They are wild and native to eastern and midwest North America. Poppies produce latex, and in Celandine Poppies, it’s a bright yellow sap that was used as a dye by Native Americans.
Wood Poppy, Celandine Poppy (Stylophorum diphyllum)
I’ve seen this growing several places including a big stand at the Arboretum. There’s a flower I recorded earlier called Wood Poppy or Celandine Poppy — this one is weedier looking. Family: Poppy. Origin: Europe.
Celandine (Chelidonium majus)