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Issue: Vol. 773 No. 3: 9 Sept. 2026
Type: Article
Published: 2026-09-09
DOI: 10.11646/phytotaxa.773.3.7
Page range: 289-295
Abstract views: 33
PDF downloaded: 6

Gastrodia keyiensis (Orchidaceae: Gastrodieae), a new holomycotrophic species from Arunachal Pradesh, Eastern Himalaya, India

G.B.Pant National Institute of Himalayan Environment (GBPNIHE); North-East Regional Centre; Chandranagar; Itanagar (791113); Arunachal Pradesh; India; Taxonomy and Biodiversity Laboratory; Department of Botany; Sikkim University; 6th mile; Samdur; Gangtok; Sikkim (737102); India
Department of Botany; Kaliabor College; Nagaon‒782137; Assam; India
Central National Herbarium; Botanical Survey of India; Howrah‒711103; West Bengal; India
All Arunachal Pradesh Students Union; Itanagar‒791111; Arunachal Pradesh; India
Taxonomy and Biodiversity Laboratory; Department of Botany; Sikkim University; 6th mile; Samdur; Gangtok; Sikkim (737102); India
G.B.Pant National Institute of Himalayan Environment (GBPNIHE); North-East Regional Centre; Chandranagar; Itanagar (791113); Arunachal Pradesh; India
Monocots Ghost orchid Mycoheterotroph New to Science Orchid Taxonomy

Abstract

Gastrodia keyiensis M.Khanal, D.Borah & Dev.Kumar sp. nov. is described from Keyi Panyor District, Arunachal Pradesh, northeastern India. The new species is morphologically allied to G. putaoensis but differs in having a broadly obovate basal part of the labellum with 6–7 prominent longitudinally thickened structures, and a distinct, thick, strongly incurved, narrowly oblong-ligulate, yellow apical part that is minutely papillate, with the apex rounded to obtuse (vs. an elliptic basal part with 3–5 parallel thickened lines, and a narrower apical part densely covered with yellow hairs, with the apex obtuse and densely covered with red papillae). A detailed morphological description, diagnosis, photographic illustrations, notes on distribution, habitat, phenology, and conservation status, together with comparisons with morphologically allied species, are provided to facilitate its identification.

