Leave it there, definitely not weed. Wait until blooming. Foliage plus flowers will provide you more information for the identification of plant. Sweet voilet and doronicum (Leopard's bane) all be possible.
-kindcat(倔猫);
2009-5-28(#5296609@0)
"While it is a popular belief that it is illegal to pick the common Trillium grandiflorum (white trillium) in Ontario, in reality no such law actually exists. However, the rare Trillium flexipes (drooping trillium) is protected by law in Ontario [1], because of its very small Canadian population."