Observations on the biology of Arum cylindraceum Gasp in Corsica

The study of several populations of the rare Corsican species A. cylindrace um Gasp. allows the description of its population structure. During its dev elopment, A. cylindraceum is heterophyllous: the limb shape varies accordin g to the age and size of the plant and the order of occurrence of the leaf. In the small populations, often counting less than ten plants, individuals are self fertile. In larger populations, they are self sterile. Most of th e populations of A. cylindraceum are clonal, but conservation of this speci es just needs ecosystem preservation.