These photos are of a bush in our back yard. We live in Healdsburg California which is in Sonoma County. This bush is about 10 ft. in diameter and 5 ft. tall. It drops its leaves in the fall after turning many colors of red, orange and yellow. There are little berries that can be seen in some of the photos. I think that there are blossoms in the spring but can't remember. This bush has been something pretty until now when I have a serious case of poison oak. My doctor thinks that I got it from our cats. We have no poison oak anywhere on our property but after paying very close attention to the 3 leaf formation of this plant I am wondering. My husband has taken a sample to our local nursery but two or three people have said it is not poison oak. Help!!! I took these photos and you have my permission to use.