3rd ranker in most beautiful and rarest flower list is

Yellow and purple lady slippers

It is the rare member of orchid family located mainly in London and other areas of Europe. It is very rare to find out the combination of yellow and purple lady slippers.The yellow lady slipper can see in major part of flower, almost 3/4th of total flower and also the remaining part is in purple color. As it is very rare and features incredible beauty yellow and purple lady slippers is very expensive in the market. So that Yellow and purple lady slipper is protected by law in London.