New Morphological, Distribution, and Ecological Data on (Caprifoliaceae), a Poorly Known Species of the Italian Flora, with Evaluation of Its Conservation Status and Typification of the Name.

This paper presents the results of a research performed on Gargano Promontory (SE-Italy) on the populations of , a species with little herbarium records and whose few morphological descriptions are outdated. belongs to the aggr., a group including very similar taxa that still have different taxonomic classifications. Its typical location is Monte Sant'Angelo in the Gargano area. Surveys have ascertained the existence of many populations, whose stational data help to understand the distribution and ecological conditions is linked to. The morphological analysis of a large sample (75 plants from 9 sites) allows for the description of the qualitative and quantitative characteristics of this species. The new morphological framework highlights the species autonomy of and can contribute to clarifying the relationship with and to which it is closer. In addition, for the correct delimitation of the species, the name is lectotypified. Finally, the species was assessed against the IUCN criteria for the evaluation of its conservation status.