This paper is first inventarisation of threatened and invasive vascular plants on the rocky grasslands situated on northern slopes of mountain Matokit and abandoned arable land in vicinity of town of Vrgorac. These sites represent a new site for the Croatian flora. This research was conducted in year 2010 and 2011. We found 11 species of threatened vascular plants that by the Red Book (Nikolić and Topić [14]) and Flora Croatica Database (Nikolić [13]) and 15 invasive species, according to preliminary list of invasive alien species (IAS) in Croatia (Boršić et al. [3]). In this paper the habitat of some species, their distribution in Croatia, life forms and floral elements are described. It was found that threatened species occur exclusively on the rocky grassland habitat, except two species: critically endangered (CR) Papaver argemone and endangered (EN) Hibiscus trionum which were recorded on arable land. All inventoried invasive species, were recorded at the abandoned arable land, except the species Robinia pseudoacacia. Tendency for uncontrolled spread showed species Ailanthus altissima and Ambrosia artemisiifolia. Habitats of rocky grassland are on the stage of secondary succession (healing with the forest), and on the arable land the spread of invasive species exist (due to socio-economic changes: abandonment of agriculture and animal husbandry, and depopulation of the population). The results of these studies are contribution to the distribution map of threatened and invasive species in Croatia, and to the conservation of grassland habitat study area, as well as to preventing of the spread of invasive species.

-During a fl oristic survey of the northern slopes of Matokit Mountain in the surroundings of Vrgorac in central Dalmatia, a peculiar population of Cardamine belonging to the C. maritima complex was found. Because of its morphology, general habit, type of leaves and fruits, the collected plants were recognized as C. fi alae hitherto know only from Bosnia and Herzegovina. Morphologically, C. fi alae is similar to the Serbian endemic C. serbica with which it shares following characteristics: auricules at the base of lower cauline leaves, stem and rosette leaves bipinnate, margin of leafl ets serrate with hairy main stem and sepals, although it differs in having bigger petals and sepals, longer fi laments and 1-2 lateral stems. C. fi alae grows on lower altitudes in rocky ground within the vegetation of forest fringes of the sub-Mediterranean zone. This is the fi rst report of the endemic species C. fi alae in Croatian fl ora.

The vascular flora of Matokit Mt (Biokovo Massif) in southern Croatia was researched in different vegetation periods from 2010-2015, and a total of 604 vascular plant taxa belonging to 86 families and 337 genera were found. The studied area has never been studied in the past and these are the first detailed floristic data about grasslands in different succession stages of Matokit Mt. Collected herbarium specimens (345 sheets) were digitalized and are available at the ZAGR Virtual Herbarium. The most dominant families were legumes (Fabaceae 9.9%), grasses (Poaceae 9.1%), daisies (Asteraceae 7.4%) and mints (Lamiaceae 6.8%). The analysis of life forms shows the dominance of hemicryptophytes (39.9%) and therophytes (26.2%) on Matokit Mt that indicates a high influence of the Mediterranean climate. A total of 36 endangered and 17 invasive plant taxa across the whole studied area were recorded. Endemic are 32 plant taxa (26 endemics in a broader sense and 6 stenoendemics) and they represent new site of Croatian flora. The occurrence of some very rare endemics (Cardamine fialae Fritsch and Erysimum croaticum Polatschek) in the flora of Matokit Mt is of special interest for the national flora.