Article

The Tuscan Maremma is a historical region of central western Italy of remarkable ecological and landscape value, with a surface of about 4.420 km2 largely corresponding to the province of Grosseto. A critical inventory of the native and naturalized vascular plant species growing in this territory is here presented, based on over twenty years of author's collections and study of relevant herbarium materials and literature. The checklist includes 2.056 species and subspecies (excluding orchid hybrids), of which, however, 49 should be excluded, 67 need confirmation and 15 have most probably desappeared during the last century. Considering the 1.925 confirmed taxa only, this area is home of about 25% of the Italian flora though representing only 1.5% of the national surface. The main phytogeographical features in terms of life-form distribution, chorological types, endemic species and taxa of particular conservation relevance are presented. Species not previously recorded from Tuscany are: Anthoxanthum ovatum Lag., Cardamine amporitana Sennen & Pau, Hieracium glaucinum Jord., H. maranzae (Murr & Zahn) Prain (H. neoplatyphyllum Gottschl.), H. murorum subsp. tenuiflorum (A.-T.) Schinz & R. Keller, H. vasconicum Martrin-Donos, Onobrychis arenaria (Kit.) DC., Typha domingensis (Pers.) Steud., Vicia loiseleurii (M. Bieb) Litv. and the exotic Oenothera speciosa Nutt.