Research Article |
Corresponding author: Lorenzo Peruzzi ( lorenzo.peruzzi@unipi.it ) Academic editor: Fabrizio Bartolucci
© 2023 Giovanni Gestri, Brunello Pierini, Marco D’Antraccoli, Andrea Bernardini, Lorenzo Peruzzi.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Gestri G, Pierini B, D’Antraccoli M, Bernardini A, Peruzzi L (2023) An updated inventory of the vascular flora of the Cerbaie hills (Tuscany, Italy). Italian Botanist 15: 165-175. https://doi.org/10.3897/italianbotanist.15.105302
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We present an updated list of the vascular flora occurring in the Cerbaie hills (Tuscany), a site of high naturalistic interest. The list is based on a literature survey and on field studies carried out in the years 2010–2022. The Cerbaie hills host a flora of 1,107 specific and subspecific taxa (including 100 naturalized aliens), 32 casual aliens and 10 hybrid taxa. Two taxa are new for Tuscany: Carex oedipostyla and Thalictrum simplex subsp. galioides; 330 taxa are new for the study area. Concerning old records, 344 have been confirmed, while 47 were not confirmed, albeit considered reliable. Moreover, we considered three taxa as locally extinct, 19 as doubtfully occurring, and three as wrongly reported. Despite the low elevation of the study area, life forms and chorotypes show marked Eurosiberian affinities, in agreement with the temperate and continental climate.
alien species, biodiversity, endemics, floristic data, phytogeography
A flora is a useful source of information for biogeographical, ecological and evolutionary studies (
The first floristic records for these hills can be found in
The aim of this study is to present a comprehensive analysis of previous literature, using an updated and coherent nomenclature, complemented by field investigations, to compile a floristic inventory of the vascular flora of the Cerbaie hills. It is part of a series of investigations carried out by the PLANTSEED Lab (Department of Biology, University of Pisa) devoted to improving the floristic knowledge of Tuscany (Pierini et al. 2008;
The Cerbaie are low hills (maximum elevation, reached in Montefalcone, is 117 m a.s.l.) that cover an area of ca. 114 km2 in the middle portion of northern Tuscany (Fig.
Localisaton of the Cerbaie hills in Italy. The red line circumscribes the study area. The different shades of colours identify disjunct territories belonging to the same municipality. AL = Altopascio (Lucca), CA = Calcinaia (Pisa), BI = Bientina (Pisa), SMM = Santa Maria a Monte (Pisa), SCA = Santa Croce sull’Arno (Pisa), CS = Castelfranco di Sotto (Pisa), FU = Fucecchio (Firenze).
From a geological perspective, the Cerbaie hills are constituted mainly by Pliocenic and Pleistocenic sedimentary rocks and sediments (AA. VV. 2009). Soils are more or less acid, deriving from siliceous substrates (
The climate of the Cerbaie hills is temperate, continental and rather homogeneous (AA. VV. 2009), showing some degree of summer aridity, especially in July (
Concerning vegetation and land use, the southern portions of the Cerbaie hills are dominated by olive orchards and cultivated fields; the rest of the territory is mostly covered by woods, which cover about 40% of the surface, where Pinus pinaster subsp. pinaster and the alien Robinia pseudoacacia L. are becoming particularly widespread in recent times (
Most of the hills belong to the preapenninic acidophilous durmast oak vegetation series of plain areas from Tuscany and Umbria (Hieracio racemosi-Querco petraeae sigmetum), while surrounding areas belong to the peninsular hygrophilous geosigmetum of riparian vegetation (Salicion albae, Populion albae, Alno-Ulmion) (
To obtain a ‘working hypothesis’ concerning the number of taxa expected in the study area, we used the approach followed by
Nomenclature and circumscription of the taxa follows
The expected number of species/subspecies and alien taxa was 1,021 and 86, respectively.
A total of 1,107 specific and subspecific taxa currently occur in the study area, including 100 naturalized aliens, representing about 9% of the established flora, not considering casual aliens (32) and hybrid taxa (10); two are new records for Tuscany, and 330 are new for the Cerbaie hills. While 344 taxa have been directly confirmed during field surveys, 47 taxa reliably recorded in the past were not confirmed. We excluded three taxa, while three other taxa were considered as locally extinct and 19 as doubtfully occurring in the area.
