April 29, Mt. Holyoke lower slope, Skinner Park, Hadley
There are 5 pale greenish petaloid sepals, 5 white petals, 5 stamens with x-shaped anthers alternating with 5 lobes of nectar disk, and a single pistil. Stamen filaments in this flower slightly longer than petals (generally they can be equal or somewhat longer than petals).