Western trilliums
Jane McGary (Tue, 02 Apr 2013 10:06:16 PDT)

Sorry, I made a mistake in my previous post about western trilliums.
Trillium albidum and T. petiolatum also have sessile flowers. I was
remembering the former incorrectly but just looked at some, and I
haven't seen the latter. The photos Larry Neel sent me, mentioned in
the previous post, also show yellow and white individuals in
populations of ordinarily red-flowered trilliums.

Jane McGary