Photo: Diane Edwardson, June 6, 2012. Native Blue Elderberries (Sambucus mexicana) are both in bloom & fruit throughout the neighborhood, including under the 2 Freeway on Rosebud Ave. (Click on photo to enlarge.)
According to CalFlora, citing the California Poison Control System, the plant is majorly toxic but the ripe fruit is not. Eat at your own risk.
Disclaimer: The Corralitas Red Car Property Blog prefers to quote reliable sources, such as CalFlora and California Poison Control, on the issue of toxicity. We often get email suggesting some plants are edible. If you are eating your way through the Red Car Property, we DO NOT recommend you eat any plant you find in the Red Car Property neighborhood without first doing your own research.