Bibiography:  Author Listing
Author group 'P'

Packard, J.M. and T.L. Cook. 1995. Effects of climate change on biodiversity and landscape linkages in Texas. In: J. Norwine, J.R. Giardino, G.R. North, J.B. Valdés, eds The changing climate of Texas: Predictability and implications for the future, Chapter 23 Pp. 322-336, GeoBooks, Texas A&M Univ., College Station.

Paclt, J. 1998. (1334) Proposal to amend the gender of Nuphar, nom. cons. (Nymphaeaceae), to neuter Taxon 47:167-169.

Padgett, D. J. 1999. Nomenclatural novelties in Nuphar (Nymphaeaceae). Sida 18(3): 823-826.

Page, C. N. 1976. The taxonomy of phytogeography of braken -- a review. Journal of the Linnean Society. Botany 73:1-34.

Palmer, E.J. 1920. The canyon flora of the Edwards Plateau of Texas J. Arnold Arbor. 1:233-239.

Palmer, E.J. 1925. Synopsis of North American Crataegi J. Arnold Arbor. 6:5-128.

Palmer, E.J. 1946. Crataegus in the northeastern and central United States and adjacent Canada Brittonia 5:471-490.

Palmer, E.J. 1948. Hybrid oaks of North America J. Arnold Arbor. 29:1-48.

Palmer, E.J. 1960. Key to Crataegus species. In: R.A. Vines Trees, shrubs, and woody vines of the Southwest Pp. 329-334, Univ. of Texas Press, Austin.

Palmer, P. G. 1975. A biosystematic study of the Panicum amarum-P. amarulum complex (Gramineae). Brittonia 27:142-150.

Palmer, R. 1988. A field checklist: National Audubon Society's Sabal Palm Grove Sanctuary. Mimeographed.

Pammel, L.H. 1911. A manual of poisonous plants The Torch Press, Cedar Rapids, IA.

Parfitt, B.D. 1997. Adonis. IN: Flora of North America Editorial Committee, eds, Fl. North Amer. 3:184-187 Oxford Univ. Press, New York and Oxford.

Paris, C.A. 1993. Adiantum. In: Flora of North America Editorial Committee, eds, Fl. North Amer. 2:125-130 Oxford Univ. Press, New York and Oxford.

Park, K. 1998. Monograph of Euphorbia sect. Tithymalopsis (Euphorbiaceae) Edinb. J. Bot. 55:161-208.

Park, M.M. and D. Festerling, Jr. 1997. Thalictrum. In: Flora of North America Editorial Committee, eds, Fl. North Amer. 3:258-271 Oxford Univ. Press, New York and Oxford.

Parker, K. F. 1981. New combinations in Tetraneura Greene (Heliantheae, Asteraceae). Phytologia 45:467.

Parker, W.B. 1856. Through unexplored Texas [notes taken during the 1854 Marcy Expedition] Hayes and Zell, Philadelphia, Reprinted 1990 by the Texas State Historical Association, Austin.

Parks, H. B. 1937. Valuable Plants Native to Texas. Bulletin No. 551. Texas Agricultural Experiment Station, College Station.

Parks, H. B. 1949. A list of plants reported to occur in Brazos County, Texas. (compiled between 1945-1949). Mimeorgraphed.

Parks, H. B. and V. L. Cory. 1938. The Fauna and Flora of the Big Thicket Area. 2nd ed. Sam Houston State Teaching College, Huntsville, TX.

Parks, H. B. and V. L. Cory. 1958. Biological Survey of the East Texas Big Thicket Area. Sam Houston State Teaching College, Huntsville, TX.

Parodi, L. R. 1947. Las especies de gram­neas del género Nassella de la Argentina y Chile. De Darwiniana 7:369-395.

Parry, C.C. 1889. Ceanothus, L.: A synoptical list, comprising thirty-three species, with notes and descriptions Proc. Davenport Acad. Nat. Sci. 5:162-176.

Paton, A. 1990. A global taxonomic investigation of Scutellaria (Labiatae). Kew Bulletin 45(3):399-450.

