I'm glad that Michelle and Kyle mentioned that you can find Trillium near the side of the road in Occidental. I stopped briefly to take a few pictures on 18 March 2015.
This is Western Trillium or Western Wakerobin (Trillium ovatum). Having spent most of my time at the ocean, I don't have a lot of experience with them. I read that while most are white when they start flowering, they fade to a deep-rose color.
Here are two more examples of flowers that are further along:
"Trillium" refers to the flower parts coming in sets of threes (see below). I wondered about the name "wakerobin." I found a few references online that explained the name derives from the fact that these flowers bloom at the same time that robins are heralding the arrival of spring.
This is a good time of year to see Trilliums — catch them if you can!