Flora of Italy
The flora of Italy is all the plant life present in the territory of the Italian Republic. The flora of Italy was traditionally estimated to comprise about 5,500 vascular plant species. However, as of 2019, 7,672 species are recorded in the second edition of the flora of Italy and in its digital archives Digital flora of Italy. In particular, 7,031 are autochthonous and 641 are non native species widely naturalized since more than three decades. Additionally, further 468 exotic species have been recorded as adventitious or naturalized in more recent times.
Geobotanically, the Italian flora is shared between the Circumboreal Region and Mediterranean Region. According to the index compiled by the Italian Ministry for the Environment in 2001, 274 vascular plant species were protected. Italy has 1,371 endemic plant species and subspecies.
Biodiversity
Italy is one of the richest European countries in both plant and animal biodiversity, with a population very rich in endemic forms, and has the highest level of biodiversity of both animal and plant species within the European Union. During the Pleistocene glaciations, the Italian territory remained largely free of ice, which allowed the flora and fauna to survive, something that did not happen in the central-northern areas of the continent, and the retreat of the great glaciers has left glacial relict fauna in some mountain locations.The Italian territory extends over about 10° of latitude, therefore, while remaining in the context of temperate climates without extremes of heat, cold or aridity, the climatic difference between the north and the south of the country is not at all negligible, going from the nival climates of the Alpine peaks, to the cool semi-continental temperate climate of the Po Valley, to the Mediterranean climate of the central-southern coasts and the islands. Italy is predominantly hilly and mountainous in nature of the territory, which has caused a proliferation of ecological niches, close in space but very diversified.
Geography and climate
Italy consists of a 1,000 km long peninsula extending out into the central Mediterranean, together with a number of islands to the south and west. The Apennines run north-south through the peninsula connecting the Alps in the north to Etna and the Peloritani mountains in Sicily in the south. The geology is diverse.Northern Italy is dominated by the Alps and an extensive valley of the Po river which is extensively agricultural and industrialised. Central Italy includes the regions of Tuscany, Umbria, Marche and Lazio. It is dominated by the Apennines, from which a few major rivers flow. There are few natural plains. A process of land reclamation has replaced the coastal swamps and marshes with agricultural land.
Southern Italy includes the regions of Abruzzo, Molise, Apulia, Basilicata, Calabria and Campania. Agriculture and industry are less developed. The main islands are Sicily, Sardinia and the Aeolian Islands.
Because of the length of the Italian Peninsula and the mostly mountainous hinterland, the climate of Italy is highly diverse. In most of the inland northern and central regions, the climate ranges from humid subtropical to humid continental and oceanic. In particular, the climate of the Po Valley geographical region is mostly continental, with harsh winters and hot summers. The coastal areas of Liguria, Tuscany and most of the South generally fit the Mediterranean climate stereotype. Each region has a distinct flora.
Ecoregions
An ecoregion is an ecologically and geographically defined area with characteristic natural communities and species. Different ecoregions are distinguished by different vegetation features. Most of the Italian territory is included in the Mediterranean Basin. Important Italian terrestrial ecoregions include the Illyrian deciduous forests, the Italian sclerophyllous and semi-deciduous forests, the South Apennine mixed montane forests, the Tyrrhenian-Adriatic sclerophyllous and mixed forests, Apennine deciduous montane forests, the Dinaric Mountains mixed forests and the Po Basin mixed forests.File:Gardenology.org-IMG 2679 ucla09.jpg|thumb|Sea marigold, a critically endangered species endemic to Sicily
In Italy Carlo Blasi et al. identified and mapped two divisions, 13 provinces, 33 sections and approximately 80 subsections. Each unit has an alphanumeric code that indicates its hierarchical level and a full name that indicates its geographic location and main diagnostic factor.
- the Temperate division includes the Alps, the Po Plain, and most of the Apennines. It accounts for 64% of Italy. This area is characterized by almost absent summer aridity and by marked differences between summer and winter temperatures. The natural vegetation mainly consists of forests, with broad-leaved deciduous plants.
