Trillium

Another non-threatening three-leaved plant is trillium. Trillium is a genus of spring ephemeral plants, which means that they complete their entire life cycle prior to the summer solstice. Trillium plants sprout a single stem, at the top of which are three large leaves. Above that is a single flower, which may or may not be on its own stem. Some species have mottled leaves, and the flowers can appear in various colors.

I think the dark flowers in this post are Trillium cuneatum, which has a variety of English names.

I think this yellow flower is Trillium luteum.