Marsh Marigolds
Marsh marigolds, a beautiful yellow wildflower, are found in the early spring in wet areas. Two of these photos were taken on the Lake Bemidji State Park Bogwalk. The third was taken roadside in a swampy area with standing water.
Sometimes they are referred to as cowslips. They are not related (in the same plant family) to the annual marigold many of us plant in our gardens.
Bees love them.
Pinetree Photo's Nature Discovery Blog 
Nice sets of 3. I like the bee a lot. Good shot.