Le Piante endemiche della Sardegna: 110-111

Si descrive la Serapias nurrica e l'Orchis mascula

Le Piante endemiche della Sardegna: 177-178

Si descrivono Silene veluntina e Silene rosulata, camefite endemiche in Sardegna e in Corsica

Le Piante endemiche della Sardegna: 149-150

Si descrive la Viola corsica Nym. ssp. limbarae, pianta erbacea cespitosa, stolonifera, presente nelle alte montagne della Sardegna, e l'Ornithogalum biflorum, erba bulbosa perenne endemica in Corsica e in Sardegna

Le Piante endemiche della Sardegna: 130-131

Si descrive l'Ophrys sphegodes e l'Ophrys holoserica, sottospecie endemiche della Sardegna e della Corsica

Le Piante endemiche della Sardegna: 54-55

Si descrive l'Astragalus genargenteus e la Morisia monantha, specie endemiche in Sardegna e in Corsica

Le Piante endemiche della Sardegna: 71-73

Si descrivono: Orchis brancifortii, Plantago subulata e Mercurialis corsica, piante perenni endemiche in Sardegna e Corsica

<i>Silene velutinoides</i> Pomel (2<i>n</i> = 24) in Sardegna, nuovo reperto per la Flora Italiana

The presence of Silene velutinoides Pomel, hitherto regarded as un endemic species of northern Algeria, has been noted in two localitics of thc middle eastern calcareous area or Sardinia. Biological, taxonomical and ecological notes on the species are reported as well as its chromosomic somatic number (2n = 24)

Le Piante endemiche della Sardegna: 187

L'autore descrive l'Artemisia densiflora, Camefita endemica della Sardegna settentrionale

<i>Orchis longicornu</i> Poiret in Sardinia: genetic, morphological and chorological data

Data are given on the genetic structure, morphology and chorology of the Long-Spurred orchid, Orchis longicornu Poiret (1789) from Sardinia and the occurrence in this island of the morphologically similar Orchis morio L. (1753), often recorded for Sardinia, is investigated. The genetic analysis of 27 enzyme lo ci in population samples from locations where both species had been recorded showed that: (i) in the population samples from Sardinia the polymorphic loci are in Hardy-Weinberg equilibrium; (ii) these samples are genetically poorly differentiated from each other (average Nei's D = 0.01): less than 2% of the overall genetic variation observed is attributable to differences between populations (GST = 0.015); (iii) a high rate of gene flow was estimated between Sardinian populations: Nm ≈ 4, possibly owing to seed dispersal by wind; (iv) when Sardinian samples are compared with O. morio from continental Italy, significant differences in genetic variation were observed: average He = 0.16 in the former, 0.12 in thc latter; (v) the genetic distance found between Sardinian populations and those of O. morio from continental ltaly is relatively high: average Nei's D = 0.18, average Rogers' D = 0.22; (vi) highly significant differences in allele frequencies were found at a number of loci (Mdh-2, Sod-3, Pgm-1, Gpi-1, Gpi-2) between populations from Sardinia and continental Italy, each giving a probability of correct identification that varies from 0.90 to 1 (diagnostic loci). These findings provide evidence that O. morio is not present in the material genetically analyzed from Sardinia, which includes a single species, apparently corresponding to O. longicornu. The slight heterogeneity observed at some loci in the Sardinian population samples can be attributed in some cases (e.g. Mdh-1, Adh, Est-6) to local differences, possibly adaptive; in others (e.g. Pgm-1 and Gpi-l) to genetic drift effects. The hypothesis that some alleles (Gpi-1100, Dia107, NADHdh-296) found in O. morio and recorded at low frequency in a few Sardinian populations reflect palaeointrogressive phenomena (owing to sporadical immigrant individuals of O. morio having diluted their genes in O. longicornu genome through multiple generations of backcrosses) is not sufficiently supported by the available data. The genetic data are in agreement with the results from morphological studies. These involved the examination of about 1500 specimens (both alive and dried) from all over Sardinia, and their comparison with herbarium specimens of O. longicornu from patria typica (Algeria) and of O. morio from continental Italy. The typification of O. longicornu is given. The specimens from Sardinia correspond well, on a morphological basis, to the Algerian ones and therefore were all assigned to O. longicornu. Several characters were considered, differentiating O. longicornu from O. morio both in fresh and dried specimens. However, some of them, currently used in diagnostic keys, show much overlap between the two species. This explains the quotations of O. morio from Sardinia, that appear to be misidentifications of O. longicornu. A description of O. longicornu from Sardinia is provided, and its distribution in the island is defined, on the basis of (i) a critical revision of literature rccords, and (ii) the examination of fresh and dried Sardinian specimens. O. longicornu is shown to be widespread throughout Sardinia, living in many different habitats from 0 to 1500 m a.s.l

Natural hybridization and introgression between the Long-Spurred orchid, <i>Orchis longicornu</i> Poiret and the Green-Winged orchid, <i>O. morio</i> L. (Orchidaceae) in Corsica

Genetic studies have revealed in Southern Corsica, near Bonifacio, not only the existence of sporadic F1 hybrids between Orchis longicornu Poiret and O. morio L., but of a hybrid zone where both parental taxa are more or less introgressed. Our data indicate complete interfertility between the two taxa, which should therefore be considered as subspecies of the same biological species