Yellow Lady Slipper
(Cypripedium Calceous) – found in Missouri (extremely rare), in moist, shady, and acidic areas. This one from ROLF. Can be found, frequently, where Jack in the Pulpits are found. Does well in pine mixed woods due to the acidity of the pine needles. If you spot one or a whole patch, it is best to enjoy it/them and to keep them secret.