Text this: VARIACION ESTACIONAL DE LA FLORA Y VEGETACION EN LA PRECORDILLERA ANDINA DE LA COMUNA DE PUTRE (I REGION DE TARAPACA, CHILE) DURANTE EL PERIODO 2002-2003 SEASONAL FLORISTIC AND VEGETATIONAL CHANGE IN THE PRE-ANDEAN MOUNTAIN IN PUTRE COUNTY (I REGION OF TARAPACA, CHILE), DURING 2002 AND 2003