Floristic data of the upper Segre and Llobregat basins. III

We provide data of special interest to the regional flora of the upper Segre and Llobregat basins (Eastern Pyrenees) related with previously unknown taxa or that are very rare in this area. Alien plants, such as Epilobium ciliatum Raf. (invasive), Berberis vulgaris L. subsp. vulgaris and Paulownia tomentosa (Thunb.) Steud. (casuals), are new to the flora of Catalonia. We also confirm the presence of Bidens cernuus L.–a species that apparently had not been observed in Catalonia since the early twentieth century– and document a population of the European wild vine Vitis vinifera subsp. sylvestris (C.C. Gmel.) Hegi; a taxon often considered of dubious presence in the NE Iberian Peninsula. For the narrow endemic Delphinium montanum DC., with only ten known populations, we report a new site that holds one of the largest populations.