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The inventory of the taxa collected during the annual field trip of the working group for Floristics, Systematics and Evolution of the Italian Botanical Society is reported. The field trip was held in 2016 along the Velino and Aterno valleys located between Lazio and Abruzzo administrative regions (central Italy). The flora documented for the studied area amounts to 629 specific and subspecific taxa (including two hybrids) belonging to 300 genera and 69 families. Thirty-eight taxa are endemic to Italy, and only 16 alien taxa were detected. Thirty-eight taxa are included in the IUCN Red List of the Italian Flora. Twenty-four taxa have to be considered as floristic novelties because either new or confirmed for the regional flora of Lazio or Abruzzo. In particular, 15 taxa are new and 6 are confirmed for Lazio. Regarding Abruzzo, 2 taxa are new for the regional flora and one is confirmed. Furthermore, the alien status in Lazio has been updated for one taxon.

Abstract The Euganean Hills are a well-known refugee site for thermophilous woody flora in northern Italy. Among the species recorded here, there is Quercus dalechampii. The Euganean Hills are the only northern Italy site where the occurrence of this oak species is considered. The aim of this paper was to verify the presence of Q. dalechampii in the study area and to select possible diagnostic morphological traits that are usable to distinguish it from Q. petraea and Q. pubescens. Forest stands dominated by Q. petraea, Q. pubescens, and the presumed Q. dalechampii were sampled using the phytosociological approach to highlight their ecological features. Leaf and fruit material from 104 oak individuals was analysed from a macro-morphological and micro-morphological point of view. Leaf shape was also analysed using the geometric morphometric approach. All multivariate analysis procedures applied on the matrices of leaf and fruit traits highlighted two main clusters of morphological diversity. One was restricted to Q. pubescens individuals, and the other one was a mix of Q. petraea and presumed Q. dalechampii individuals. According to the twig and leaf trichome traits, all presumed Q. dalechampii individuals were classified as belonging to the Q. petraea collective group. Morphological differences between Q. petraea and presumed Q. dalechampii were considered not significant. In conclusion, the occurrence of a third oak species, in addition to Q. petraea and Q. pubescens, was not confirmed for the study area by the results of this paper. Graphic abstract