Liu, W.-J., Gao, Q., Nguyen, K. S., Nguyen, D. V., & Wu, L. (2020).

Taxonomic studies on Ophiorrhiza in Vietnam I: Ophiorrhiza hiepii and O. hainanensis, a new species and new record from northern Vietnam

. Phytotaxa, 429(1), 65–72. https://doi.org/10.11646/phytotaxa.429.1.5