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HSU, H.W.C., ARANAS, D.R., ALEJANDRO, G.J.D. and LIEDE-SCHUMANN, S. 2020. A new species of <em>Argostemma </em>(Rubiaceae)<em> </em>with free stamens in star-shaped corolla from the Philippines. Phytotaxa. 437, 2 (Mar. 2020), 113–117. DOI:https://doi.org/10.11646/phytotaxa.437.2.7.