Evaluation and monitoring of populations of Swertia perennis in the Ayllón mountain range, Spain - GARCÍA-MATESANZ, S., BENAVENTE-MENA, C., CASTELO-SCHREMMER, J., MARTÍN-CLEMENTE, J.P., RUIZ-LÓPEZ, C., POSTIGO-MIJARRA, J.M. & MARTÍNEZ-GARCÍA, F. (Xx International Botanical Congress, 2024)