Biología floral y reproductiva de RESUMENSe determinó la biología floral y el sistema reproductivo de Escallonia pulverulenta, arbusto endémico de Chile central. Para ello se realizaron tratamientos de polinización manual, automática y natural a flores, evaluándose la producción de semillas por fruto. Además se determinó la longevidad floral, la producción de semillas según la distancia a la planta donante, los patrones de floración y su relación con los visitantes florales. La especie es autoincompatible y requiere vectores bióticos para reproducirse. Las plantas florecen sincrónicamente y logran el máximo despliegue floral a los 13 días de iniciar la floración. Cada flor queda disponible para ser polinizada durante 5 días y noches, y la fecundidad no incrementó con la distancia a la planta donante de polen. Las flores fueron visitadas por un ensamble diverso pero variable de polinizadores interanualmente. Debido a la longevidad de sus flores y su potencial reproductivo, esta planta podría utilizar una estrategia de floración masiva y atraer a un ensamble impredecible de polinizadores, los que luego de visitar las flores varias veces y durante varios días, logran adecuados niveles de polinización cruzada. PALABRAS CLAVE:Autoincompatibilidad, longevidad floral, distancia a la planta donante, polinizadores, matorral mediterráneo. ABSTRACTThis study examined the floral biology and reproductive system of Escallonia pulverulenta, an endemic shrub of central Chile. Manual, automatic and natural pollination treatments were performed, and seed set per fruit was evaluated. Also was evaluated floral longevity, seed production variation with the donor plant distance, the flowering patterns and its relationship with floral visitors. The species is self-incompatible and requires biotic vectors to reproduce. The flowers bloom synchronously and the floral display achieves their maximum thirteenth days after that flowering started. Each flower was available to be pollinated for five days and nights and fertility did not increase with distance from the pollen donor plant. The flowers were visited by a diverse assemblage of pollinators but variable between years. Because the longevity of their flowers and their reproductive potential, this plant could use a mass-flowering strategy and attract an unpredictable assembly of pollinators, which after visiting several times over several days the flowers could reach enough levels of cross pollination.
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