Payne, W.W. 1964. A re-evaluation of the genus Ambrosia (Compositae) J. Arnold Arbor. 45:401-430.

Payson, E. B. 1921. A monograph of the genus Lesquerella. Annals of the Missouri Botanical Garden 8:103-236.

Payson, E.B. 1918. The North American species of Aquilegia Contr. U.S. Natl. Herb. 20:133-157.

Payson, E.B. 1922a. Species of Sisymbrium native to America north of Mexico Univ. Wyoming Publ. Bot. 1:1-27.

Payson, E.B. 1922b. A synoptical revision of the genus Cleomella Univ. Wyoming Publ. Bot. 1:29-46.

Payson, E.B. 1926. The genus Thlaspi in North America Univ. Wyoming Publ. Bot. 1:145-163.

Peabody, F.J. 1984. Revision of the genus Robinia (Leguminosae: Papilionoideae) Ph.D. dissertation, Iowa State Univ., Ames.

Peacock, H. 1982. Just plain poke Texas Highways 29:8-11.

Peattie, D.C. 1948. A natural history of trees of eastern and central North America Houghton Mifflin Co., Boston, MA.

Pedersen, T. M. 1972. Cyperus rigens Presl subsp. Cephalanthus (Torrey & Hooker) T. M. Pedersen. De Darwiniana 17:539.

Pellmyr, O. and E.J. Augenstein. 1997. Pollination biology of Hesperaloe parviflora SouthW. Naturalist 42:182-187.

Pendleton, BB; Teetes, GL; Parker, RD 2000. Quantifying Texas sorghum growers' use of IPM for insect pests Southwestern Entomologist, 25 (1) pp. 39-53, 2000

Peng, C.I. 1988. The biosystematics of Ludwigia sect. Microcarpium (Onagraceae) Ann. Missouri Bot. Gard. 75:970-1009.

Peng, Ching-I. 1989. The systematics and evolution of Ludwigia sect. Microcarpium (Onagraceae). The Annals of the Missouri Garden 76:221-302.

Pennell, F. W. 1935. The Scrophulariaceae of Eastern Temperate North America. Wickersham Printing Co., Lancaster, PA.

Pennell, F. W. 1940. Scrophulariaceae of Trans-Pecos Texas. Proceedings of the Academy of Natural Sciences of Philadelphia 92:289-308.

Pennell, F.W. 1916. Commelina in the United States Bull. Torrey Bot. Club 43:96-111.

Pennell, F.W. 1920. Scrophulariaceae of the southeastern United States Contr. New York Bot. Gard. 221:224-291, Reprinted from Proc. Acad. Nat. Sci. Philadelphia, 1919.

Pennell, F.W. 1928. Agalinus and allies in North America-I Proc. Acad. Nat. Sci. Philadelphia 80:339-449.

Pennell, F.W. 1929. Agalinus and allies in North America-II Proc. Acad. Nat. Sci. Philadelphia 81:111-249.

Pennell, F.W. 1933. Polygala verticillata and the problem of typifying Linnean species Bartonia 15:38-45.

Pennell, F.W. 1935. The Scrophulariaceae of eastern temperate North America Acad. Nat. Sci. Philadelphia Monogr. 1:i-xv, 1-650.

Pennell, F.W. 1938. What is Commelina communis? Proc. Acad. Nat. Sci. Philadelphia 90:31-39.

Pennell, F.W. 1946. Reconsideration of the Bacopa-Herpestis problem of the Scrophulariaceae Proc. Acad. Nat. Sci. Philadelphia 98:83-98.

Pennington, T. D. 1990. Sapotaceae. Flora Neotropica. Monograph 52:1-770.

Pennington, T.D. 1991. The genera of Sapotaceae Royal Botanic Gardens, Kew, England, U.K. and New York Bot. Garden, Bronx.

Perdue, R.E., Jr. 1957. Synopsis of Rudbeckia subgenus Rudbeckia Rhodora 59:293-299.

