Plantain, narrow-leaved.
Pliny, his account of an intermittent spring.
Poets, their intuitive knowledge of nature; inaccuracies and felicities in matters of natural history; their interpretation of nature.
Pogonia, adder's-tongue.
Pokeweed.
Polygala, fringed.
Pond-lily, or sweet-scented water lily.
Pond-lily, yellow.
Poppy, scarlet field.
Porcupine, Canadian.