Phyllotini. Doubtfully retained as a genus distinct from Phyllotis by Ellerman (1941), later included in Phyllotis as a formal subgeneric division (Osgood, 1947; Pearson, 1958) or not (Hershkovitz, 1962). Thomas (1919) remained firm regarding the generic distinctiveness of Phyllotis and Graomys, and the latter was so reinstated based on karyological data (Pearson and Patton, 1976) and other traits (see Olds and Anderson, 1989; Reig, 1978). Generic stature uniformly reinforced in broad phylogenetic studies of phyllotine taxa, using either morphological characters (Braun, 1993; Steppan, 1993, 1995) or molecular data (Anderson and Yates, 2000). Also see remarks under Andalgalomys, which Steppan (1995) included as a subjective synonym of Graomys.
Williams and Mares (1978) transferred Graomys pearsoni Myers, 1977, to Andalgalomys, and Massoia (1976) synonymized G. hypogaeus Cabrera, 1934, with Eligmodontia typus. Pardiņas (1995) identified the synonymy of Bothriomys with Graomys, contra Herskovitz (1962) who placed it under Euneomys (McKenna and Bell  placed it under both Graomys and Euneomys), and recommended retention of Graomys as nomen protectum, it being the familiar and long used genus-group name for these phyllotine rodents.