Seeds from Rosa californica. Rosa californica, the California wildrose, or California rose, is a species of rose native to the U.S. states of California and Oregon and the northern part of Baja California, Mexico. Rosa californica is a bush or thicket-forming shrub with prickly, curving stems. The fragrant flowers may grow singly or in inflorescences of several blooms. Each rose is open-faced and generally flat, with five petals in any shade of pink from almost white to deep magenta. It produces typical rose hips containing yellow seeds. Zones 5 to 10.