Statut démographique de Centaurea corymbosa Pourret ( Asteraceae), Hormatophylla pyrenaica (Lapeyr.) Cullen & Dudley ( Brassicaceae ) et Marsilea strigosa Willd. ( Marsileaceae-Pteridophyta ), trois plantes rares du sud de la France
Résumé
During 1994, we studied the demographic status of three rare species of the south of France : Centaurea corymbosa Pourret (Asteraceae), Hormotophylla pyrenaica (Lapeyr.) Cullen & Dudley (Brassicaceae) et Marsilea strigosa Willd. (Marsileaceae-Pteridoridophyta). The number of populations and the population sizes are given. Some observations on biology and life-history
traits are also discussed.