Ophioglossum nudicaule (Ophioglossaceae) and Paspalum serpentinum (Poaceae), two new records for the Yucatán Peninsula, Mexico Údair: Ortiz-Díaz, Juan Javier, Tun-Garrido, Juan, Ancona, Juan José

The genus Paspalum L. (Paspaleae, Poaceae) of the Yucatan Peninsula, Mexico Údair: Ortiz-Díaz, Juan Javier, Arnelas, Itziar, Cerros-Tlatilpa, Rosa, Siqueiros-Delgado, María Elena, Tun-Garrido, Juan

Statistical analyses of morphological variation in the Gymnopodium floribundum complex (Polygonaceae): definition of three subspecies Údair: Ancona, Juan José, Ortiz-Díaz, Juan Javier, de Luna, Efrain, Tun-Garrido, Juan, Barrientos-Medina, Roberto Carlos