The Valley of Flowers has gained importance as a region containing a diversity of alpine flora, representative of the Western Himalayan alpine shrub and meadows ecoregion. The rich diversity of species reflects the valley's location within a transition zone between the Zanskar and Great Himalayas ranges to the north and south, respectively, and between the Eastern Himalaya and Western Himalaya flora. A number of plant species are considered threatened. Several have not been recorded outside of Uttarakhand. Two have not been recorded in Nanda Devi National Park. The diversity of threatened species of medicinal plants is higher than has been recorded in other Indian Himalayan protected areas. The entire Nanda Devi Biosphere Reserve lies within the Western Himalayas Endemic Bird Area (EBA). The Valley of Flowers National Park is the second core zone of the Nanda Devi Biosphere Reserve. Seven restricted-range bird species are endemic to this part of the EBA.