Taxonomy of the Poa laxa group, including two new taxa from Arctic Canada and Greenland, and Oregon, and a re‐examination of P. sect. Oreinos (Poaceae)

The Poa laxa Haenke species group, comprising four alpine – arctic taxa in P . sect. Oreinos , has a complicated and confusing taxonomic history. Here we re‐examine the taxonomy of the group and section based on sequences of three plastid and two nuclear ribosomal DNA markers. Poa laxa s.l. resolved...

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Published in:Nordic Journal of Botany
Main Authors: Soreng, R. J., Gillespie, L. J., Consaul, L. L.
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2017
Subjects:
Online Access:http://dx.doi.org/10.1111/njb.01507
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spelling crwiley:10.1111/njb.01507 2024-09-15T17:57:06+00:00 Taxonomy of the Poa laxa group, including two new taxa from Arctic Canada and Greenland, and Oregon, and a re‐examination of P. sect. Oreinos (Poaceae) Soreng, R. J. Gillespie, L. J. Consaul, L. L. 2017 http://dx.doi.org/10.1111/njb.01507 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fnjb.01507 https://onlinelibrary.wiley.com/doi/pdf/10.1111/njb.01507 en eng Wiley http://creativecommons.org/licenses/by/3.0/ Nordic Journal of Botany volume 35, issue 5, page 513-538 ISSN 0107-055X 1756-1051 journal-article 2017 crwiley https://doi.org/10.1111/njb.01507 2024-07-23T04:09:51Z The Poa laxa Haenke species group, comprising four alpine – arctic taxa in P . sect. Oreinos , has a complicated and confusing taxonomic history. Here we re‐examine the taxonomy of the group and section based on sequences of three plastid and two nuclear ribosomal DNA markers. Poa laxa s.l. resolved in a clade with species of sections Abbreviatae, Oreinos, Stenopoa , and Tichopoa . In the plastid analyses, Poa laxa s.s. (type of sect. Oreinos ) was placed in a subclade with P. glauca and other sect. Stenopoa species, while all other P. laxa s.l. taxa were placed in a subclade with species of sect. Abbreviatae . We maintain P. laxa s.s. (mainly 2n = 28) of west–central Europe in sect. Oreinos , while the other P. laxa s.l. taxa from northern Europe and North America (all 2n = 42 or higher ploid) are referred to P . sect. Abbreviatae . In North America only one collection of the northern European P. flexuosa subsp. flexuosa is accepted (Greenland, Jensen's Nunatakker), and P. flexuosa subsp. fernaldiana is accepted based on populations in eastern Canada and northeast USA. A new subspecies, P. flexuosa subsp. consauliae , is described from eastern Arctic Canada and Greenland its variable morphological characteristics suggest introgression with P. glauca and it is predicted to be apomictic. Rocky Mountain P. laxa subsp. banffiana is treated as P. banffiana . Oregon material formerly considered to belong to P. laxa s.l. is named P. wallowensis. Poa sect. Oreinos is thus found to be polyphyletic, and is here emended to comprise only three continental European species, including P. laxa . Lectotypes are designated for P. aspera var. laxiuscula, P. fernaldiana, P. flexuosa , and P. laxa var. debilior . New chromosome numbers are reported for P. flexuosa subsp. consauliae (ca 2n = 42), and P. glauca (2n = 63) from Baffin Island. A key to the species and subspecies found in North America is given. Article in Journal/Newspaper Baffin Island Baffin Greenland Wiley Online Library Nordic Journal of Botany 35 5 513 538
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description The Poa laxa Haenke species group, comprising four alpine – arctic taxa in P . sect. Oreinos , has a complicated and confusing taxonomic history. Here we re‐examine the taxonomy of the group and section based on sequences of three plastid and two nuclear ribosomal DNA markers. Poa laxa s.l. resolved in a clade with species of sections Abbreviatae, Oreinos, Stenopoa , and Tichopoa . In the plastid analyses, Poa laxa s.s. (type of sect. Oreinos ) was placed in a subclade with P. glauca and other sect. Stenopoa species, while all other P. laxa s.l. taxa were placed in a subclade with species of sect. Abbreviatae . We maintain P. laxa s.s. (mainly 2n = 28) of west–central Europe in sect. Oreinos , while the other P. laxa s.l. taxa from northern Europe and North America (all 2n = 42 or higher ploid) are referred to P . sect. Abbreviatae . In North America only one collection of the northern European P. flexuosa subsp. flexuosa is accepted (Greenland, Jensen's Nunatakker), and P. flexuosa subsp. fernaldiana is accepted based on populations in eastern Canada and northeast USA. A new subspecies, P. flexuosa subsp. consauliae , is described from eastern Arctic Canada and Greenland its variable morphological characteristics suggest introgression with P. glauca and it is predicted to be apomictic. Rocky Mountain P. laxa subsp. banffiana is treated as P. banffiana . Oregon material formerly considered to belong to P. laxa s.l. is named P. wallowensis. Poa sect. Oreinos is thus found to be polyphyletic, and is here emended to comprise only three continental European species, including P. laxa . Lectotypes are designated for P. aspera var. laxiuscula, P. fernaldiana, P. flexuosa , and P. laxa var. debilior . New chromosome numbers are reported for P. flexuosa subsp. consauliae (ca 2n = 42), and P. glauca (2n = 63) from Baffin Island. A key to the species and subspecies found in North America is given.
format Article in Journal/Newspaper
author Soreng, R. J.
Gillespie, L. J.
Consaul, L. L.
spellingShingle Soreng, R. J.
Gillespie, L. J.
Consaul, L. L.
Taxonomy of the Poa laxa group, including two new taxa from Arctic Canada and Greenland, and Oregon, and a re‐examination of P. sect. Oreinos (Poaceae)
author_facet Soreng, R. J.
Gillespie, L. J.
Consaul, L. L.
author_sort Soreng, R. J.
title Taxonomy of the Poa laxa group, including two new taxa from Arctic Canada and Greenland, and Oregon, and a re‐examination of P. sect. Oreinos (Poaceae)
title_short Taxonomy of the Poa laxa group, including two new taxa from Arctic Canada and Greenland, and Oregon, and a re‐examination of P. sect. Oreinos (Poaceae)
title_full Taxonomy of the Poa laxa group, including two new taxa from Arctic Canada and Greenland, and Oregon, and a re‐examination of P. sect. Oreinos (Poaceae)
title_fullStr Taxonomy of the Poa laxa group, including two new taxa from Arctic Canada and Greenland, and Oregon, and a re‐examination of P. sect. Oreinos (Poaceae)
title_full_unstemmed Taxonomy of the Poa laxa group, including two new taxa from Arctic Canada and Greenland, and Oregon, and a re‐examination of P. sect. Oreinos (Poaceae)
title_sort taxonomy of the poa laxa group, including two new taxa from arctic canada and greenland, and oregon, and a re‐examination of p. sect. oreinos (poaceae)
publisher Wiley
publishDate 2017
url http://dx.doi.org/10.1111/njb.01507
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fnjb.01507
https://onlinelibrary.wiley.com/doi/pdf/10.1111/njb.01507
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op_source Nordic Journal of Botany
volume 35, issue 5, page 513-538
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