Olive tree canopy and dropped fruit, pits, and oil stains.

Olive, Olea europaea (Oleaceae), dropped fruit, pits, and dark oily stains on messy sidewalk and street gutter next to weedy, unmowed residential yard. Davis, CA. by JKC.  Credit: Jack Kelly Clark
Olive tree canopy and dropped fruit, pits, and oil stains. Credit: Jack Kelly Clark