Yellow & Purple Lady Slippers flower

Cypripedium calceolus 

  It is a lady's-slipper orchid, and the type species of the genus Cypripedium. It is typically found in open woodland on moist calcareous soils. In continental Europe it is also found growing in the decomposed humus of semi-shaded woodland cover on limestone. 

It has declined over much of the European part of its range, and as a result is legally protected in a number of countries. While the virtual extinction of the lady's-slipper orchid from its historical range in Britain is often blamed on uprooting by gardeners and botanists, it is also the case that its preferred habitat shrank markedly with human clearance of woodland from the limestone landscape, and the grazing of sheep will have finished it off. 

It became a protected species in the UK in 1975 under the Conservation of Wild Creatures and Wild Plants Act, but a reintroduction programme for the lady’s-slipper orchid is in place, and has led to a population of hundreds of plants as of 2003.

Sources : Wikipedia & Google Images