Additions to the Flora of Bhutan: New National Records and Range Extensions of Primulaceae and Orchidaceae from Central and Eastern Bhutan
DOI:
https://doi.org/10.21276/pt.2026.v3.i2.7Keywords:
Biodiversity, Conservation, Lhuentse, New records, Sino-HimalayanAbstract
The Sino-Himalayan region is a speciation and diversity hotspot for montane flora, yet many remote alpine and temperate ecosystems remain under-explored. The current study adds significantly to the families Primulaceae and Orchidaceae to improve our knowledge of the floristic richness of Bhutan and its wider biogeographic relationships with neighboring floristic provinces. Floristic surveys were done along temperate and high-altitude gradients in Lhuentse, Trashiyangtse and central Bhutan from 2020 to 2026. The collected materials were morphologically analyzed in detail. Physical specimens were preserved and deposited at the National Herbarium of Bhutan (THIM). For remote or protected populations, virtual validation was conducted using non-invasive macro-photography against digitized global types and national biodiversity datasets. Spatial analysis and preliminary conservation assessments were performed using ArcGIS Pro and GeoCAT following IUCN guidelines. Primula dumicola W.W.Sm. (Primulaceae) and Habenaria lucida Wall. ex Lindl. (Orchidaceae) are reported as new national records for Bhutan. Habenaria lucida adds to the national orchid tally, taking it to 507 species. The morphological study of P. dumicola population in Lhuentse reveals homostyly, a specialized reproductive system for self-pollination. In addition, we report a significant global westward range extension of Liparis sootenzanensis Fukuy. from Southeast Asia and its subsequent eastward distribution record within the country. The alpine stoloniferous Primula flagellaris W.W. Sm. is also confirmed to have a major eastward range extension. These findings effectively bridge critical distribution gaps between the Eastern Himalayas and the Hengduan Mountains, reinforcing a convincing botanical affinity between the flora of Bhutan and southwest China.
References
Richards AJ. Primula. 2nd ed. Timber Press; 2003.
Hu CM, Kelso S. Primulaceae. In: Wu ZY, Raven PH, eds. Flora of China. Vol 15. Science Press; Missouri Botanical Garden Press; 1996:39-189.
Bawri A, Gajurel PR, Paul A, Khan ML. New distributional records of Primula species in Arunachal Pradesh, India. Biosci Discov. 2014;5(1):6-10.
Ward FK. The Sino-Himalayan flora. Proc Linn Soc Lond. 1927;139(1):67-74. https://doi.org/10.1111/j.1095-8312.1927.tb00009.x
Grierson AJC, Long DG. Flora of Bhutan. Vols 1-3. Royal Botanic Garden Edinburgh; 1983-2002.
Wu CY. The Sino-Himalayan flora: its characteristics and origins. Ann Mo Bot Gard. 1988;75(4):1219-1226. https://doi.org/10.2307/2399288
Pearce NR, Cribb PJ. The Orchids of Bhutan. Flora of Bhutan, Vol 3, Part 3. Royal Botanic Garden Edinburgh; Royal Government of Bhutan; 2002.
Gyeltshen P, Rabgay K, Phuentsho, Kumar P. Zeuxine drukyulensis (Orchidaceae), a new jewel orchid from Bhutan Himalaya. Phytotaxa. 2025;690:123-129. https://doi.org/10.11646/phytotaxa.690.1.8
Gyeltshen P, Rabgay K, Sangay K, et al. Additions to the orchid flora of Bhutan IV. Lankesteriana. 2026;26:11-25.
Eveleigh P. Primula World: The Black Mountain (Bhutan) - Primulas and Problems. Primula World. Published April 22, 2026. Accessed April 22, 2026. https://www.primulaworld.com/
Royal Botanic Garden Edinburgh. Herbarium Catalogue. Accessed April 22, 2026. https://data.rbge.org.uk/herb/
Royal Botanic Gardens, Kew. Kew Herbarium Catalogue. Accessed April 22, 2026. http://apps.kew.org/herbcat/
GBIF.org. GBIF Occurrence Download. Accessed April 23, 2026. https://doi.org/10.15468/dl.4xs8qd
International Union for Conservation of Nature (IUCN). IUCN Red List Categories and Criteria: Version 3.1. 2nd ed. IUCN; 2012.
Bachman S, Moat J, Hill AW, de la Torre J, Scott B. Supporting Red List threat assessments with GeoCAT: geospatial conservation assessment tool. ZooKeys. 2011;150:117-126. https://doi.org/10.3897/zookeys.150.2109
International Union for Conservation of Nature (IUCN). Mapping Standards and Data Quality for the IUCN Red List Categories and Criteria. Version 1.16. IUCN; 2018.
Smith WW. New species of Primula. Notes Roy Bot Gard Edinburgh. 1926;15:233-238. https://doi.org/10.24823/nrbge.1926.2331
Smith WW. Some additions to the flora of the Eastern Himalaya. Rec Bot Surv India. 1911;4(5):219-231.
Fukuyama N. Studia Orchidacearum Japonicarum I. Rep Taihoku Bot Gard. 1933;3:81-86.
Averyanov LV, Nguyen KS, Tichy HN, Nguyen PH. New species of Orchidaceae from Vietnam. Wulfenia. 2016;23:85-117.
Chen X, Ormerod P, Wood JJ. Liparis. In: Wu ZY, Raven PH, Hong DY, eds. Flora of China. Vol 25. Orchidaceae. Science Press; Missouri Botanical Garden Press; 2009:211-228.
Lindley J. The Genera and Species of Orchidaceous Plants. Ridgways; 1830-1840. https://doi.org/10.5962/bhl.title.499
Zhong L, Liu J, Shao JJ, et al. Phylogenomic analysis reveals multiple evolutionary origins of selfing in Primula section Obconicolisteri. New Phytol. 2023;239(6):2351-2364. https://doi.org/10.1111/nph.19136
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Copyright (c) 2026 Gyeltshen, Ngawang Tenzin, Tiger Sangay , Sangay Tshewang , Phuentsho, Lam Norbu , Rinchen Dorji , Namgay Shacha (Author)
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