Trillium plants can be divided into two groups: the kind where the flower is on a stem either above the leaves or curving under them (pedicellate) and the kind where the flower arised directly from the leaves with no stem (sessile). These are sessile. They have a lemony fragrance. Lily family. Native to more southern regions, and here, found looking very robust in a woodland garden.
Yellow Trillium (Trillium luteum)