Wood anemone
This is one of my favorite flowers, the Wood Anemone. It's incredibly common, and it's quite small: a carpet of groups of five, deep green, toothed leaves from which, for a couple of weeks in early to mid-May, emerge these absolutely lovely five-petaled, off-white flowers. Sometimes, the anemone grows solo; sometimes, it puts forth an entire symphony of leaves and blossoms. I love the plant for its simplicity and its reliability. The last trait makes it a touchstone of spring. When I spot the first Anemone quinquefolia coming up, either in a section of my lawn that I've reserved for the plant or throughout the woods, I know I can start to put my faith in the season. The anemone season is upon us. I'm now a believer.