Contribution to a new vascular flora of Sardinia (Italy): I (1-30)

In the context of creating a new, updated, and revised vascular flora of Sardinia, this work contributes new data on the distribution of various taxa in the island. These include both native and alien taxa, which are characterized by their rarity, limited recognition, hytogeographical significance, potential issues, or novelty to Sardinia. These updates mostly result from floristic research primarily conducted in north Sardinia, with several discoveries in other sectors of the island. The first report of Convolvulus sabatius subsp. mauritanicus, Cyperus brevifolioides (naturalized) and Brachychiton populneus (casual alien) in Sardinia is documented here. Moreover, this study includes new distributional data for 27 taxa, some of which required confirmation. Notably, Trifolium clusii, previously considered doubtful in recent years, along with Fuirena pubescens and Silene inaperta, which were indicated for the southern part of Sardinia over thirty years ago and have not been reported elsewhere since. For others, an expansion or a better definition of their distribution range within the island is documented, as in the case of Chloris gayana, Digitaria ciliaris, Eragrostis curvula, Paraserianthes lophantha, Sporobolus indicus (naturalized alien species), Asparagus asparagoides, Cenchrus setaceus, Eclipta prostrata, Halophila stipulacea (invasive alien species), Allium sardoum, A. savii, Anthyllis barba-jovis, Asplenium marinum, Bellevalia romana, Butomus umbellatus, Cladium mariscus, Dianthus sardous, Dysphania botrys, Jacobaea maritima subsp. maritima, Leersia oryzoides, Nepeta foliosa, Nuphar lutea, Spirodela polyrrhiza, Utricularia australis (rare native).