P. californica

P. californica may refer to:
 * Paeonia californica, the California peony or wild peony, a plant species endemic to southwest California
 * Parnassia californica, the California grass of Parnassus, a flowering plant species native to the mountains of Oregon, California and Nevada
 * Perideridia californica, the California yampah, a flowering plant species endemic to California
 * Phacelia californica, the California phacelia and California scorpionweed, a plant species native to coastal northern California and Oregon
 * Phalaris californica, the California canarygrass, an uncommon grass species native to southern Oregon and northern and central California
 * Phragmatopoma californica, the sandcastle worm, honeycomb worm or honeycomb tube worm, a reef-forming marine polychaete worm species found on the Californian coast, from Sonoma County to northern Baja California
 * Phryganidia californica, the California oakworm or California oak moth, a moth species found along the coasts of California and Oregon
 * Plagiodera californica, a leaf beetle
 * Polioptila californica, the California gnatcatcher, a small insectivorous bird species
 * Polygala californica, the California milkwort, a flowering plant species native to southwestern Oregon and northern and central California
 * Pteronarcys californica, the giant stonefly or salmonfly, an aquatic insect species

Synonyms

 * Phomopsis californica, a synonym for Diaporthe citri, a plant pathogen species
 * Pyrocleptria californica, a synonym for Schinia aurantiaca, a moth species found in North America, including California and Arizona