Kellogg's Yampah

The other option might be California yampah...very similar grows in the same region: http://en.wikipedia.org/wiki/Perideridia_californica http://www.coepark.org/wildflowers/white/perideridia-californica.html

I think I got it. I think the spotting is Kellogg's yampah which is very common in the Sierra Nevada foothills. Very similar looking to Queen Anne's lace and is considered a type of wild carrot but has a more similar structure to what you are looking at here. See the link to this photo: http://www.coepark.org/wildflowers/white/perideridia-kelloggii.html

Could also be cow parsnip or western water hemlock? Or it might something planted not natural to the area? Can you give some background on the environment in which you found it? Was it wet, dry, rocky, sandy, soil?

Actually I don't think it is, although the flowers appear the same the way they branch out is very different from Queen Anne's lace.