This is not the prettiest wildflower. And I'm surprised to find it called Snakeroot on this site. My Pojar field guide calls it Pacific Sanicle, a very odd name for a flower.
I was calling this bipinnatifida. Thanks for not making fun of me, anonymous botanist.
growing profusely in semishade beneath live oak and black oak on oak savannah habitat
hosting a spittle bug of some kind
aka Pacific Sanicle
Sanicula is a genus of plants in family Apiaceae (or Umbelliferae), the same family to which the carrot and parsnip belong. This genus has about 40 species worldwide, with 22 in North America. The common names usually include the label sanicle or black snakeroot.