P. glaucus

P. glaucus may refer to:
 * Papilio glaucus, the Eastern tiger swallowtail, a butterfly species native to North America
 * Phyllobius glaucus, a weevil species found across Europe
 * Phyllocladus glaucus, now Phyllocladus aspleniifolius, the celery-top pine
 * Pluteus glaucus, a medicinal mushroom
 * Pseudomys glaucus, the blue-gray mouse