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  • 1
    Electronic Resource
    Electronic Resource
    Cytogenetic and phytochemical investigations in hybrids of MacaronesianDryopteris (Pteridophyta: Aspidiaceae) (1978)
    Springer
    Plant systematics and evolution 130 (1978), S. 235-252 
    Details
    ISSN: 1615-6110
    Keywords: Pteridophyta ; Aspidiaceae ; Dryopteris aemula ; D. azorica ; D. maderensis ; D. oligodonta ; D. crispifolia ; D. guanchica ; D. carthusiana ; D. campyloptera ; Hybrids ; cytology ; phloroglucinol composition ; Flora of Macaronesia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The cytology and phloroglucinol composition of wild and synthesized hybrids of MacaronesianDryopteris species have been examined. Both cytological and chemical evidence suggest that the tetraploidD. guanchica has arisen from the diploid speciesD. aemula andD. maderensis by hybridization and chromosome doubling. However, the formation of the characteristic fully aromatic compounds inD. aemula appears to be suppressed in most of the hybrids involving this species, and inD. guanchica.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00982808
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  • 2
    Electronic Resource
    Electronic Resource
    Delimitation ofPelargonium sect.Glaucophyllum (Geraniaceae) (1990)
    Springer
    Plant systematics and evolution 171 (1990), S. 15-26 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Geraniaceae ; Pelargonium sect.Glaucophyllum ; Morphology ; pollen ; chromosome numbers ; flavonoids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Pelargonium otaviense Knuth andP. spinosum Willd. are excluded from sect.Glaucophyllum, whileP. grandiflorum (Andr.)Willd.,P. patulum Jacq. andP. tabulare (Burm. f.)L'Hérit. of sect.Eumorpha are included. Sect.Glaucophyllum is characterized by green to glaucous vegetative organs and zygomorphic white to pink corolla with five narrow petals. All the species have an identical pollen and chromosome morphology, the same basic chromosome number (x = 11) and similar flavonoid patterns. A close relationship between sect.Glaucophyllum and sect.Pelargonium is indicated by the occurrence of natural hybrids and concordant characters. Isorhamnetin and luteolin have been detected in the genus for the first time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00940594
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  • 3
    Electronic Resource
    Electronic Resource
    Cytological variation and evolution withinPelargonium sectionHoarea (Geraniaceae) (1996)
    Springer
    Plant systematics and evolution 203 (1996), S. 111-142 
    Details
    ISSN: 1615-6110
    Keywords: Pelargonium ; sect.Hoarea ; Chromosomes ; B chromosomes ; Robertsonian translocation ; centric fusion ; evolution ; systematics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chromosome numbers of 65 species of sect.Hoarea have been determined. These show three basic chromosome numbers, x = 11, 10 and 9. Only a few species are tetraploid. In five species both diploid and tetraploid cytotypes are reported. Several cases of deviations in chromosome numbers and cytological abnormalities were found, most of these being related to the presence of B chromosomes that occur in eight species. Evidence is presented to suggest that the basic chromosome numbers of x = 10 and x = 9 are derived from x = 11 by centric fusion. Although variation in basic chromosome number withinPelargonium has been the subject of detailed study, this is the first time that evidence has been found for a mechanism of change in basic number, that of centric fusion by Robertsonian translocation. For the species of sect.Hoarea with x = 9, where the evidence for Robertsonian translocation is greatest, this process has probably taken place quite recently. In contrast to results from other sections of the genusPelargonium, the three different basic numbers of sect.Hoarea do not contradict its delimitation as a natural taxon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985241
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  • 4
    Electronic Resource
    Electronic Resource
    Hybridization and speciation in the genusDryopteris (Pteridophyta:Dryopteridaceae) on Pico Island in the Azores (1985)
    Springer
    Plant systematics and evolution 149 (1985), S. 241-252 
    Details
    ISSN: 1615-6110
    Keywords: Pteridophyta ; Aspidiaceae ; Dryopteridaceae ; Dryopteris aemula ; D. azorica ; D. crispifolia ; D. dilatata ; D. affinis subsp.affinis ; Hybrids ; cytology ; Flora of Pico ; Azores
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The cytology of wild hybrids ofDryopteris from Pico, Azores has been examined. This has confirmed the parentage of the hybrids, and provided evidence to support the view that the tetraploid speciesD. crispifolia has evolved in the Azores from two diploid species,D. aemula andD. azorica, by hybridization and polyploidy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00983310
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  • 5
    Electronic Resource
    Electronic Resource
    A cytological study ofPelargonium sect.Eumorpha (Geraniaceae) (1986)
    Springer
