Pachyrrhizus – 2 clippings
Paeonia – 2 clippings
Paint – 3 clippings
Paleo Botany – 16 items, including Natural History 1984 “Ancient Flowers for the Faithful”, The Times (London) 1980 “Microbiology: The oldest fossils”.
Palmae 1 – 30 clippings, including The Agricultural News 1906 “The Economic Uses of the Palms”.
Palmae 2 – 26 items, including The Agricultural News 1908 “Palm Trees and Their Uses”.
Pandanus – 3 clippings
Papaveraceae – 1 clipping
Papaver – 11 clippings, including Natural History 1980 “The Versatile Opium Poppy”.
Paper 1 – 38 items, including The Agricultural News 1913 “New Sources of Paper”.
Paper 2 – 14 items, including Natural History 1937 “The Story of Paper”.
Paper 3 – 42 items, including American Forestry 1917 “Forestry and the Paper Industry”.
Paper 4 – 19 items, including The Boston Globe 1925 “The Invention of Writing and Discovery of Metals”.
Paper 5 – 23 items, including The New York Times 1981 “Book Keeping in New York”.
Paper Pulp – 15 clippings, including American Forestry 1920 “Paper pulp from seaweed”.
Parkinsonia – 9 items, including The Times (London) 1982 “Some acid words from mummy”, Harvard Gazette 1979 “Historic records: Legal documents could be oldest from Palestine”.
Parmentiera – 1 clipping
Passiflora – 7 items, including The Agricultural News 1903 “The Bell Apple”.
Paullinia – 18 items
Pea – 4 clippings
Peach – 6 clippings
Peanuts 1 (up to 1930’s) – 31 items
Peanuts 2 (1940’s–1980’s) – 26 items
Pear – 16 items
Peat – 18 items, including Natural History 1982 “Beneath the blanket bogs of Britian”.
Pecan – 7 items
Pedicularis – 1 clipping
Peltostigma – 2 clippings
Penicillin – 7 clippings
Pentadesma – 1 clipping
Pepper – 11 items
Peppermint – 2 items
Perfumes – 34 clippings, including Boston Traveler 1951 “Making, selling perfume grosses 100 Million Yearly”, Clipper 1979 “The World’s Rare Fragrances”.
Periploca – 1 clipping
Persea – 9 clippings, including The Agricultural News 1909 “The Avocado Pear”.
Persimmon – 2 clippings
Pesticides – 14 clippings, including The New York Times 1980 “Turkish Farmers Turn Bitterly From Opium Poppy”.
Peyote – 31 items, including The Florida Times–Union “Vicious Drug Plays Havoc with Navajos”.
Phaseolus – 12 clippings, including The Agricultural News 1905 “Lima Beans”.
Phleum – 1 item
Phoenix – 24 clippings, including Geographical Review 1926 “The Distribution of the Date Palm”.
Phoradendron – 2 clippings
Phormium – 10 clippings, including The Agricultural News 1918 “New Zealand Hemp”.
Photinia – 1 clipping
Physiology – 8 clippings, including Newsweek 1980 “Hormones for Profit”.
Physostigma – 1 clipping
Phytelephas – 6 clippings
Phytolacca – 6 items
Phytochemistry – 4 items
Picea – 10 items, including Natural History 1938 “The Rarest American Spruce”.
Pickles – 3 items
Pilocarpus – 1 item
Pimenta – 5 items
Pinckneya – 3 items
Pine – 13 items
Pineapple – 24 items
Pinus – 41 items, including American Forestry 1917 “The Slash Pine”.
Piper – 17 items, including New York Times 1971 “Betel– “Leaf Chewers in Karachi Joyfully Await a Taste of Peace”.
Pipes – 14 items, including New York Times 1979 advertisement “New – Fashionable Pipes for the Ladies (you need not inhale)”.
Pisonia – 1 item
Pistacia – 7 items
Pisum – 1 item
Pithecolobium – 5 items, including American Forestry 1916 “The Saman or Rain Tree”.
Plant Lore – 15 items, including The New York Times Sunday 1938 “Finds Death Trees, Feared by Indians”.
Plantago – 5 items
Plastics – 3 items
Plantus – 3 items
Plum – 7 items
Podophyllum – 3 items
Pointsettia – 1 item
Poisons 1 (up to 1930’s) – 40 items, including The Garden 1921 “Squills as a Rat Poison”, The Boston Globe 1924 “Two are Killed by Toadstools”.
Poisons 2 – 23 items
Poisons 3 – 17 items, including The New York Times 1983 “The Deepening Mystery of Yellow Rain”.
Pollination – 1 item
Polygala – 2 items
Polygonum – 2 items
Polymnia – 1 item
Pomaderris – 1 item
Pontederia – 2 items
Potato 1 – 34 items, including Science News Letter 1929 “Earliest Description of Potatoes”.
Potato 2 – 35 items, including The New York Times 1938 “Researchers work on sticky potato that traps insects”.
Preservatives – 3 items, including The New York Times Sunday 1978 “Dried Blossoms Will Last Forever”.
Preserves – 6 items, including The Garden Magazine 1916 “The Guava – A Substitute for Gooseberries in Florida”.
Primula – 2 items
Prioria – 1 item
Propagation – 1 item
Prosopis – 11 items, including The New York Times 1982 “Mesquite: Bad Press but Great Flavor”.
Protein – 9 items
Prunus – 24 items
Pseudotsuga – 11 items
Psophocarpus – 13 items, including Life Magazine 1980 “Food for Tomorrow: From odd pods that grow in the tropics to lobsters bred in boxes”.
Pteridium – 6 items
Puccoon – 1 item
Pumpkins – 8 items
Punica – 4 items
Puya – 2 items
Pyrethrum – 4 items
Pyrola – 2 items
Pyrus – 7 items