In this case, it's native Jimsonweed (Datura wrightii). It comes up in the same spot at the mouth of Red Car Canyon.
Wiki says all parts of the plant are toxic, while CalFlora makes no mention of toxicity.
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.
