While I regularly see CA quail during hikes, I have only a handful of crappy pics. It helped for the photo above that this male quail is probably accustomed to lots of human traffic and was standing watch over its family in a prominent spot. Judging by the amount of poo dripped down the sign, this male quail uses this dump station perch regularly.
At last, I found a native jimson weed. Perhaps the reason why I haven't noticed this before is because it blooms in the evening through to the next morning. Unless I'm camping, I usually don't hike in the evenings. Descriptions of its scent range from "sweetly fragrant" flowers to "rank smelling" foliage. Like it's non-native cousin D. stramonium that I've seen at Fort Ord, extracts are narcotic. Native Americans used preparations in ceremonies.