FlorentÃn, M.N., J.E. FlorentÃn, and R.M. Salas. 2020. Integrative taxonomic analyses sheds light on three historically disputed American Spermacoce species, and a key to the American species of Spermacoce (Spermacoceae, Rubiaceae). Syst. Bot. 45: 585-606.
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