Polystemma guatemalense (Schltr.) W.D. Stevens Polystemma guatemalense (Schltr.) W.D. Stevens in Novon 15(4): 618. 2005 sec. Juárez-Jaimes & al. 2007≡Labidostelma guatemalense Schltr. in Bull. Herb. Boissier, sér. 2, 6(10): 843-844. 1906 syn. sec. Stevens 2005