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Some of the orchids you may come across :

  Hemipilia cordifolia
Place : Thimphu, Gasa
Altitude : 2500 - 2900 m
Season : Jul-Sep

  Herminium josephi
Place : Thimphu, Gasa, Bumthang & Trashiyangtse
Altitude : 2800 - 4500 m
Season : Jun-Sep
  Neottianthe cucullata
Place : Paro, Thimphu, Gasa, Trashiyangtse
Altitude : 2740 - 4750 m
Season : Aug-Sep
  Platanthera clavigera
Place : Thimphu, Gasa, Trongsa, Zhemgang, Bumthang, Lhuntse
Altitude : 1520 - 3900 m
Season : Jul-Oct
  Satyrium nepalense
Place : Thimphu, Punakha, Wangdue, Bumthang, Trashiyangtse
Altitude : 1500 - 3720 m
Season : Aug-Oct
  Liparis cordifolia
Place : Punakha, Sarpang, Trashiyangtse
Altitude : 1000 - 2000 m
Season : Sep-Nov
  Liparis odorata
Place : Chukha, Thimphu, Punakha & Wangdue
Altitude : 900 - 2000 m
Season : May-Sep
  Liparis bootanensis (Griffith)
Place : Thimphu, Punakha, Wangdue & Samdrup Jongkhar
Altitude : 1450 - 2100 m
Season : Jun-Sep
  Oberonia acaulis (Griffith)
Place : Thimphu, Punakha, Wangdue, Sarpang, Trashigang
Altitude : 1000 - 1750 m
Season : Sep-Dec
  Eulophia Zollingeri
Place : Punakha, Wangdue & Trongsa
Altitude : 700 - 1450 m
Season : Apr-May
  Geodorum densiflorum
Place : Punakha, Wangdue, Trongsa
Altitude : 700 - 1450 m
Season : Apr-May
  Cymbidium aloifolium
Place : Chukha, Sarpang, Samtse, Samdrup Jongkhar, Wangdue, Tsirang & Dagana
Altitude : 350 - 2000 m
Season : Apr-Jul
  Cymbidium dayanum
Place : Zhemgang & Mongar
Altitude : 500 - 2230 m
Season : Aug-Sep
  Cymbidium hookerianum
Place : Thimphu, Punakha, Wangdue, Trongsa
Altitude : 1660 - 2500 m
Season : Feb-May
  Cymbidium longifolium
Place : Chukha, Punakha, Trongsa, Zhemgang, Mongar, Trashigang, Lhuntse & Samdrup Jongkhar
Altitude : 1000 - 2500 m
Season : Sep-Dec
  Cymbidium Lancifolium
Place : Paro, Thimphu, Gasa, Trashiyangtse
Altitude : 2740 - 4750 m
Season : Aug-Sep
  Anthogonium gracile
Place : Chukha, Thimphu, Punakha, Wangdue, Trongsa, Zhemgang, Bumthang, Mongar, Trashigang
Altitude : 1300 - 3000 m
Season : Jun-Oct
  Calanthe triplicata
Place : Punaka, Wangdue, Trongsa, Zhemgang, Mongar, Trashigang
Altitude : 700 - 2000 m
Season : Apr-Jul
  Phaius flavus
Place : Gasa, Punakha, Trongsa, Zhemgang, Sarpnag, Lhuentse
Altitude : 500 - 2500 m
Season : Jan-Jun
  Arundina graminfolia
Place : Wangdue, Tsirang, Zhemgang, Sarpang, Trongsa, Mongar, Trashigang, Samdrup Jongkhar
Altitude : 300 - 2000 m
Season : Jan-Nov
  Coelogye nitida
Place : Samtse, Chukha, Tsirang, Sarpang, Trongsa, Samdrup Jongkhar
Altitude : 1200 - 2900 m
Season : Jan-Jun
  Pleione praecox
Place : Chukham Thimphu, Gasa, Punakha, Wangdue, Trongsa, Zhemgang, Mongar, Sarpang, Trashiyantse, and Trashigang
Altitude : 1200 - 3400 m
Season : Sep-Dec
  Eria pannea
Place : Chukha, Punakha, Wangdue, Trongsa, Zhemgang
Altitude : 700 - 1400 m
Season : May-Jul
  Dendrobium densiflorum
Place : Chukha, Thimphu, Gasa, Punakha, Wangdue, Trongsa, Zhemgang, Mongar, Sarpang, Trashiyangtse and Trashigang
Altitude : 350 - 2000 m
Season : Mar-Jul
  Dendrobium aphyllum
Place : Chukha, Punakha, Wangdue, Trongsa, Zhemgang, Tsirang, Samtse, Sarpang, Samdrup Jongkhar
Altitude : 300 - 1300 m
Season : Mar-Jun
  Dendrobium chrysanthum
Place : Chukha, Thimphu, Gasa, Punakha, Wangdue, Trongsa, Zhemgang, Mongar, Sarpang, Trashiyangtse, Trashigang
Altitude : 1000 - 2000 m
Season : Jul-Oct
  Dendrobium devoniaum
Place : Chukha, Punakha, Wangdue, Tsirang, Trongsa, Zhemgang, Mongar, Trashigang
Altitude : 300 - 1300 m
Season : Mar-Jun
  Epigenium fusceseens
Place : Thimphu, Punakha, Wangdue, Trongsa, Mongar, Trashigang
Altitude : 1500 - 2800 m
Season : Oct-Nov
  Bulbophyllum reptans
Place : Thimphu, Gasa, Punakha, Wangdue, Tsirang, Trongsa, Zhemgang, Lhuntse, Trashiyangtse, Trashigang and Samdrup Jongkhar
Altitude : 1500 - 2300 m
Season : Oct-Dec or May
 

Bulbophyllum carinflorum
Place : Wangdue and Trashiyangtse
Altitude : 1300 - 2000 m
Season : Jul-Aug
  Aerides multiflorum
Place : Samtse, Chukha, Sarpang and Samdrup Jongkhar
Altitude : 200 - 650 m
Season : Mar-Jun
  Vanda bicolor
Place : Trongsa, Zhemgang, Mongar, Lhuntse, Trashigang, Samdrup Jongkhar
Altitude : 700 - 2000 m
Season : Feb-May