1. Bawri, A., Baro, D., Singh, Y.D. and Sarma, K., 2024. Ophiorrhiza gajureliana (Rubiaceae): A New Species from Arunachal Pradesh, India. Vegetos. https://doi.org/10.1007/s42535-024-01094-w
2. Bhuyan, B., Baruah, S. and Mehmud, S. 2021. Ophiorrhiza recurvipetala (Rubiaceae) sp. nov. From Assam, India. Nordic Journal of Botany 39: e03048. https://doi.org/10.1111/njb.03048
3. Bremer, B. and Manen, J.F., 2000. Phylogeny and Classification of the subfamily Rubioideae (Rubiaceae). Plant Systematics and Evolution, 225, pp.43–72. https://doi.org/10.1007/BF00985458
4. Deb, D.B. and Gangopadhyay, M., 2025. Flora of India (Rubiaceae-Moringaceae), Volume 14. In Jayanthi, J., Gangopadhyay, M., Jalal, J.S., Agrawala, D.K., Dash, S.S. & Mao, A.A. (eds). Botanical Survey of India, Kolkata.
5. Deb, D.B. and Mondal, D.C., 1997. Taxonomic Revision of the Genus Ophiorrhiza L. (Rubiaceae) in Indian Subcontinent. Bulletin of the Botanical Survey of India, 39, pp.1–148. https://doi.org/10.20324/nelumbo/v39/1997/74298
6. Fischer, C.E.C., 1938. The Flora of Lushai Hills. Records of the Botanical Survey of India, 12(2), pp.75–161.
7. Hajra, P.K., Verma, D.M. and Giri, G.S., 1996. Materials for the flora of Arunachal Pradesh Vol. 1. Botanical Survey of India, Calcutta.
8. Hareesh, V.S. and Sabu, M., 2018. The Genus Ophiorrhiza (Rubiaceae) in Andaman and Nicobar Islands, India with a New Species. Phytotaxa, 383(3), pp.259–272. https://doi.org/10.11646/phytotaxa.383.3.3
9. Hareesh, V.S. and Sabu, M., 2022. Taxonomic Studies on Indian Ophiorrhiza L. (Rubiaceae): With a New Variety, New Distributional Record of O. medogensis H.Li for India and the Identity of O. recurvipetala Bhuyan, Baruah & Mehmud. Adansonia, 44(5), pp.29–36. https://doi.org/10.5252/adansonia2022v44a5
10. Hareesh, V.S., Joe, A. and Sabu, M., 2017. Ophiorrhiza debiana (Rubiaceae, Rubioideae), a new species from Northeast India. Phytotaxa, 309(3), pp.291–294. https://doi.org/10.11646/phytotaxa.309.3.13
11. Hooker, J.D., 1880. Flora of British India. Volume 3, L. Reeve and Co., London.
12. IUCN., 2024. The IUCN Red List of Threatened Species (Version 2024–1). https://www.iucnredlist.org/
13. Jeyaprakash, K. and Balachandran, N., 2023. Ophiorrhiza ripicola Craib (Rubiaceae), a new record to India from Arunachal Pradesh. Biodiversity: Research and Conservation, 70, pp.9–12. https://doi.org/10.14746/biorc.2023.70.5
14. Lalnunfeli, R., Lalawmpuii, L., Yadav, P.B.S., Karuppusamy, S. and Richard, P.S.S., 2025. Ophiorrhiza mizoramensis (Rubiaceae) – A New Species from Mizoram, India. Feddes Repertorium, 136(4), pp.1–7. https://doi.org/10.1002/ fedr.70036
15. Shang, C., Xue, J., Yang, Y., Lia o, X., Liu, Q. and Wu, L., 2024. Ophiorrhiza reflexa (Rubiaceae), a New Species from a Karst Region in Guangxi, China., PhytoKeys 238: 231–240. https://doi.org/10.3897/phytokeys.238.116767.figure4
16. Wu, Z.Y. and Raven, P.H., 1994. Flora of China. Science Press & Missouri Botanical Garden.