This study characterized the woodlands dominated by the deciduous Chilean-endemic species Nothofagus glauca (local name hualo) in the Cordillera de la Costa and foothills of the Andes, between latitudes 35 degrees and 37 degrees South. Fieldwork and subsequent analysis followed Braun-Blanquet methodology, and considered both hualo-dominated woodland and the associated scrub communities arising after disturbance. These woodlands are considered to form part of a single association, which we denominate Bomareo salsillae-Nothofagetum glaucae ass, nova. The syntaxonomic position of the new association is discussed, and a new suballiance including it is proposed, Nothofagenion glauco-alessandri suball. nova.