the lady's slipper, in botany: A genus of the diandria order, belonging to the gynandria clasps of plants; and in the natural method ranking under the 7th order, Orchideae. The nectarium is ventricose, inflated, and hollow. There are three species; of which only one, viz. the calceolus, is a native of Britain. It grows in rough ground in different parts of the island. The other species are natives of America. None of them are easily propagated in gardens, and therefore must be transplanted from those places where they are natives.