Probably Trillium, but could also be Paris. Here's a good Trilliaceae site that I came across that has some species identification guides: http://www.goldsword.com/sfarmer/Trillium/
Of the three Trilliums, found in B.C., Trillium ovatum, is by far the most commonly seen. Wear gloves if you ever have to move it, the rhizome, can cause mild blistering of the skin.