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A complex catalytic cycle leading to a regioselective synthesis of o,o'-disubstituted vinylaromatics
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Notes about Ononis viscosa L. and O. breviflora DC. in Italy [Alcune note su Ononis viscosa L. e O. breviflora DC. in Italia]
No full textOnonis viscosa L. and O. breviflora DC. are two very closely related entities from a morfological and ecological point of view so that many authors consider them subspecies or even varieties. This contribution investigates their real presence in Italy by analyzing herbarium samples, bibliographic data and direct observation in the field. The length of the corolla compared to the calyx and of the raceme axis compared to the axilla leaf under the arista are two constant characters that differentiate them and all the italian samples examined, including those referred to as O. viscosa in the past, could be included in the variety of O. breviflora if the binomial be valid. The results of this research allows us to exclude O. viscosa from the Tuscan and Italian floras even through the systematic problem af the two taxa remains open and worthy of further study. © 2018 Società Botanica Italiana onlus
Romulea bulbocodium, R. linaresii, R. melitensis, R. ramiflora. In: Marhold K. (ed.), IAPT/IOPB Chromosome data 11
No full textContribution to the vascular flora of Castelvecchio nature reserve (Central Tuscany, Italy)
No full textIl presente lavoro riporta la flora vascolare della Riserva Naturale Regionale Castelvecchio, situata nel Comune di San Gimignano (Siena). La Riserva, con substrato di natura prevalentemente calcarea, ha un’estensione di 6,28 km2. Si riporta l’elenco floristico delle piante vascolari. Vengono inoltre forniti dati sulle forme biologiche e corologiche. Nel nostro contributo risultano 454 specie e sottospecie, suddivise in 73 famiglie e 185 generi. Lo spettro biologico rivela una dominanza di emicriptofite seguite dalle terofite, mentre lo spettro corologico mostra una maggioranza di specie a distribuzione eurasiatica rispetto a quella mediterranea, in accordo con le condizioni macro- e micro-climatiche. Sono presenti entità rare e/o con distribuzione frammentaria in Toscana come Cleistogenes serotina subsp. serotina, Ononis natrix e Phagnalon sordidum e due specie della Lista Rossa Italiana (Galanthus nivalis e Ruscus aculeatus). È inoltre da segnalare la presenza di entità rilevanti dal punto di vista fitogeografico come Taxus baccata, nonché popolazioni eterotopiche di Fagus sylvatica subsp. sylvatica. Le entità endemiche sono 6 (Digitalis micrantha, Helleborus viridis subsp. bocconei, Hieracium pallidum subsp. lanudae, Melampyrum italicum, Polygala flavescens subsp. flavescens, Scabiosa uniseta), un numero relativamente basso rispetto ad altre aree calcaree della Toscana centro-meridionale. Questa Riserva non può quindi essere considerata un’isola biogeografica su calcare dal punto di vista botanico, come altre aree protette in Toscana meridionale. Tuttavia, il mosaico vegetazionale, unito alle particolari condizioni geologiche e microclimatiche, rendono comunque la Riserva Naturale di Castelvecchio un’area di notevole importanza per la conservazione della biodiversità floristica della Toscana centrale dove coesistono popolazioni relitte ed isolate di specie mesofile che sopravvivono grazie al microclima fresco e umido dei valloni, a stretto contatto con quelle xerofile di gariga calcarea. L’eterogeneità ambientale unita all’elevato grado di naturalità rende possibile la presenza di specie rare e/o fitogeograficamente rilevanti e solamente quattordici sono le specie esotiche, la maggior parte delle quali presenti in modo casuale.This study reports the outcomes of botanical surveys of vascular plants carried out in the Castelvecchio Nature Reserve, located in the Municipality of San Gimignano (Siena province). The Reserve has an extension of 6.28 km2 with a predominance of calcareous bedrock. The compiled floristic inventory of the Reserve includes 454 species and subspecies, divided into 73 families and 185 genera. Data on life forms and chorological types are provided. The life-form spectrum revealed a dominance of hemicryptophytes followed by terophytes, whereas the chorological spectrum showed a majority of species with Eurasiatic distribution as opposed to a Mediterranean one, in line with the local macro and microclimatic conditions. Rare species in central Tuscany – such as Cleistogenes serotina subsp. serotina, Ononis natrix and Phagnalon sordidum − and two species on the Italian Red List − Galanthus nivalis and Ruscus aculeatus − were recorded. Also of interest is the occurrence of phytogeographically relevant entities as Taxus baccata and populations of Fagus sylvatica subsp. sylvatica outside of its altitudinal belt. Compared to other areas of central and southern Tuscany, the Italian endemics − Digitalis micrantha, Helleborus viridis subsp. bocconei, Hieracium pallidum subsp. lanudae, Melampyrum italicum, Polygala flavescens subsp. flavescens, Scabiosa uniseta – were less numerous. The Reserve does not have a species pool typical of limestone as other protected areas of central or southern Tuscany. However, the mosaic of different communities, combined with geological and microclimatic factors, makes the Reserve highly relevant for the conservation of biodiversity in central Tuscany. Its peculiarity is the presence of isolated populations of mesophilous species that are confined to ravines with a cool microclimate and are in contact with xerophilous species of calcareous garrigues. Besides a valuable heterogeneity of environments in the Reserve it is worth nothing that there are only fourteen alien species, mainly with a casual status of invasivity
