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Anh, T.T.P., Quang, B.H., Thanh, N.T., Nguyen, K.S. and Nuraliev, M.S. 2026. First record of the monospecific genus Clarkella (Argostemmateae: Rubiaceae) in Vietnam. Phytotaxa. 742, 3 (Feb. 2026), 243–249. DOI:https://doi.org/10.11646/phytotaxa.742.3.7.