| Titre : |
Identification and taxonomy of Betula (Betulaceae) in Great Britainand Ireland |
| Type de document : |
texte imprimé |
| Auteurs : |
Andy Amphlett, Auteur |
| Année de publication : |
2021 |
| Article en page(s) : |
pp. 99)135 |
| Langues : |
Anglais (eng) |
| Catégories : |
[Espèces (in biblio)] Betula
[Espèces (in biblio)] Betula nana
[Espèces (in biblio)] Betula pendula
[Espèces (in biblio)] Betula pubescens
[Thèmes] Morphologie végétale
|
| Mots-clés : |
hybridation comparaison d'espèces description botanique |
| Résumé : |
"Floras and identification guides typically do not list the full range of identification features that discriminate between Betula pendula Rothand B. pubescens Ehrh., and some accounts contain errors. Discriminatory identification features are described and illustrated. Introgression from the diploid, B. pendula into B. pubescens is widespread. It also occurs from B. nana L. into B. pubescens, but obviously introgressed examples of the latter are probably rare. Betula pubescens presents the greatest unresolved identification difficulties. Trees identified as B. pubescens subsp. celtiberica (Rothm. & Vasc.) Rivas Mart., particularly in Wales, may be part of the variation within British B. pubescens, due to introgression from B. pendula. The most widespread of the small-leaved forms of B. pubescens is correctly named var. fragrans Ashburner & McAll. Several misapplied names have been given to this taxon, most recently subsp. tortuosa (Ledeb.) Nyman, which does not occur in Europe. Not all small-leaved B. pubescens are var. fragrans; some examples show clear signs of introgression from B. nana, and may be referable to the northern var. pumila (L.) Govaerts." (source : auteur) |
| Type de publication : |
périodique |
| Référence biblio : |
Amphlett A., 2021 - Identification and taxonomy of Betula (Betulaceae) in Great Britainand Ireland. British & Irish Botany, 3 (2) : 99)135. |
| ID PMB : |
71541 |
| En ligne : |
https://britishandirishbotany.org/index.php/bib/article/view/84/114 |
| Format de la ressource électronique : |
document |
| Permalink : |
http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=71541 |
in British & Irish Botany > vol. 3, n°2 (Année 2021) . - pp. 99)135
Identification and taxonomy of Betula (Betulaceae) in Great Britainand Ireland in British & Irish Botany, vol. 3, n°2 (Année 2021)