Perry, G. and J. McNeill. 1986. The nomenclature of Eragrostis cilianensis (Poaceae) and the contribution of Bellardi to Allioni's Flora Pedemontana. Taxon 35: 696-701.

Perry, J.D. 1971. Biosystematic studies in the North American genus Sabatia (Gentianaceae) Rhodora 73:309-369.

Perry, L.M. 1933. A revision of the North American species of Verbena Ann. Missouri Bot. Gard. 20:239-362.

Perry, L.M. 1935. Evolvulus pilosus an invalid name Rhodora 37:63.

Perry, L.M. 1937. Notes on Silphium Rhodora 39:281-297.

Peterson, C. D. and L. E. Brown. 1983. Vascular Flora of the Little Thicket Nature Sanctuary San Jacinto County, Texas. Outdoor Nature Club, Houston, TX.

Peterson, K. M. and W. W. Payne. 1973. The genus Hymenoclea (Compositae: Ambrosieae). Brittonia 25:243-256.

Peterson, K.A., W.J. Elisens, and J.R. Estes. 1990. Allozyme variation in Pyrrhopappus multicaulis and P. carolinianus (Asteraceae): Relation to mating system and purported hybridization Syst. Bot, 15:534-543.

Peterson, P. M. and C. R. Annable. 1990. A revision of Bleharoneuron (Poaceae: Eragrostideae). Systematic Botany 15(4):515-525.

Peterson, P. M. and C. R. Annable. 1991. Systematics of the annual species of Muhlenbergia (Poaceae-Eragrostideae). Systematic Botany Monograph, Vol. 31.

Peterson, P.M. and R.D. Webster. (forthcoming). Gould's grass systematics Texas A&M Univ. Press, College Station.

Peterson, P.M., R.D. Webster, and J. Valdes-Reyna. 1997. Genera of New World Eragrostideae (Poaceae: Chloridoideae) Smithsonian Institution Press, Washington, D.C.

Peterson, R.E. 1995. Regional climate of Northwest and North Central Texas. In: J. Norwine, J.R. Giardino, G.R. North, J.B. Valdés, eds The changing climate of Texas: Predictability and implications for the future, Chapter 10 Pp. 92-121, GeoBooks, Texas A&M Univ., College Station.

Pfeifer, H. W. 1966. Revision of the North and Central American hexandrous species of Aristolochia (Aristolochiaceae). Annals of the Missouri Botanical Garden 53:115-196.

Pfeifer, H. W. 1970. A taxonomic revision of the pentandrous species of Aristolochia. The University of Connecticut Publication Series. CT.

Pfeifer, N. E. 1922. Monograph of the Isoëtaceae. Annals of the Missouri Botanical Garden 9:79-232.

Phelan, R. 1976. Texas wild, the land, plants, and animals of the Lone Star state Bookthrift, New York.

Philbrick, C.T. 1991. Hydrophily: Phylogenetic and evolutionary considerations Rhodora 93:36-50.

Philbrick, C.T. 1993. Underwater cross-pollination in Callitriche hermaphroditica (Callitrichaceae): Evidence from randomly amplified polymorphic DNA markers Amer. J. Bot. 80:391-394.

Philbrick, C.T. and G.J. Anderson. 1992. Pollination biology in the Callitrichaceae Syst. Bot. 17:282-292.

Philbrick, C.T. and J.M. Osborn. 1994. Exine reduction in underwater flowering Callitriche (Callitrichaceae): Implications for the evolution of hypohydrophily Rhodora 96:370-381.

Philbrick, C.T. and R.K. Jansen. 1991. Phylogenetic studies of North American Callitriche (Callitrichaceae) using Chloroplast DNA restriction fragment analysis Syst. Bot. 16:478-491.

Phillips, R. C., C. McMillan, H. R. Bittaker, and R. Heiser 1974. Halodule wrightii Ascherson in the Gulf of México. Marine Science 18:257-261.

Phipps, J. B. 1988. Crataegus (Maloideae, Rosaceae) of the southeastern United States, I. Introduction and Series aestivales. Journal of the Arnold Arboretum 69(4):401-431.

Phipps, J. B. 1990. Crataegus secreta (Rosaceae), a new species of hawthorn from the Edwards Plateau, Texas. Sida 14(1):13-19.

Phipps, J. B. 1997. Monograph of Northern Mexican Crataegus (Rosaceae, Subfam. Maloideae). Sida, Botanical Miscellany No. 15.

Phipps, J. B. 1999. The relationships of the American black-fruited hawthorns Crataegus erythropoda, C. rivularis, C. saligna, and C. brachyacantha to C. Ser. Douglasianae (Rosaceae). Sida 18(3): 647-660.

Phipps, J. B. and R. J. O'Kennon. 1997. Crataegus nananixonii (Rosaceae, Ser. Intricatae) a new species of hawthorn from Eastern Texas. Sida 17(3): 569-574.

Phipps, J.B. 1983. Biogeographic, taxonomic, and cladistic relationships between east Asiatic and North American Crataegus Ann. Missouri Bot. Gard. 70:667-700.

Phipps, J.B. and M. Muniyamma. 1980. A taxonomic revision of Crataegus (Rosaceae) in Ontario. Canad. J. Bot. 58: 1621-1699.

Phipps, J.B., K.R. Robertson, J.R. Rohrer, and P.G. Smith. 1991. Origins and evolution of subfam. Maloideae (Rosaceae) Syst. Bot. 303-332.

Phipps, J.B., K.R. Robertson, P.G. Smith, and J.R. Rohrer. 1990. A checklist of the subfamily Maloideae (Rosaceae) Canad. J. Bot. 68:2209-2269.

Pickens, M.A. 1997. Benny Simpson's legacy to NPSOT Sida 17:852-853, Originally published 1997 in Native Pl. Soc. Texas News 15(2):2.

Piehl, M.A. 1962. The parasitic behavior of Dasistoma macrophylla Rhodora 64:331-336.

Piehl, M.A. 1963. Mode of attachment, haustorium structure, and hosts of Pedicularis canadensis Amer. J. Bot. 50:978-985.

Piehl, M.A. 1965. The natural history and taxonomy of Comandra (Santalaceae) Mem. Torrey Bot. Club 22:1-97.

Pielou, E.C. 1988. The world of northern evergreens Comstock Publishing Associates, a division of Cornell Univ. Press, Ithaca, NY.

Pietropaolo, J. and P. Pietropaolo. 1986. Carnivorous plants of the world Timber Press, Portland, OR.

Pilbeam, J. 1981. Mammillaria, A Collector's Guide. Universe Books, New York.

Pilger, R. 1931. Benerkungen zu Panicum und verwandten Gattungen. Notizblatt des Königlichen botanischen Gartens und Museums zu Berlin 11:246.

Pilz, G. E. 1978. Systematics of Mirabilis subgenus Quamoclidion (Nyctaginaceae). Madroño 25:113-132.

Pimenov, M.G. and M.V. Leonov. 1993. The genera of the Umbelliferae Royal Botanic Gardens, Kew, England, U.K.

Ping-Sheng, H., S. Kurita, Yuzhi-Zhou, and L. Jin-Zhen. 1994. Synopsis of the genus Lycoris (Amaryllidaceae). Sida 16(2):301-331.

Pinkava, D. J. and B. D. Parfitt. 1988. Nomenclatural changes in Chihuahuan Desert Opuntia (Cactaceae). Sida 13(2):125-130.

Pinkava, D. J., B. D. Parfitt, M. A. Baker, and R. D. Worthington. No Date. Chromosome numbers in some cacti of western North America--VI, with nomenclatural changes. Madroño 39(2):98-113.

Pinkava, D.J. 1967. Biosystematic study of Berlandiera (Compositae) Brittonia 19:285-298.

Pinson, Jr., J. N. and W. T. Batson. 1971. The status of Muhlenbergia filipes Curtis (Poaceae). Journal of the Elisha Mitchell Scientific Society 87:188-191.

Piper, C.V. 1906. North American species of Festuca Contr. U.S. Natl. Herb. 10:1-48.

