Hai, D.V. and Huyen, D.D. 2012. New record of species Hygrophila episcopalis R. Ben. (R. Ben.) (Acanthaceae) for the flora of Vietnam. Academia Journal of Biology. 34, 2 (Jun. 2012), 187–189. DOI:https://doi.org/10.15625/0866-7160/v34n2.956.