Ranunculus californicus

Ranunculus californicus, commonly known as the California buttercup, is a flowering plant of the buttercup family Ranunculaceae. It is a native of California, where it is common in many habitats, including chaparral and woodlands. Its distribution extends across many habitats of California, north into Oregon and south into Baja California. Its reported locations include the islands between British Columbia and Washington, the Channel Islands of California, and the Sierra Nevada....read more on Wikipedia.