References

  1. Alexiades, M.N. (1996) Standard techniques for collecting and preparing herbarium specimens. Advances in Economic Botany 10: 99–126.
  2. Bachman, S. & Moat, J. (2012) GeoCAT—an open-source tool for rapid Red List assessments. BGjournal 9 (1): 11–13.
  3. Beentje, H. (2010) The Kew Plant Glossary: an Illustrated Dictionary of Plant Terms. Kew Royal Botanic Gardens, Kew, 164 pp. https://doi.org/10.1111/j.1095-8339.2010.01099.x
  4. Brown, R. (1810) Gastrodia. Prodromus Florae Novae Hollandiae et Insulae van-Diemen. Holland. London, 446 pp. https://doi.org/10.5962/bhl.title.6720
  5. Chen, S.C., Gale, S.W. & Cribb, P.J. (2009) Gastrodia. In: Wu, Z.Y., Raven, P.H. & Hong, D.Y. (Eds.) Flora of China, vol. 25. Science Press & Missouri Botanical Garden Press, Beijing & St. Louis, pp. 201–205.
  6. Chowlu, K., Tsering, J., Ray, A., Rao, A.N., Pertin, A., Dash, S.S. & Kabeer, A. (2025) Gastrodia lohitensis sp. nov. (Orchidaceae, Epidendroideae) from India. Nordic Journal of Botany 2025 (1): e04556. https://doi.org/10.1111/njb.04556
  7. Chowlu, K., Tsering, J., Shenoy, A., Ray, A. & Kabeer, K.A.A. (2026) Gastrodia huapingensis (Orchidaceae, Epidendroideae): a new addition to the flora of India. National Academy Science Letters. https://doi.org/10.1007/s40009-026-02024-x
  8. Cribb, P., Fischer, E. & Killmann, D. (2010) A revision of Gastrodia (Orchidaceae: Epidendroideae, Gastrodieae) in tropical Africa. Kew Bulletin 65 (2): 315–321. https://doi.org/10.1007/s12225-010-9193-4
  9. Hegde, S.N. & Rao, A.N. (1985) Gastrodia arunachalensis Hegde et A.N. Rao—a new orchid from Arunachal Pradesh. Orchid Review 93: 171–172.
  10. Hooker, J.D. (1890) The Flora of British India, 6. L. Reeve & Co., London, pp. 122–123.
  11. IUCN Standards and Petitions Committee (2024) Guidelines for Using the IUCN Red List Categories and Criteria. Version 16. Prepared by the Standards and Petitions Committee. International Union for Conservation of Nature, Gland, Switzerland. Available from: https://www.iucnredlist.org/resources/redlistguidelines (accessed 28 June 2026)
  12. King, G. & Pantling, R. (1898) The Orchids of Sikkim Himalaya. Annals of the Royal Botanic Garden, Calcutta 8: 259–260.
  13. Khanal, M., Rai, S.K., Kumar, D., Chettri, A. & Sarkar, S. (2023) Gastrodia bambu (Orchidaceae: Epidendroideae), a New Addition to the Orchid Flora of India with Unique Additional Characterization and Red List Assessment. Journal of Japanese Botany 98 (6): 329–336. https://doi.org/10.51033/jjapbot.ID0181
  14. Khanal, M., Sarkar, S., Rai, S.K., Kumar, D., Rawat, S., Rai, P. & Agrawala, D.K. (2024a) Gastrodia sikkimensis (Orchidaceae: Gastrodieae), a new holomycotrophic species from Sikkim, India. Phytotaxa 635 (2): 157–164. https://doi.org/10.11646/phytotaxa.635.2.5
  15. Khanal, M., Sarkar, S., Sarkar, K., Chhetri, P., Rai, S.K., Kumar, D. & Rawat, S. (2024b) Gastrodia indica (Orchidaceae: Gastrodieae), a new completely cleistogamous holomycotrophic species from India. Phytotaxa 663 (1): 26–32. https://doi.org/10.11646/phytotaxa.663.1.3
  16. Metusala, D. & Supriatna, J. (2017) Gastrodia bambu (Orchidaceae: Epidendroideae), a new species from Java, Indonesia. Phytotaxa 317 (3): 211–218. https://doi.org/10.11646/phytotaxa.317.3.5
  17. POWO (2026) Plants of the World Online. Facilitated by the Royal Botanic Gardens, Kew. Available from: https://powo.science.kew.org/ (accessed 28 June 2026)
  18. Pridgeon, A.M., Cribb, P.J., Chase, M.W. & Rasmussen, F.N. (2005) Genera Orchidacearum 4, Epidendroideae (part one). Oxford University Press, Oxford, UK, pp. 444–448. https://doi.org/10.1093/oso/9780198507123.001.0001
  19. Qin, Y., Huang, S.Q., Wang, B.M. & Liu, Y. (2024) Gastrodia daweishanensis (Orchidaceae), a new species from Yunnan, China. Taiwania 69 (3): 317–320.
  20. Rao, A.N., Haridasan, K. & Hegde, S.N. (1991) A new species of Gastrodia from Arunachal Pradesh, India. Arunachal Forest News 9 (1): 10–12.
  21. Sarkar, K., Khanal, M., Sarkar, S., Rai, S.K., Ashraf, S.A.H., Sariga, K.S., Bora, D. & Sen, A. (2025) Gastrodia flavilabella SS Ying (Orchidaceae: Gastrodieae), a New Addition to the Flora of India With Unique Characteristics and Red List Assessment. Feddes Repertorium 136 (4): 287–294. https://doi.org/10.1002/fedr.202400035
  22. Sarkar, S., Khanal, M., Sarkar, K. & Rao, A.N. (2026) Resolving ambiguities related to the identification of Gastrodia arunachalensis S.N. Hedge & A.N. Rao (Orchidaceae) from India. Adansonia. [in press, accepted on 23 March 2026]
  23. Seidenfaden, G. & Wood, J.J. (1992) The orchids of Peninsular Malaysia and Singapore. Olsen and Olsen, Fredensborg.
  24. Singh, S.K., Agrawala, D.K., Jalal, J.S., Dash, S.S., Mao, A.A. & Singh, P. (2019) Orchids of India, a Pictorial Guide. Botanical Survey of India, Kolkata.
  25. Suetsugu, K. (2019) Gastrodia amamiana (Orchidaceae; Epidendroideae; Gastrodieae), a new completely cleistogamous species from Japan. Phytotaxa 413 (3): 225–230. https://doi.org/10.11646/phytotaxa.413.3.3
  26. Suetsugu, K., Hsu, T.C. & Kaneko, S. (2018) New natural hybrid in the genus Gastrodia: Gastrodia×nippo-uraiensis (Orchidaceae) from Yakushima Island, Japan. Taiwania 63 (3): 220–226. https://doi.org/10.6165/tai.2018.63.220
  27. Jin, X.H. & Kyaw, M. (2017) Gastrodia putaoensis sp. nov. (Orchidaceae, epidendroideae) from north Myanmar. Nordic Journal of Botany 35 (6): 730–732. https://doi.org/10.1111/njb.01581

How to Cite

Khanal, M., Borah, D., Sarkar, S., Gap, N., Rai, S.K. & Kumar, D. (2026) Gastrodia keyiensis (Orchidaceae: Gastrodieae), a new holomycotrophic species from Arunachal Pradesh, Eastern Himalaya, India. Phytotaxa 773 (3): 289–295. https://doi.org/10.11646/phytotaxa.773.3.7