H. californica

H. californica may refer to:


 * Hackelia californica, the California stickseed, a flowering plant species native to the mountains of northern California and southern Oregon
 * Helianthella californica, the California helianthella, a flowering plant species native to the mountains of California and Oregon
 * Horkelia californica, the California horkelia, a flowering plant species endemic to California
 * Hulsea californica, the San Diego alpinegold and San Diego sunflower, a rare flowering plant species endemic to southern California

Synonyms

 * Hyalophora californica, a synonym for Hyalophora euryalus, the ceanothus silkmoth, a moth species found from British Columbia to south to Baja California