- the Mediterranean division includes the southern Apennines, the Tyrrhenian and Ionian coasts, the southern Adriatic coast and the Islands. It accounts for almost 36% of the Italian territory. This area is characterized by summer aridity, with precipitations concentrated in autumn and winter. The natural vegetation mainly consists of mixed woods of evergreen and deciduous species, shrublands and Mediterranean maquis.
The floral composition
The peninsula and islands are dominated by the characteristics of the Mediterranean climate, with mild and rainy winters and very warm and dry summers. On the contrary, the north of Italy has lower temperatures in winter and a more uniform distribution of rainfall during the summer.
The species of plants present in Italy belong to the flora of the continental Europe or to the Mediterranean flora. In some cases Western species can be distinguished and eastern species.
The last ice age, the Würm Glaciation, in the Alps ended about 12,000 years ago, and one can still recognize its influence on vegetation, in particular by means of glacial relict species. A well known example is the Etna birch, driven in Sicily at a time when the climate was much colder.
Broadly there are three different vegetational zones of forests or bushes in Italy:
- Evergreen vegetation: maquis shrubland with densely growing plants and shrubs that always have leaves on. This flora is typical of the dry mediterranean climate, especially along the coast and in the islands. The most common plants are olives, agrumes, maritime pines, cork oaks, holm oak, carrubo, myrtles, strawberry tree, sage, junipers.
- Broad-leaved vegetation : it is typical of the mountain region with a humid climate. Temperate. The most common plants are Castanea sativa, Fagus sylvatica, the relicts Pinus mugo and Pinus nigra var. italica, Sorbus chamaemespilus, Arctostaphylos uva-ursi, and Vaccinium vitis-idaea. There are also a high number of endemic species increasing at higher elevations. Alpine species include Gentiana nivalis, Androsace alpina, Polygala chamaebuxus, Saxifraga oppositifolia and Carlina acaulis.
- Coniferous vegetation : it is an evergreen vegetation typical of the Alps and of a few high Apennines areas. Temperate. The most common plants present in this phytoclimatic area are Picea abies, Abies alba, Larix decidua, Pinus sylvestris, Pinus nigra, Pinus cembra and Pinus mugo.
There are also plant associations almost treeless: grasslands, pastures, deserts. In the mountains, gradually, the forest turns in mountain pastures, scattered in various shrubs and dotted with small colorful flowers. Higher up are the montane grasslands and even areas similar to a desert because they have no or almost no vegetation.
Species richness in Southern Europe
Italy has around 6,711 species of vascular plants, preceded only by the Iberian Peninsula and Balearic Islands with around 7,500 vascular plant taxa . In Greece, the number of species is around 5,700 and in France, there are 4,630 species. Per unit area Greece is the country with the highest concentration of native plant species.Endemic species
Italy has 1,371 endemic plant species and subspecies. Endemic species include Abies nebrodensis, Allium agrigentinum, Anthemis cupaniana, Calendula maritima, Erysimum etnense, Galium litorale, Petagnaea, Sicilian Fir, Silene hicesiae, Viola ucriana, Zelkova sicula, Aquilegia barbaricina, Aquilegia nuragica, Centaurea gymnocarpa, Centranthus amazonum, Cerastium utriense, Dianthus rupicola, Gagea chrysantha, Galium baldense, Galium glaucophyllum, Genista aetnensis, Hieracium lucidum, Iris benacensis, Iris bicapitata, Iris marsica, Iris pseudopumila, Ophrys calliantha, Orchis brancifortii, Polygala sinisica, Ribes sardoum and Santolina pinnata.Threats
, fragmentation and degradation are the most significant threats to plant species that occur in Italy. Also changing water flow patterns and over-extraction, increasing droughts due to climate change, pollution and the introduction of alien species threaten the flora. Other threats come from farming, urbanization and tourism.The cultivation of plants that give textile fibers, the cultivation of sugar beet, cereals, potatoes, orchards, vineyards and olive groves have almost replaced the natural vegetation.
The actions of man since Roman times have resulted in the destruction of most of the lowland forests and hills, the expansion of pastures, and the extinction of many species and in the introduction of exotic species which are then naturalized. For example, the Indian fig opuntia, is now common in the warmer parts of the Southern Italy. Also, the invasive false Acacia is widely spread.