Additions to the vascular flora of the islands of Procida and Vivara (Campania, Southern Italy).

Additions to the vascular flora of the islands of Procida and Vivara (Campania, southern Italy). In the present work new data of vascular plant species (Amaranthus graecizans subsp. silvestris, Amaranthus viridis, Antirrhinum siculum, Araujia sericifera, Catapodium pauciflorum, Diospyros kaki, Galinsoga quadriradiata, Gamochaeta pensylvanica, Oxalis debilis, Oxalis latifolia, Portulaca granulatostellulata, Stenotaphrum secundatum) and confirmation of previous findings (Foeniculum vulgare subsp. vulgare, Posidonia oceanica) are reported for the islands of Procida and Vivara. Furthermore, Kalanchoë ×houghtonii (casual) and Opuntia microdasys (naturalized) are new for the alien flora of the region (Campania), while Gazania rigens and Syringa vulgaris are reported for the first time in the province of Naples. The results obtained show the extensive presence of widely distributed and alien species. This may be due to progressive urbanization of the study areas and the increasing number of exotic species used in(and escaping from) artificial green areas.