Also called wood poppy. 

In 🇨🇦 🇺🇸 North America, do not confuse with very-similar-named (and very-similar-looking!) greater celandine poppy  Chelidonium majus.   Although members of separate genera, both are part of poppy  family Papaveraceae.

And do not confuse either with very-similar-named lesser celandine or fig buttercup  Ficaria verna.   Although together the three species are members of two separate families, all three are part of barberry/​buttercup/​poppy  order Ranunculales.

Native to central and eastern 🇨🇦 🇺🇸 Canada and USA.   🗺 Map by county (🇺🇸 USA-48) (color key).

Uses by native peoples
(Ethnobotany database)

Learn more about celandine poppy Stylophorum diphyllum

🔍︎ 🔍︎ images Discover Life Encyclopedia of Life Michigan Flora (Minnesota) Wildflower Garden Missouri Botanical Garden Missouri Plants Native Plant Trust Flora of North America USDA PLANTS db Wikipedia