| Noun | 1. | Cypripedium calceolus - maroon to purple-brown orchid with yellow lip; Europe, North America and Japanladies' slipper, lady's slipper, lady-slipper, slipper orchid - any of several chiefly American wildflowers having an inflated pouchlike lip; difficult or impossible to cultivate in the garden Cypripedium calceolus pubescens, large yellow lady's slipper - plant of eastern and central North America having slightly fragrant purple-marked greenish-yellow flowers |