Photo: Diane Edwardson, May 28, 2012. Jimsonweed (Datura wrightii) is blooming throughout the hills. (Click on photo to enlarge.)
Jimsonweed is native, attracts really big moths and is a hallucinogenic. According to Wikipedia, it's poisonous.
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.