Biarum tenuifolium (Araceae), a new record for the Flora of Tuscany

A new isolated site of Biarum tenuifolium (L.) Schott was discovered in southern Tuscany (Grosseto province), ca. 170 km to the northwest of the northernmost site known at present in Latium. The finding allows to add a new species (and genus) to the regional flora. Geographical, ecological, phenological and karyological details of the Tuscan population are provided in this study, together with a short discussion of its morphology in relation to some aspects concerning the still unclear infraspecific taxonomy of the plant in Italy. Based on current knowledge, the Tuscan population shows some of the diagnostic characters of B. tenuifolium subsp. abbreviatum (Schott) K.Richt., a mainly central-eastern Mediterranean taxon still not reported in the Italian floristic literature though indicated in a previous monographic work.