Bloodroot

Bloodroot. What a name, eh? Sanguinaria canadensis has blood-red sap. (The “root” is actually a rhizome.) The sap has historically been used as a dye and for medicinal purposes. They emerge enveloped by the leaf, then shoot above this protective cloak before opening.
Look for these on sunny days when they offer their pollen to early-spring fliers. At night and on overcast days, the flowers close.