The Himalayan mountain wall stretching for about 5000 kms has many peaks in ts range including the Mt.EVEREST the tallest peak in the world. The climate in the mountain tracts is mainly influenced by altittude and comprises of alpine ,temperate and tropical vegatation depending on the Elevation.It has a charecteristic and unique vegatation comprising of Pine, deodars, rhododendrons, birches to name a few.
The region has about 876 species in 151 genera.The genera Aorchis, Bulleyia, Cleisocentron, Cryptochilus, Dickasonia, Didiciea, Diphylax, Diplomeris, Eriodes, Esmeralda, Evrardianthe, Risleya and stigmatodactylus extend also to the neighbouring zones and countries.In the Alpine zone Amitostigma, Aorchis, Cypripedium, Herminium, Didiciea, Cephalanthera, Epipactis, etc are found.Temperate Zone has Corybas himalaicus, Pleione humilus, P.hookerana, P.praecox, Satyrium napalense, Spiranthus Sinensis, etc. The sub tropical zone has many species including Anectochilus, Eulophia, Galeola, etc.. The tropical zone houses Phalenopsis, Eria, Oberonia, Vanda, Dendrobium, Flickingeria, Calanthe, Habenaria... to name a few.
Acrochaene and Jejosephia are the only two endemic genera.Cleisocentron is a small genus of three species found in the Eastern Himalayas, extending up to peninsular Malaysia.Dickasonia has only one species, D.vernicosa reported from Burma.There are a total of 195 species that are endemic to the region with Sikkim and Arunachal pradesh recording the maximum number of orchid species.
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