[article] Titre : | Hybrids within Equisetum subgenus Hippochaete in England and Wales | Type de document : | périodique | Auteurs : | P. Jepson, Auteur ; Markus Lubienski, Auteur ; Peter Llewellyn, Auteur ; Ronald Viane, Auteur | Année de publication : | 2013 | Article en page(s) : | pp. 47-58 | Langues : | Anglais | Catégories : | [ZG] Royaume-Uni [Espèces (in biblio)] Equisetum [Espèces (in biblio)] Equisetum ramosissimum Desf. [Espèces (in biblio)] Equisetum x meridionale [Espèces (in biblio)] Equisetum x trachyodon
| Résumé : | "Hybrid horsetails in Equisetum subgenus Hippochaete are superficially similar. Distinguishing the different taxa depends on the micromorphology of the stem ridges. In the case of the hybrids E. ×trachyodon (E. hyemale×E. variegatum) and E. ×meridionale (E. ramosissimum×E. variegatum) both inherit silica tubercles that run vertically along the stem ridges but only E. ×meridionale has silica cross-bands on the stem ridges; these are difficult to discern in the field, even with a ×20 hand-lens and good light. The past misidentification of some populations of E. ×meridionale as E. ×trachyodon in the British Isles is therefore understandable. Recorded populations of E. ×trachyodon in England are re-assessed, with some found to be E. ×meridionale. Associated species and habitats are compared. Using flow cytometry, all known British populations of E. ×meridionale were determined to be diploid. An identification key which incorporates recent knowledge of the morphology of the species and hybrids in subgenus Hippochaete in Europe is presented." (source : auteurs) | Type de publication : | article de livre | Référence biblio : | Jepson P., Lubienski M., Llewellyn P., Viane R., 2013 - Hybrids within Equisetum subgenus Hippochaete in England and Wales. In : . [s.l.], 47-58. | ID PMB : | 57093 | DOI : | 10.1179/2042349712Y.0000000017 | Permalink : | http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=57093 | in New Journal of botany > vol. 3, n°1 (Année 2013) . - pp. 47-58
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