Hedyotis rubra (Cav.) A. Gray Hedyotis rubra (Cav.) A. Gray in Mem. Amer. Acad. Arts, n.s., 4: 61. 1849 sec. Borhidi 2006=Oldenlandia rubra (Cav.) A. Gray in Smithsonian Contr. Knowl. 5(6): 68. 1853 syn. sec. Borhidi 2006