Can you identify this tree found in northern California?
http://img687.imageshack.us/g/whattreeisthis111.jpg/

These are branches and flowers pulled off of the tree earlier today.

I think it might be a mulbury or hibiscus but can't seem to find the exact
species since nither has those 5 stalks inside of the yellow flower and it
isn't red anywhere.

Does this plant look familiar to you?