Marsh-Marigold (Cowslip)
Caltha palustris

The yellow flowers, about 1-1/2 inch across, occur on branched stems above the leaves, which are kidney-shaped--round with a deep indentation where they join the petiole connecting them to the stem. Leaves are slightly toothed.
1-2 feet, sun - partial sun. In or beside water.
Spring (April-June).
Marsh-Marigold, 17 May 2020.