Distribution of the genus Sternbergia Waldst. & Kit. (Amaryllidaceae) in Tuscany (central Italy)
No full textThe authors report an updated distribution of the genus Sternbergia Waldst. & Kit. (Amaryllidaceae) in Tuscany by the analysis of herbarium specimens, bibliographic references and records in the field. S. colchiciflora occurs in six localities, four in southern Tuscany and two in northern Tuscany. One out of them, the first in Firenze province, is here recorded. On the contrary, S. lutea is widespread in the region, but the distinction between natural populations and those escaped from cultivation is not always certain. Habitat suitability model at regional level for S. colchiciflora is also reported
Contributo alla conoscenza della flora vascolare endemica di Toscana ed aree contermini. 1. Crocus etruscus Parl. (Iridaceae)
No full textVascular flora of "Comate e Fosini" Natural Reserve (Southern Tuscany) [La Flora vascolare della Riserva Naturale Regionale “Cornate - Fosini” (Toscana Meridionale)]
No full textWe report the results of floristic research carried out in the 'Riserva Naturale Regionale Cornate e Fosini', situated along the border between the provinces of Siena and Grosseto. Firsdy, a brief description of the geomorphological, climatical and vegetational features of the area is given. Secondly, the list of the vascular flora is given, which was made out through floristic field researches, bibliography and herbarium specimens (SIENA, FI, Herb. Selvi). This list includes 591 species belonging to 85 families and to 325 genera; 568 of the species are spontaneous or naturalized plants, whereas 23 of them are introduced species. The biological spectrum shows that hemicryptophytes largely outnumber therophytes here - 42.6% against 25% - suggesting a mixture of subcontinental and mediterranean subclimate. This is also confirmed by a chorological analysis, which reveals an equal distribution of Mediterranean and Eurosiberian features and numerous connections with the Alpine-Appennine and Balkan regions. There are 3 endemic species - Centaurea paniculata subsp. carueliana, Cerastium arvense subsp. arvense var. etruscum and Viola etrusca. Moreover, a number of species are interesting from a phytogeographical and conservational viewpoint: Allium carinatum subsp. pulchellum, Carduus chrysacanthus, Deschampsiaflexuosa, Fritillaria orientalis, Gagea pusilla, G. villosa, Opbrys insectifera, Ranunculus millefoliatus, Salix apennina, Sternbergia colchiciflora and Viola ki taibeliana. The data collected indicate that the Riserva is a key area for the protection of many calcicolous xerophytes. Moreover, its environmental variety allows a fairly high level of floristic biodiversity
Gagea tisoniana, a new species of Gagea Salisb. sect. Gagea (Liliaceae) from central Italy
No full textGagea tisoniana Peruzzi et al. sp. nov. is described and its taxonomic relationship is discussed. The new species, which appears endemic to C Italy, is close to G. pratensis (Pers.) Dumort., G. pusilla (F. W. Schmidt) Sweet and to other mainly poorly known (i.e. G. succedanea Griseb. et Schenk, G. transversalis Stev., G. paczoskii (Zapal.) Grossh.) or as yet undescribed taxa from E Europe and E Mediterranean area. The recognition of the new taxon G. tisoniana is claimed on the basis of anatomical, karyological, ecological and phytogeographical data. Maps of the Italian distribution of G. pratensis (2n = 60), G. pusilla (2n = 24) and G. tisoniana (2n = 24) are presented, together with an analytical identification key. Finally, G. pratensis is here recorded for the first time in Tuscany (Monte Cetona)
Vascular flora of "Bosco Rocconi" WWF Oasis (Grosseto, Southern Tuscany) [Flora vascolare dell'Oasi WWF "Bosco Rocconi" (Grosseto, Toscana meridionale)]
No full textWe report the results of floristic research carried out in the "Bosco Rocconi" WWF Oasis. Firstly, a brief description of the geomorphological, climatical and vegetational features of the area is given. Secondly, the list of the vascular flora is given, which was made out through floristic field researches, bibliography and herbarium specimens. This list includes 548 species belonging to 88 families and to 362 genera; only 6 of them are introduced species. The biological spectrum shows that hemicryptophytes outnumber therophytes here - 39,4% against 28,1% - suggesting a mixture of subcontinental and mediterranean subclimate. This is also confirmed by the chorological analysis, which reveals an equal distribution of Mediterranean and Eurosiberian elements and numerous connections with the oroipsophylous subdominion. There are three endemic species (Cerastium arvense subsp. arvense var. etruscum, Leontodon rosani and Ornithogalum etruscum). Moreover, a number of species are interesting from a phytogeographical and conservational viewpoint: Biscutella cichoriifolia, Dictamnus albus, Cardamine monteluccii, Euphorbia pterococca, Linum nodiflorum, Ruscus hypoglossum, Santolina etrusca. The data collected indicate that the Oasis is a key area for the protection of many calcicolous xerophytes. Moreover, its environmental variety allows a fairly high level of floristic biodiversity. © 2018 Società Botanica Italiana onlus
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