Orchid flower. Close-up of the inside of the pouch of the pink mocassin (Cypripedium acaule). The leaf-shaped structure at centre left is the anther cap. The surrounding structure (only partially seen) is the lip, a specialised petal that guides the pollinator towards the anthers and the other reproductive parts. The pink mocassin orchid is a terrestrial orchid (growing in the soil), and it is found growing in woodlands and swampland in the temperate regions of North America. There are more than 30,000 species of orchids worldwide.