    Plant systematics and evolution 153 (1986), S. 205-222 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Geraniaceae ; Pelargonium ; Chromosome numbers ; karyotypes ; hybrids ; karyotype evolution ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The chromosome numbers of seven species ofPelargonium sect.Eumorpha have been determined from material of known wild origin, and karyotypic comparisons have been made. Within the section there is variation in basic chromosome number (x = 4, 8, 9, 11), variation in chromosome size, and two species have polyploid races. The three species with chromosome numbers based on x = 11 have the smallest chromosomes (1.0–1.5 µm); chromosomes are larger (1.0–3.0 µm) in the other species.P. elongatum has the lowest chromosome number in the genus (2n = 8).P. alchemilloides is exceptional in that it has four cytotypes, 2n = 16, 18, 34 and 36, and the form with 2n = 36 has large chromosomes (2.0–5.0 µm). Evidence from a synthesized hybrid suggests thatP. alchemilloides with 2n = 16 may be of polyploid origin. The three species based on x = 11 appear to be more closely related to species from other sections ofPelargonium that have the same basic chromosome number and small chromosome size, rather than to other species of sect.Eumorpha.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00983688
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  • 6
    Electronic Resource
    Electronic Resource
    A reappraisal ofPelargonium sect.Ligularia (Geraniaceae) (1992)
    Springer
    Plant systematics and evolution 179 (1992), S. 257-276 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Geraniaceae ; Pelargonium ; Chromosome numbers ; karyotypes ; hybridization ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A study of 33 species ofPelargonium sect.Ligularia reveals four basic chromosome numbers, x = 8, 9, 10, and 11, and variation in chromosome size. From evidence of karyology and hybridization attempts, proposals are made to divide the section into smaller groups and to transfer some species to other sections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00937601
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  • 7
    Electronic Resource
    Electronic Resource
    Phylogenetic relationships withinPelargonium sect.Peristera (Geraniaceae) inferred from nrDNA and cpDNA sequence comparisons (1998)
    Springer
    Plant systematics and evolution 211 (1998), S. 273-287 
    Details
    ISSN: 1615-6110
    Keywords: Geraniaceae ; Pelargonium ; Peristera ; Phylogeny ; rDNA ITS ; trnL-F ; longrange dispersal ; South Africa ; Australia ; St. Helena ; Tristan da Cunha
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phylogenetic analysis of nrDNA ITS and trnL (UAA) 5′ exon-trnF (GAA) chloroplast DNA sequences from 17 species ofPelargonium sect.Peristera, together with nine putative outgroups, suggests paraphyly for the section and a close relationship between the highly disjunct South African and Australian species of sect.Peristera. Representatives fromPelargonium sectt.Reniformia, Ligularia s. l. andIsopetalum (the St. Helena endemicP. cotyledonis) appear to be nested within thePeristera clade. The close relationship between the South African and AustralianPeristera is interpreted as being caused by long-range dispersal to Australia, probably as recent as the late Pliocene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985364
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  • 8
    Electronic Resource
    Electronic Resource
    A trnL-F based phylogeny for species ofPelargonium (Geraniaceae) with small chromosomes (1999)
    Springer
    Plant systematics and evolution 216 (1999), S. 309-324 
    Details
    ISSN: 1615-6110
    Keywords: Geraniaceae ; Pelargonium ; Phylogeny ; trnL-F ; South Africa ; mediterranean climate ; xerophytic adaptation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phylogenetic analysis was performed of 921 positions of trnL (UAA) 5′ exon — trnF (GAA) exon chloroplast DNA regions from 68 representatives ofPelargonium sectt.Campylia, Cortusina, Glaucophyllum, Hoarea, Isopetalum, Ligularia, Otidia, Pelargonium, Peristera, Polyactium, andReniformia, together with five putative outgroup species from sectionsCiconium, Chorisma andJenkinsonia. The total data set therefore comprised 67.2 kb of DNA sequence. Two main ingroup clades were identified: one clade contains sectionsPeristera, Reniformia, andIsopetalum, the other contains sectionsCampylia, Cortusina, Glaucophyllum, Hoarea, Ligularia, Otidia, Pelargonium, Polyactium and two species currently grouped in sect.Peristera. Branching order among five main clades within the latter clade was not resolved. The trnL-F sequence data support monophyly only for sectionsReniformia andHoarea, the remainder of the currently recognized sections ofPelargonium being either paraphyletic or polyphyletic. The data further suggest that sect.Polyactium is diphyletic and that sect.Glaucophyllum is nested within sect.Pelargonium. One relatively derived clade, which represents half of the genus, contains predominantly geophytic and succulent species, occurring in the geographically restricted winter rainfall region of the South African Cape. This pattern is interpreted as reflecting explosive radiation, possibly as an adaptive response to recent aridification in the western Cape.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01084405
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  • 9
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    Pollen morphology of the genus Pelargonium (Geraniaceae) (1992)
    Elsevier
    Details
    Publication Date: 1992-04-01
    Print ISSN: 0034-6667
    Electronic ISSN: 1879-0615
    Topics: Geosciences
    Published by Elsevier
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  • 10
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    Genetic structure, reproductive biology and ecology of isolated populations of Asplenium csikii (Aspleniaceae, Pteridophyta) (1999)
    Springer Nature
    Details
    Publication Date: 1999-11-01
    Print ISSN: 0018-067X
    Electronic ISSN: 1365-2540
    Topics: Biology
    Published by Springer Nature
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