Caltha palustris: flowers

Caltha palustris, known in English as "marsh marigold" or "kingcup", and in French as caltha de marais, souci d'eau, souci de marais, or populage de marais, is a perennial native to temperate regions of the northern hemisphere.

It's been decades since I've seen marsh marigold in real life. I was thrilled to see these gorgeous flowers at Wilket Creek Park.