Article

Preliminary data on the distribution in Latium of 21 species belonging to the genus Rosa L. are here presented. Specimens of University (RO, FI, UTV) and private Herbaria were analyzed and the taxa were identified mostly in accordance with Klastersky (1968) and partly with Henker (2000). The distribution maps, showing the occurrence of each. laxon in the region, were drafted using the UTM grid (10 x 10 Km). R. glutinosa Sibth. et Sm. and R. stylosa Desv., new to the flora of Latium, are very rare. R. pendulina L., R. montana Chaix, R. villosa L., R. pimpinellifolia L. and R. tomentosa Sm., restricted to mountainous areas, are quite rare. R. canina L. s.s., R. squarrosa (Rau) Boreau, R. agreslis Savi and R. sempervirens L., are widespread at lower altitude. R. arvensis Hudson is the only nemoral species. R. serafinii Viv., collected only once in 1864, is considered extinct.