Piper, C.V. and K.S. Bort. 1915. The early agricultural history of timothy J. Amer. Soc. Agron. 7:1-14.

Pippen, R. W. 1978. CacaliaD1167. North American Flora. II. 10:151-159.

Pitman, WD; Redfearn, DD; Read, JC 2000. Response of Texas bluegrass to season of nitrogen fertilization on the Louisiana Coastal Plain Journal of Plant Nutrition, 23 (4) pp. 423-429, 2000

Platt, S.G. and C.G. Brantley. 1997. Canebrakes: An ecological and historical perspective Castanea 62:8-21

Plumb, G. A. No Date. Vegetation classifications of Big Bend National Park, Texas. Texas Academy of Science 44(4):375-387.

Plunkett, G.M., D.E. Soltis, and P.S. Soltis. 1996 [1997]. Evolutionary patterns in Apiaceae: Inferences based on matK sequence data Syst. Bot. 21:477-495.

Pogan, E. 1963. Taxonomical value of Alisma trivale Pursh and Alisma subcordatum Raf Canad. J. Bot. 41:1011-1013.

Pohl, R. W. 1972. New taxa of Hierochloë, Pariana, and Triplasis from Costa Rica. Iowa State Journal of Research 47(1):71-78.

Pohl, R. W. 1980. Gramineae. In. Burger (ed.). Flora Costaricensis, Family # 15 W. Fieldiana: Botany, new series, No. 4. Field Museum of Natural History, Chicago, IL.

Pohl, R.W. 1951. The genus Setaria in Iowa Iowa State Coll. J. Sci. 25:501-508.

Pohl, R.W. 1959. Morphology and cytology of some hybrids between Elymus canadensis and E. virginicus Proc. Iowa Acad. Sci. 66:155-159.

Pohl, R.W. 1962. Notes of Setaria viridis and S. faberi (Gramineae) Brittonia 14:210-213.

Pohl, R.W. 1969. Muhlenbergia, subgenus Muhlenbergia (Gramineae) in North America Amer. Midl. Naturalist 82:512-542.

Polhill, R.M. and P.H. Raven, eds. 1981. Advances in legume systematics Vols. 1, 2, Proc. Intern. Legume Conference, Kew, England, U.K.

Pool, W.C. 1964. Bosque territory: A history of an agrarian community Chaparral Press, Kyle, Texas.

Poole, M.M. and D.R. Hunt. 1980. Pollen morphology and the taxonomy of the Commelinaceae: An exploratory survey American Commelinaceae: VIII, Kew Bull. 34:639-660.

Porter, C.L. 1967. Taxonomy of flowering plants, 2nd ed W.H. Freeman and Co., San Francisco, CA.

Porter, D. M. 1969. The genus Kallstroemia. Contributions from the Gray Herbarium of Harvard University 198:1-153.

Porter, D. M. 1974. Disjunct distributions in the New World Zygophyllaceae. Taxon 23:339-346.

Porter, D.M. 1972. The genera of Zygophyllaceae in the southeastern United States J. Arnold Arbor. 53:531-552.

Porter, D.M. 1976. Zanthoxylum (Rutaceae) in North America north of Mexico Brittonia 28:443-447.

Powell, A. M. 1963. An emended description of the monotypic genus Bartlettia A. Gray (Senecioneae) with distributional notes. Southwestern Naturalist 8:117-120.

Powell, A. M. 1967. Novelties in Perityle (Compositae). Sida 3:177-180.

Powell, A. M. 1969. Taxonomy of Perityle section Pappothrix (Compositae-Peritylinae). Rhodora 71:58-93.

Powell, A. M. 1973a. Taxonomy of Perityle section Laphamia (Compositae-Helenieae-Peritylinae). Sida 5:61-128.

Powell, A. M. 1973b. Taxonomy of Pericome (Compositae-Peritylinae). Southwestern Naturalist 18(3):335-339.

Powell, A. M. 1974. Taxonomy of Perityle section Perityle (Compositae-Peritylinae). Rhodora 76(806):229-306.

