Bouvardia xylosteoides Hook. & Arn. Bouvardia xylosteoides Hook. & Arn., Bot. Beechey Voy.: 428. 1840 sec. Lorence & al. 2011=Bouvardia villosa Standl., N. Amer. Fl. 32: 107. 1921 syn. sec. Borhidi 2006