Formerly Rhamnus californica.
The seeds inside the berries are supposed to look like coffee beans, but they are, in fact, powerful laxatives and should only be consumed in extremely small quantities if at all.
This bush is a great favorite of bees which seem to swarm to its open flowers. Seen blooming on Blue Canyon trail and on the back side of Arroyo Burro trail mid through late June.
Large bush, often 10 feet tall. Smooth unlobed leaves, alternate. Flowers have 5 petals and appear to have 5 stamens alternating with the petals.