An analysis of morphological variation in Senecio cymbalaria (Asteraceae)
Senecio cymbalaria Pursh is an arctic-alpine perennial that exhibits a broad range of morphological variation and occurs in four disjunct regions within North America. In this study, a morphological analysis of herbarium material is undertaken to determine whether the observed morphological variatio...
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Language: | English |
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Canadian Science Publishing
1992
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Online Access: | http://dx.doi.org/10.1139/b92-039 http://www.nrcresearchpress.com/doi/pdf/10.1139/b92-039 |
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crcansciencepubl:10.1139/b92-039 2023-12-17T10:26:04+01:00 An analysis of morphological variation in Senecio cymbalaria (Asteraceae) Whitton, Jeannette Bain, John F. 1992 http://dx.doi.org/10.1139/b92-039 http://www.nrcresearchpress.com/doi/pdf/10.1139/b92-039 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Botany volume 70, issue 2, page 285-290 ISSN 0008-4026 Plant Science journal-article 1992 crcansciencepubl https://doi.org/10.1139/b92-039 2023-11-19T13:39:40Z Senecio cymbalaria Pursh is an arctic-alpine perennial that exhibits a broad range of morphological variation and occurs in four disjunct regions within North America. In this study, a morphological analysis of herbarium material is undertaken to determine whether the observed morphological variation is primarily attributable to morphological discontinuities among geographically isolated groups. Eighty individuals representing the total geographic range of the species were scored for 24 morphological characters and the data matrix subjected to principal components and cluster analyses. Individuals from the southern Rocky Mountains, previously recognized as Senecio conterminus, are separated from the remainder of S. cymbalaria in both analyses. Our results support recognition of two species, S. conterminus and S. cymbalaria. Although populations from the Gaspé and from Newfoundland form somewhat distinct clusters, neither can clearly be distinguished from populations of S. cymbalaria from Alaska, the Yukon, and Northwest Territories. Chromosome counts of 2n = 138 were obtained from two individuals from the Gaspé peninsula. Key words: biogeography, phenetics, Gulf of St. Lawrence, Senecio, disjunction, chromosome numbers. Article in Journal/Newspaper Arctic Newfoundland Northwest Territories Alaska Yukon Canadian Science Publishing (via Crossref) Arctic Yukon Northwest Territories Canadian Journal of Botany 70 2 285 290 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Plant Science |
spellingShingle |
Plant Science Whitton, Jeannette Bain, John F. An analysis of morphological variation in Senecio cymbalaria (Asteraceae) |
topic_facet |
Plant Science |
description |
Senecio cymbalaria Pursh is an arctic-alpine perennial that exhibits a broad range of morphological variation and occurs in four disjunct regions within North America. In this study, a morphological analysis of herbarium material is undertaken to determine whether the observed morphological variation is primarily attributable to morphological discontinuities among geographically isolated groups. Eighty individuals representing the total geographic range of the species were scored for 24 morphological characters and the data matrix subjected to principal components and cluster analyses. Individuals from the southern Rocky Mountains, previously recognized as Senecio conterminus, are separated from the remainder of S. cymbalaria in both analyses. Our results support recognition of two species, S. conterminus and S. cymbalaria. Although populations from the Gaspé and from Newfoundland form somewhat distinct clusters, neither can clearly be distinguished from populations of S. cymbalaria from Alaska, the Yukon, and Northwest Territories. Chromosome counts of 2n = 138 were obtained from two individuals from the Gaspé peninsula. Key words: biogeography, phenetics, Gulf of St. Lawrence, Senecio, disjunction, chromosome numbers. |
format |
Article in Journal/Newspaper |
author |
Whitton, Jeannette Bain, John F. |
author_facet |
Whitton, Jeannette Bain, John F. |
author_sort |
Whitton, Jeannette |
title |
An analysis of morphological variation in Senecio cymbalaria (Asteraceae) |
title_short |
An analysis of morphological variation in Senecio cymbalaria (Asteraceae) |
title_full |
An analysis of morphological variation in Senecio cymbalaria (Asteraceae) |
title_fullStr |
An analysis of morphological variation in Senecio cymbalaria (Asteraceae) |
title_full_unstemmed |
An analysis of morphological variation in Senecio cymbalaria (Asteraceae) |
title_sort |
analysis of morphological variation in senecio cymbalaria (asteraceae) |
publisher |
Canadian Science Publishing |
publishDate |
1992 |
url |
http://dx.doi.org/10.1139/b92-039 http://www.nrcresearchpress.com/doi/pdf/10.1139/b92-039 |
geographic |
Arctic Yukon Northwest Territories |
geographic_facet |
Arctic Yukon Northwest Territories |
genre |
Arctic Newfoundland Northwest Territories Alaska Yukon |
genre_facet |
Arctic Newfoundland Northwest Territories Alaska Yukon |
op_source |
Canadian Journal of Botany volume 70, issue 2, page 285-290 ISSN 0008-4026 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/b92-039 |
container_title |
Canadian Journal of Botany |
container_volume |
70 |
container_issue |
2 |
container_start_page |
285 |
op_container_end_page |
290 |
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1785577756751298560 |