Orchids make up one of the largest families of flowering plants. As per the current estimates there are about 20,000 orchid species found in almost all regions of the world,but their greatest diversity occurs in the tropical and sub-tropical climates where positive factors for growth - thick vegetation and high humidity prevail.
India has a rich orchid heritage and is recognized the world over as a significant
producer of both wild and hybrid orchids. Over 1,600 species of orchids are found in India which constitutes almost 10 percent of the world orchid flora. Indian orchids include much variety with proven floriculture and/or herbal traits and have reached almost all the famed botanical gardens the world over.
Northeast India sustains the highest concentration with about 700 species. There are 550 species of orchids in Arunachal Pradesh alone - the highest number in any State. One of the rarest and endangered orchids, Blue Vanda, occurs here in Namdapha Reserved National Park
In Arunachal Pradesh orchids occur naturally in diverse habitats. In the rich tropical forests of the Tirap district, clusters of beautiful blue vanda (Vanda coerulea) adorn the trees. Tipi Orchid Research Centre boasts of over 500 species of orchids. Sessa, 24 km from Tipi has an Orchid Sanctuary, which abounds in a variety of species including the white Coelogyne nitida (which grows on moss covered rocks) and the tree borne yellow, Cymbidium elegans and Dendrobium chrysanthum, the bright yellow flowers. The drive from Tipi to Sessa is equally beautiful. Along the roads can be seen species like Dendrobium gibsonii, with its clusters of beautifully formed yellow flowers with rich maroon centres and Dendrobium nobile with white and purple flowers.
Orchids Flower One of the rare, endangered, curious and sought after ground orchids found in Arunachal is the Paphiopedilum species (the Venus or Lady's slipper orchids). There are three species of the genus found in arunachal, viz; I) P. fairrieanum popularly referred to as "Lost Lady's Slipper orchids". (2) P. venustum and (3) P.spicerianum.