%I Montes %A Silvia Guerrero Garcia %A Felipe Martinez Garcia %A Vanesa Martinez Fernandez %A Felix Perez Garcia %L upm8170 %X Senecio coincyi Rouy (Asteraceae) is a threatened endemic species from the mountains of Sierra de Gredos, centraf western Spain. This species is protected by the Autonomous Community of Castile and León (Spain) and is included in the "In danger of extinction" category in the protected flora catalogue of that region. It was later catalogued as Vulnerable (VU) on the Red List of Threatened Spanish Vascular Flora (Moreno et al., 2008). In this paper, the results of a two-year investigation of S. coincyi population biology are shown. The aim of this work was to study several aspects of S. coincyi reproductive biology. %D 2010 %B Seed Ecology III. 3rd International Society for Seed Science Meeting on Seeds and the Environment %C Salt Lake City, Utah, EEUU %T Evaluation of reproductive success in Senecio coincyi Rouy, a threatened species from Spain