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  • 1
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    Taxonomy and pollen morphology of the Caltha leptosepala complex (1969)
    In:  Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht (2352-5754) vol.312 (1969) nr.1 p.16
    Details
    Publication Date: 2015-05-08
    Description: Contrary to Europe, with only one Caltha species, North America has at least three species of this genus. These are the polymorphic C. palustris L., also widely distributed in Europe, the floating aquatic C. natans Pall, and the polymorphic C. leptosepala-biflora group. Two previous papers (Smit 1967, 1968) dealt with taxonomic aspects of C. palustris, that in North America were not essentially different from those of European material.
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 2
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    A revision of Caltha (Ranunculaceae) (1973)
    In:  Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht (2352-5754) vol.398 (1973) nr.1 p.119
    Details
    Publication Date: 2015-05-08
    Description: The family of the Ranunculaceae, although a large one (ca. 1200 species) occurring almost throughout the world, is generally regarded as a very natural one. The only genera with a recently more or less disputed position are Circaeaster, Glaucidiutn, Hydrastis, Kingdonia, and Paeonia. The others may at present all be considered to be ‘true’ Ranunculaceae. Various botanists have studied the delimitation of these genera, their affinity and phylogenetic links. Their ideas are often widely divergent. There is no need to go into the subject here, but some opinions on the place in the system of Caltha may be reviewed.
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 3
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    Taxonomical and ecological studies in Caltha palustris L. II (1968)
    In:  Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht (2352-5754) vol.311 (1968) nr.1 p.280
    Details
    Publication Date: 2015-05-08
    Description: At least some of the species of the genus Caltha are polymorphic, showing not only a wide range of intraspecific morphological variation, but also considerable cytotaxonomic differentiation. A number of taxonomic problems are connected with this phenomenon. In a previous paper (Smit, 1967) a survey of the chromosome numbers of 46 Dutch populations was given. Two cytotypes of Caltha palustris were found, 2n = 32 and 2n = 56, respectively, with slight morphological differences and different ecological preferences.
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 4
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    Taxonomical and ecological studies in Caltha palustris L. (preliminary report) (1967)
    In:  Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht (2352-5754) vol.278 (1967) nr.1 p.500
    Details
    Publication Date: 2015-05-08
    Description: The genus Caltha comprises approximately 12-16 species growing in wet, marshy places in arctic and North and South temperate regions. The genus in classed in the tribe Helleboreae of the Ranunculaceae. A. de Candolle (1818) subdivided the genus into two sections: Psychrophila and Populago, the distinguishing features being that in the former the calyx is persistent, the auricles of the leaf laminae having upturned to erect appendages, whereas in the latter the calyx is deciduous and the leaves are cordate to reniform. In the section Psychrophila he placed two species of the Southern Hemisphere, the other section including all the species of the Northern Hemisphere. The peculiar leaf characters of the species of the Southern Hemisphere (5-8) are highly distinctive. Not only the morphological characters of some species of the genus vary considerably, but also in terms of cytology differentiation within the genus and even within species occurs. Therefore, various authors differ in that opinion with regard to the taxonomic treatment of the many forms.
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 5
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    A revision of Caltha (Ranunculaceae) (1973)
    In:  Blumea: Biodiversity, Evolution and Biogeography of Plants vol. 21 no. 1, pp. 121-150
    Details
    Publication Date: 2024-01-12
    Description: The family of the Ranunculaceae, although a large one (ca. 1200 species) occurring almost throughout the world, is generally regarded as a very natural one. The only genera with a recently more or less disputed position are Circaeaster, Glaucidium, Hydrastis, Kingdonia, and Paeonia. The others may at present all be considered to be \xe2\x80\x98true\xe2\x80\x99 Ranunculaceae.\nVarious botanists have studied the delimitation of these genera, their affinity and phylogenetic links. Their ideas are often widely divergent. There is no need to go into the subject here, but some opinions on the place in the system of Caltha may be reviewed.
