The taxonomic status of Timmia sibirica
A critical study of the differentiating features of the North American populations of Timmia sibirica Lindb. et Arnell and T. norvegica Zett. reveals that populations with structure intermediate between these two taxa occur. Although from widespread localities, the intermediate specimens seem limite...
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Canadian Science Publishing
1981
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crcansciencepubl:10.1139/b81-081 2023-12-17T10:51:12+01:00 The taxonomic status of Timmia sibirica Horton, Diana G. 1981 http://dx.doi.org/10.1139/b81-081 http://www.nrcresearchpress.com/doi/pdf/10.1139/b81-081 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Botany volume 59, issue 5, page 563-571 ISSN 0008-4026 Plant Science journal-article 1981 crcansciencepubl https://doi.org/10.1139/b81-081 2023-11-19T13:38:58Z A critical study of the differentiating features of the North American populations of Timmia sibirica Lindb. et Arnell and T. norvegica Zett. reveals that populations with structure intermediate between these two taxa occur. Although from widespread localities, the intermediate specimens seem limited in number and T. sibirica and T. norvegica quite commnonly occur in mixed populations with no evidence of any intergradation. Therefore, it is concluded that the two taxa ought to be regarded as distinct species. The taxonomically important character-states of upper leaf cells and costa of T. sibirica. T. norvegica, and of the intermediate populations are illustrated with scanning elecron micrographs. The habitat of T. sibirica, like that of T. norvegica, is invariably on strongly calcareous substrates adjacent to waterfalls, along streams, or in low-lying tundra. The North American distribution of T. sibirica is mapped, including previously unreported localities as far south as 51° N in the Canadian Rocky Mountains. Article in Journal/Newspaper Tundra Canadian Science Publishing (via Crossref) Canadian Journal of Botany 59 5 563 571 |
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Canadian Science Publishing (via Crossref) |
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crcansciencepubl |
language |
English |
topic |
Plant Science |
spellingShingle |
Plant Science Horton, Diana G. The taxonomic status of Timmia sibirica |
topic_facet |
Plant Science |
description |
A critical study of the differentiating features of the North American populations of Timmia sibirica Lindb. et Arnell and T. norvegica Zett. reveals that populations with structure intermediate between these two taxa occur. Although from widespread localities, the intermediate specimens seem limited in number and T. sibirica and T. norvegica quite commnonly occur in mixed populations with no evidence of any intergradation. Therefore, it is concluded that the two taxa ought to be regarded as distinct species. The taxonomically important character-states of upper leaf cells and costa of T. sibirica. T. norvegica, and of the intermediate populations are illustrated with scanning elecron micrographs. The habitat of T. sibirica, like that of T. norvegica, is invariably on strongly calcareous substrates adjacent to waterfalls, along streams, or in low-lying tundra. The North American distribution of T. sibirica is mapped, including previously unreported localities as far south as 51° N in the Canadian Rocky Mountains. |
format |
Article in Journal/Newspaper |
author |
Horton, Diana G. |
author_facet |
Horton, Diana G. |
author_sort |
Horton, Diana G. |
title |
The taxonomic status of Timmia sibirica |
title_short |
The taxonomic status of Timmia sibirica |
title_full |
The taxonomic status of Timmia sibirica |
title_fullStr |
The taxonomic status of Timmia sibirica |
title_full_unstemmed |
The taxonomic status of Timmia sibirica |
title_sort |
taxonomic status of timmia sibirica |
publisher |
Canadian Science Publishing |
publishDate |
1981 |
url |
http://dx.doi.org/10.1139/b81-081 http://www.nrcresearchpress.com/doi/pdf/10.1139/b81-081 |
genre |
Tundra |
genre_facet |
Tundra |
op_source |
Canadian Journal of Botany volume 59, issue 5, page 563-571 ISSN 0008-4026 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/b81-081 |
container_title |
Canadian Journal of Botany |
container_volume |
59 |
container_issue |
5 |
container_start_page |
563 |
op_container_end_page |
571 |
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1785576380811968512 |