Urginea Maritima(L.) Baker: Biotipi 2n, 3n, 4n, 6n. e Loro Distribuzione Geografic

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Abstract
The author reports the results concerning the polyploidy of Urginea maritima (L.) Baker and the geographical distribution of the polyploid types (polyplotypes). Diploidy, 2n = 20, characterizes the plants coming from the following localities: Sicily: Agrigento, Bosco di Mimiani (Caltanissetta), Contrada Balate (Caltanissetta), Portella del Vento (Caltanissetta), Buccheri (about 40 km. from Siracusa), Siracusa, Contrada Pietramarina (Catania), Milazzo (Messina); Calabria: Saracena (Cosenza), Sambiase (Catanzaro); Puglie: Maglie (Penisola Salentina), Taranto (5 km. from), Martina Franca (Taranto), Monopoli (Bari); Balearic Islands: Arta on the island of Mallorca. Diploid biotypes have been previously reported in Capo Palinuro (Campania) by Maugini (1953), in Capri by Giuffrida (1950) and in Porto Conte (Sardinia) by Maugini (1953). Triploidy, 3n = 30, characterizes the plants coming from the following localities: Tuscany: Buggiano (Pistoia); Liguria: San Remo; The occurrence of triploidy in Urginea maritima, has been previously reported by Giuffrida (1950) for one plant collected at the Rome Botanical Garden. Tetraploidy, 4n = 40, characterizes the plants coming from the folllowing localities: Puglie: Ostuni (Brindisi), Carovigno (Brindisi), Taranto (about 5 km. from the city), Monopoli (Bari), Altamura (Bari), Corato (Bari), Cerignola (Bari); Islands of Pianosa and Capraia; Sardinia: Monte Acuto (Sassari); Balearic Islands: Ibiza (doubtful origin, the plants have been received from the Botanical Garden of Barcellona; Israel: near Ramle (Jerusalem); Tunisia: Ariana (Tunis); Algeria: Hamma (Algiers); Canary Islands: Tenerife; Tetraploid biotypes have been previously reported in Acquaviva delle Fonti (Bari) by Giuffrida (1950) and in Cagliari (Sardinia) by Martinoli (1949). Hexaploidy, 6n = 60, characterizes the plants coming from the following localities: Portugal: Serra de Monsanto; Marocco: Rabat; This is the first report of hexaploidy in this species. Both diploid and tetraploid biotypes have been observed growing together in the following localities: Taranto, Monopoli (Bari).