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RESUMENLos Nevados de Chillán han sido históricamente un punto casi obligado de visita y de estudio para muchos botánicos, ya que su flora nativa es extremadamente interesante por su origen subtropical, por su alto nivel de endemismo y por su carácter altoandino. En la actualidad se observa un alto grado de perturbación antrópica debido a la presión ejercida en varios sectores por la actividad inmobiliaria y turística, principalmente. En esta cordillera se encuentran dos áreas silvestres protegidas, la Reserva Nacional Ñuble y la Reserva Nacional Los Huemules de Niblinto. La flora de plantas vasculares de los Nevados de Chillán está representada por 616 especies, de las cuales 422 son nativas, 128 son endémicas de Chile y 66 son introducidas. La familia mejor representada es Asteraceae con 116 especies. Entre las especies características de esta zona destacan: ABSTRACTThe Nevados of Chillan have historically been an almost obligatory point of visit and study for many botanists since their native flora is extremely interesting, due to its subtropical origin, its high level of endemism and its high-Andean character. At present, there is a high degree of disruption due to anthropogenic pressure in various sectors because of property business and tourism in particular. In this mountains are two protected wildlife areas, the National Reserve Ñuble and the National Reserve Los Huemules de Niblinto. The vascular flora of the Nevados of Chillan is represented by 616 species, of which 422 are native, 128 are endemic to Chile and 66 are introduced. The Asteraceae family is the best represented with 116 species. Among the most characteristic species of this area are:

A vegetation survey of the Andean Nevados de Chillán volcanic complex, Bío-Bío Region, Chile, resulted in the preparation of a colour vegetation map, based on photo-interpretation of an aerial photograph of 1998. Classification followed a divisive method and combined physiognomic, floristic, and pedologic criteria. It resulted in eleven distinguishable vegetation units: (1) Nothofagus dombeyi forest, (2) N. pumilio forest, (3) Nothofagus mixed forest, (4) N. pumilio krummholz, (5) N. antarctica krummholz, assemblages of (6) Adesmia emarginata-Pozoa coriacea, (7) Adesmia emarginata-Berberis empetrifolia, (8) Adesmia emarginata-Loasa lateritia, (9) Chusquea culeou-Coirones, and (10) Caltha sagittata-Mimulus luteus, and the (11) Nassauvia revoluta-Poa obvallata assemblage which builds the upper vegetational belt. The study area´s vegetation, located in the Mediterranean-temperate transition zone, shows a higher floristic affinity to temperate regions´ vegetation.

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