Three families alone account for about 30% of the total vascular flora (Asteraceae 126 taxa, Fabaceae 112, and Poaceae 96), although Cyperaceae are also well represented (53). The most represented genera are Trifolium (35), Carex (20), Lathyrus (17), Juncus, and Vicia (15).
Biological and chorological spectra highlight that hemicryptophytes (35.2%), therophytes (32.2%), and geophytes (15.1%) are the most represented life forms, followed by phanerophytes (11.7%), hydrophytes (3.1%), and chamaephytes (2.7%). As far as the chorological spectrum is concerned, Eurosiberian (32.5%) and transitional Eurosiberian-Mediterranean (25.5%) are the most frequent chorotypes, followed by wide distribution (16.5%) and Mediterranean (15.4%). Alien taxa represent 9% of the total flora.
Italian endemics are 13: Cardamine apennina Lihová & Marhold, Crocus biflorus Mill., Hieracium grovesianum Arv.-Touv. ex Belli, Melampyrum italicum (Beauverd) Soó, Ornithogalum etruscum subsp. etruscum, O. etruscum subsp. umbratile (Tornadore & Garbari) Peruzzi & Bartolucci, Ophrys appennina Romolini & Soca, O. classica Devillers-Tersch. & Devillers, O. maritima Pacifico & Soca, Polygala flavescens subsp. flavescens, P. nicaeensis subsp. italiana (Chodat) Arrigoni, P. vulgaris subsp. valdarnensis (Fiori) Arrigoni, and Scabiosa uniseta Savi. In addition, there is also a microspecies, putatively a narrow endemic to the study area, namely Taraxacum cerbariense Arrigoni. Three species recorded by previous authors were not found, and could be possibly extinct at the local level, i.e. Lysimachia tenella L., Menyanthes trifoliata L., and Potentilla alba L.
With respect to the predicted richness based on SARs, the number of species/subspecies is 8% above the theoretical prediction. This suggests a high floristic richness of the study area, as compared with other areas in Tuscany (
Many of the taxa occurring in the Cerbaie hills are of high phytogeographical interest. Drosera rotundifolia L. is found at the southern margin of its distribution range, while other taxa can be found in Tuscany only in the Cerbaie hills (i.e. the new records Carex oedipostyla Duval-Jouve and Thalictrum simplex subsp. galioides (DC.) Korsh.) or still survive only there in Tuscany (Exaculum pusillum (Lam.) Caruel and Gentiana pneumonanthe subsp. pneumonanthe) (Peruzzi and Bedini 2013 onwards). There are species which usually grow at higher elevations, such as Asphodelus macrocarpus subsp. macrocarpus, Betula pendula Roth, and Veratrum album L.
Other rare species in Tuscany are: Cardamine amporitana Sennen & Pau, Carex demissa subsp. demissa, C. rostrata Stokes, Cicendia filiformis L., Cyperus michelianus (L.) Link, Dictamnus albus L., Hottonia palustris L., Hydrocotyle vulgaris L., Hypochaeris maculata L., Juncus heterophyllus Dufour, Lathraea clandestina L., Lysimachia minima (L.) U.Manns & Anderb., Lythrum tribracteatum Salzm. ex Spreng., Melampyrum pratense subsp. commutatum (Tausch ex A.Kern.) C.E.Britton, Nymphoides peltata (S.G.Gmel.) Kuntze, Solenopsis laurentia (L.) C.Presl (also originally described from this area, see
The taxa showing some conservation interest (
Life forms and chorotypes show marked Eurosiberian affinities, despite the low elevation but in agreement with the temperate and continental climate. Comparing the flora of the Cerbaie hills with those of surrounding areas, in Monte Pisano (
Thanks to its rich and diversified flora, the Cerbaie hills stand out as one of the sites showing the highest phytogeographical and conservation interest in Tuscany.
Financial support by Fondazione per la Flora Italiana for the publication fee is gratefully acknowledged. We are grateful to the curators of the Herbaria of Florence (FI), Pisa (PI), and Siena (SIENA) for providing useful information on localities, literature, and/or digital images of some specimens.
Floristic list and records
Data type: PDF file