Powell, A. M. 1978. Systematics of Flaveria (Flaveriinae-Asteraceae). Annals of the Missouri Botanical Garden 65:590-636.

Powell, A. M. 1988. Trees and Shrubs of Trans-Pecos Texas. Big Bend Natural History Association, Incorporated, Big Bend National Park, TX.

Powell, A. M. 1994. Grasses of the Trans-Pecos and Adjacent Areas. University of Texas Press, Austin.

Powell, A. M. 1998. Trees and Shrubs of the Trans-Pecos and Adjacent Areas. University of Texas Press, Austin.

Powell, A. M. and B. L. Turner. 1976. New gypsophilic species of Pseudoclappia and Sartwellia (Asteraceae) from West Texas and eastern Chihuahua. Sida 6:317-320.

Powell, A. M. and B. Wauer. 1990. A new species of Viola (Violaceae) from the Guadalupe Mountains, Trans-Pecos Texas. Sida 14:1-6.

Powell, A. M., A. D. Zimmerman, R. A. Hilsenbeck. 1991. Experimental documentation of natural hybridization in Cactaceae: origin of Lloyd's hedgehog cactus, Echinocereus x lloydii. Plant Systematics and Evolution 178:107-122.

Powell, A. M., S. Powell, and A. S. Tomb. 1977. Cytotypes in Cevallia sinuata (Loasaceae). Southwestern Naturalist 21:433-441.

Powell, A. M.and James F. Weedin 2001. Chromosome numbers in Chihuahuan Desert Cactaceae. III. Trans-Pecos Texas Am. J. Bot. 88: 481-485.

Price, R.A. 1989. The genera of Pinaceae in the southeastern United States J. Arnold Arbor. 70:247-305.

Price, R.A. 1996. Systematics of the Gnetales: A review of morphological and molecular evidence. In: W.E. Friedman (symposium organizer) Biology and evolution of the Gnetales, Int. J. Pl. Sci. 157 (Nov. 1966 suppl.):S40-S49.

Price, R.A. and J.D. Palmer. 1993. Phylogenetic relationships of the Geraniaceae and Geraniales from rbcL sequence comparisons Ann. Missouri Bot. Gard. 80:661-671.

Price, R.A. and J.M. Lowenstein. 1989. An immunological comparision of the Sciadopityaceae, Taxodiaceae, and Cupressaceae Syst. Bot. 14:141-149.

Pringle, J. S. 1971. Taxonomy and distribution of Clematis section Atragene (Ranunculaceae) in North America. Brittonia 23:361-393.

Pringle, J.S. 1997. Clematis. In: Flora of North America Editorial Committee, eds, Fl. North Amer. 3:158-159, 164-176 Oxford Univ. Press, New York and Oxford.

Procher, R.D. 1978. Boerhaavia diffusa L. (B. coccinea Mill.) (Nyctaginaceae) in the Carolinas Castanea 43:172-174.

Proctor, M., P. Yeo, and A. Lack. 1996. The natural history of pollination Timber Press, Portland, OR.

Pruski, J.F. and G.L. Nesom. 1992. Glandularia [X] hybrida (Verbenaceae), a new combination for a common horticultural plant Brittonia 44:494-496.

Puff, C. 1976. The Galium trifidum group (Galium sect. Aparinoides, Rubiaceae). Canadian Journal of Botany 54:1911-1925.

Puff, C. 1977. The Galium obtusum group, Galium sect. Aparinoides, (Rubiaceae). Bulletin of the Torrey Botanical Club 104:202-208.

Puff, C. 1991. Revision of the genus Paederia L. (Rubiaceae-Paederieae) in America. Opera Botanica Belgique 3:325-333.

Pulich, W.M. 1988. The birds of North Central Texas Texas A&M Univ. Press, College Station.

Punt, W. 1962. Pollen morphology of the Euphorbiaceae with special reference to taxonomy Wentia 7:1-116.

Pyrah, G. L. 1969. Taxonomic and distributional studies in Leersia (Gramineae). Iowa State Journal of Science 44(2):215-270.