摘要:

Viene qui proposto un nuovo assetto tassonomico delle biscutelle italiane della Ser.LyrataeMalin. Lo studio dei caratteri morfologici è stato condotto sulle popolazioni naturali e la variazione morfologica riscontrata è stata interpretata sul piano tassonomico tenendo conto anche dei meccanismi riproduttivi.

ISSN:0083-7792    

DOI:10.1080/00837792.1991.10670489

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

After a systematic revision of the Greek Aristolochias, based on both dried and living material, 12 species, one of which represented by 1 subspecies and another by 2 subspecies, have been recognized to grow in the country:A. sempervirensL.,A. hirtaL.,A. guichardiiP.H. Davis et Khan,A. creticaLam.,A. incisaDuchartre,A. parvifoliaSm.,A. pallidaWilld. ssp.pallida, A. luteaDesf.,A. elongata(Duchartre) Nardi,A. microstomaBoiss. et Spruner,A. rotundaL. ssp.rotunda, A. rotunclassp.insularis(Nardi et Arr.) Gamisans,A. clematitisL.

ISSN:0083-7792    

DOI:10.1080/00837792.1991.10670490

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Data are given on the genetic structure, morphology and chorology of the Long-Spurred orchid,Orchis longicornuPoiret (1789) from Sardinia and the occurrence in this island of the morphologically similarOrchis morioL. (1753), often recorded for Sardinia, is investigated. The genetic analysis of 27 enzyme loci 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'sD= 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 withO. moriofrom continental Italy, significant differences in genetic variation were observed: average He= 0.16 in the former, 0.12 in the latter; (v) the genetic distance found between Sardinian populations and those ofO. moriofrom continental Italy is relatively high: average Nei'sD= 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 thatO. moriois not present in the material genetically analyzed from Sardinia, which includes a single species, apparently corresponding toO. 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-1andGpi-1) to genetic drift effects. The hypothesis that some alleles (Gpi-1100,Dia101,NADHdh-296) found inO. morioand recorded at low frequency in a few Sardinian populations reflect palaeointrogressive phenomena (owing to sporadical immigrant individuals ofO. moriohaving diluted their genes inO. longicornugenome 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 ofO. longfcornufrompatria typica(Algeria) and ofO. moriofrom continental Italy. The typification ofO. longicornuis given. The specimens from Sardinia correspond well, on a morphological basis, to the Algerian ones and therefore were all assigned toO. longicornu.Several characters were considered, differentiatingO. longicornufromO. morioboth 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 ofO. moriofrom Sardinia, that appear to be misidentifications ofO. longicornu.A description ofO. longicornufrom Sardinia is provided, and its distribution in the island is defined, on the basis of (i) a critical revision of literature records, and (ii) the examination of fresh and dried Sardinian specimens.O. longicornuis shown to be widespread throughout Sardinia, living in many different habitats from 0 to 1500 m a.s.l.

ISSN:0083-7792    

DOI:10.1080/00837792.1991.10670491

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The Botanical Museum of the University of Florence contains a volume of eighteenth century herbarium specimens which were presented to Filippo Parlatore when he visited Sweden in 1851. It contains nine sheets of specimens from the herbaria of Linnaeus, Linnaeus filius, Swartz, Thunberg and Acharius. Each of the sheets is described and illustrated, and its type status discussed. Probable syntype material is present forLeucojum vernum L., Thunbergia capensisRetzius andChrysocoma cemuaThunb., non L.

ISSN:0083-7792    

DOI:10.1080/00837792.1991.10670492

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

This paper represents the continuation of my previous study on the group of species ofCtenitiswhich in the meantime has been established as an independent genus with the name ofTriplophyllumby Holttum. Firstly it deals withAspidium protensumAfzel. ex Sw. based on the specimens from Sierra Leone collected by Afzelius. All the known specimens kept at S, UPS, BM and B have been studied and that at S is designated as the lectotype. They turned out to represent a hybrid, presumably derived from the two postulated parentsT. heudelotiiPic. Ser. andT. jenseniae(C. Chr.) Holttum. The hybrid differs also morhologically from the species which usually was namedDryopteris protema, Ctenitis protensaandTriplophyllum protensum.SinceAspidium × protensumis a hybrid, the epithetprotensumcannot any longer be applied to the above-mentioned species. This is described as a new species with the name ofTriplophyllum heudelotiiPic. Ser. (Holotype:Heudelot 703from Senegambia, G) since no name is available for it. In factT. subquinquefidumis the only name which could have been regarded as available, as it is mostly considered as a synonym of the above-mentioned species, now calledT. heudelotii.However, a careful study of its basionym,Aspidium subquinquefidumP. Beauv., has shown, on the contrary, that it represents a species on its own. Thus, the new combinationTriplophyllum subquinquefidum(P. Beauv.) Pic. Ser. is established, its lectotype is designated and the characteristics which distinguish the two species from each other are pointed out. Finally the new combinationTriplophyllum fraternum(Mett. ex Kuhn) Holttum subsp.bioköense(Pic. Ser.) Pic. Ser. andTriplophyllum attenuatum(Pic. Ser.) Pic. Ser. are established. These taxa were described in my previous paper of 1985, and ascribed to the genusCtenitis, but were not taken into consideration in HOLTTUM'S paper onTriplophyllumpublished a few months later in 1986.

ISSN:0083-7792    

DOI:10.1080/00837792.1991.10670493

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

ISSN:0083-7792    

DOI:10.1080/00837792.1991.10670494

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

ISSN:0083-7792    

DOI:10.1080/00837792.1991.10670488

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor