The flower and seed of Mollugo verticillata. Univ. Kansas Sci. Bull. 22: 5-25.
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Payson, E.B. 1927. A monograph of the section Oreocarya of Cryptantha. Ann. Missouri Bot. Garden 14: 211-358.
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Peck 1961
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Peck, M. E. 1961. A Manual of the Higher Plants of Oregon, 2nd ed. Binfords and Mort, Portland. 936 p.
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Philbrick, C. T. 1989. Systematic studies in North American Callitrichaceae. Unpubl. Ph.D. diss., Univ. of Connecticut, Storrs, CT.
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Phillips, R. C. 1964. Comprehensive Bibliography of Zostera marina. Washington. U.S.D.I. Fish Wildlife Serv., Special Sci. Rep. Wildlife 79.
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Phillips, R. C. and R. F. Shaw. 1976. Zostera noltii Hornem. in Washington, U.S.A. Syesis 9: 355–358.
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Phipps, J. B. 1995. The identity of Crataegus columbiana and its relationship to C. piperi (Rosaceae). Taxon 44: 405-408.
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Phipps, J. B. 1998. Introduction to the red-fruited hawthorns (Crataegus, Rosaceae) of western North America. Canadian Journal of Botany 76: 1863-1899.
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Phipps, J. B. 1999a. The genus Crataegus (hawthorn) of the Pacific Northwest. Menziesia 4(4): 11-13.
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Phipps, J. B. 1999b. Relationships of the American black-fruited hawthorns C. erythropoda, C. rivularis, C. saligna and C. brachyacantha to C. ser. Douglasianae. Sida 18: 647-660.
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Phipps, J. B. and R. J. O'Kennon. 1998. Three new species of Crataegus (Rosaceae) from western North America. C. okennonii, C. okanaganensis and C. phippsii. Sida 18: 169-191.
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Phipps, J. B. and R. J. O'Kennon. 2002. New taxa of Crataegus (Rosaceae) from the northern Okanagan-southwestern Shuswap diversity center. Sida 20: 115-144.
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Phipps, J. B., with R. J. O'Kennon and R. W. Lance. 2003. Hawthorns and Medlars. Timber Press, Portland.
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Phytologia 76: 384. 1994.
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Phytoneuron 2012-39: 1–60.
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Phytoneuron 2012-40: 1–120.
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Phytoneuron 2015-25: 1–12.
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Phytoneuron 40: 1–123.
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Taxon. 2017. 66:119-132.
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Piirainen, M., Liebisch, O., and G. Kadereit. 2017. Phylogenty biogeography, systematics and taxonomy of Salicornioideae (Amaranthaceae/Chenopodiaceae) - A cosmopolitan, highly specialized hygrohalophyte lineage dating back to the Oligocene. Taxon 66:119-132.
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Taxon 66:109-132. 2017
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Piirainen, M., O. Liebisch, and G. Kadereit. 2017. Phylogeny, biogeography, systematics and taxonomy of Salicornioideae (Amaranthaceae / Chenopodiaceae) – A cosmopolitan, highly specialized hygrohalophyte lineage dating back to the Oligocene. Taxon 66:109–132.
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Taxon 66:109–132. 2017.
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Piirainen, M., O. Liebisch, and G. Kadereit. 2017. Phylogeny, biogeography, systematics and taxonomy of Salicornioideae (Amaranthaceae / Chenopodiaceae) – A cosmopolitan, highlyspecialized hygrohalophyte lineage dating back to the Oligocene. Taxon 66:109–132.
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Pilz, G. E. 1978. Systematics of Mirabilis subgenus Quamoclidion (Nyctaginaceae). Madroño 25: 113-132.
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Piper, C. V. 1906. Flora of the State of Washington. Contributions from the U. S. National Herbarium, Volume 11. Government Printing Office, Washington, D. C. 637 p.
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Piper, C.V. 1920. A study of Allocarya. Contributions of the U.S. National Herbarium 22: 79-113.
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Pollen, M. 2001. The Botany of Desire. Random House, New York. 271 p.
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Porter, J. M. and L. A. Johnson. 2000. A phylogenetic classification of Polemoniaceae. Aliso 19(1): 55-91.
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Porter, J.M. 1998. Aliciella, a recircumscribed genus of Polemoniaceae. Aliso 17:23-46.
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Posluszny, U. and P. B. Tomlinson. 1977. Morphology and development of floral shoots and organs in certain Zannichelliaceae. Bot. J. Linn. Soc. 75: 21–46.
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Potter, D., T. Eriksson, R. C. Evans, S. H. Oh, J. E. E. Smedmark, D. R. Morgan, M. Kerr, K. R. Robertson, M. Arsenault, T. A. Dickinson, and C. S. Campbell. 2007. Phylogeny and classification of Rosaceae. Plant Systematics and Evolution 266: 5–43.
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Preston, R.E. 2013. Systematic Botany, 38(4): 1012-1028.
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Pridgeon, A. M. et al. 1997. Phylogenetics of subtribe Orchidinae (Orchidoideae, Orchidaceae) based on nuclear ITS sequences: 1. Intrageneric relationships and polyphyly of Orchis sensu lato. Lindleyana 12: 89-109.
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PPG 2016
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Pteridophyte Phylogeny Group (PPG) I. 2016. A community-derived classification for extant lycophytes and ferns. J. Syst. Evol. 54:563–603.
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