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 6
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    Taxonomical and ecological studies in Caltha palustris L. (preliminary report) (1967)
    In:  Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht vol. 278 no. 1, pp. 500-510
    Details
    Publication Date: 2024-01-12
    Description: The genus Caltha comprises approximately 12-16 species growing in wet, marshy places in arctic and North and South temperate regions. The genus in classed in the tribe Helleboreae of the Ranunculaceae. A. de Candolle (1818) subdivided the genus into two sections: Psychrophila and Populago, the distinguishing features being that in the former the calyx is persistent, the auricles of the leaf laminae having upturned to erect appendages, whereas in the latter the calyx is deciduous and the leaves are cordate to reniform. In the section Psychrophila he placed two species of the Southern Hemisphere, the other section including all the species of the Northern Hemisphere. The peculiar leaf characters of the species of the Southern Hemisphere (5-8) are highly distinctive.\nNot only the morphological characters of some species of the genus vary considerably, but also in terms of cytology differentiation within the genus and even within species occurs. Therefore, various authors differ in that opinion with regard to the taxonomic treatment of the many forms.
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 7
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    A revision of Caltha (Ranunculaceae) (1973)
    In:  Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht vol. 398 no. 1, pp. 119-150
    Details
    Publication Date: 2024-01-12
    Description: The family of the Ranunculaceae, although a large one (ca. 1200 species) occurring almost throughout the world, is generally regarded as a very natural one. The only genera with a recently more or less disputed position are Circaeaster, Glaucidiutn, Hydrastis, Kingdonia, and Paeonia. The others may at present all be considered to be \xe2\x80\x98true\xe2\x80\x99 Ranunculaceae.\nVarious botanists have studied the delimitation of these genera, their affinity and phylogenetic links. Their ideas are often widely divergent. There is no need to go into the subject here, but some opinions on the place in the system of Caltha may be reviewed.
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 8
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    Taxonomy and pollen morphology of the Caltha leptosepala complex (1969)
    In:  Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht vol. 312 no. 1, pp. 16-27
    Details
    Publication Date: 2024-01-12
    Description: Contrary to Europe, with only one Caltha species, North America has at least three species of this genus. These are the polymorphic C. palustris L., also widely distributed in Europe, the floating aquatic C. natans Pall, and the polymorphic C. leptosepala-biflora group.\nTwo previous papers (Smit 1967, 1968) dealt with taxonomic aspects of C. palustris, that in North America were not essentially different from those of European material.
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 9
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    Taxonomical and ecological studies in Caltha palustris L. II (1968)
    In:  Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht vol. 311 no. 1, pp. 280-292
    Details
    Publication Date: 2024-01-12
    Description: At least some of the species of the genus Caltha are polymorphic, showing not only a wide range of intraspecific morphological variation, but also considerable cytotaxonomic differentiation. A number of taxonomic problems are connected with this phenomenon.\nIn a previous paper (Smit, 1967) a survey of the chromosome numbers of 46 Dutch populations was given. Two cytotypes of Caltha palustris were found, 2n = 32 and 2n = 56, respectively, with slight morphological differences and different ecological preferences.
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 10
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    De dotterbloem in Nederland (1970)
    In:  Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland vol. 5 no. 1, pp. 10-15
    Details
    Publication Date: 2024-01-12
    Description: 515 specimens of the polymorphic species Caltha palustris from 55 Dutch localities were studied morphologically and cytologically. Two cytotypes could be distinguished, a cytotype with 32 chromosomes and another with 56 chromosomes. These two cytotypes have slight morphological differences and different ecological preferences which although incompatible in crosses are insufficient for distinguishing separate species or even subspecies. The studies lead us to the conclusion that Caltha palustris is a species with large genecological differentiation in its populations. The intraspecific polyploidy, which could have arisen by mutations, will have enhanced the polymorphism of the species, resulting in series of more or less discontinuous ecotypes with associated morphological characteristics.\nSome populations of Caltha were rooting at the nodes of their stems, a manner of vegetative propagation; they are treated as a variety of Caltha palustris: C. palustris L. var. radicans (Forst.) Beck.
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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