{"id":11664,"date":"2020-11-10T09:01:53","date_gmt":"2020-11-10T09:01:53","guid":{"rendered":"https:\/\/www.northafricatrees.org\/genus\/tamarix-l\/"},"modified":"2021-09-03T18:27:40","modified_gmt":"2021-09-03T18:27:40","slug":"tamarix-l","status":"publish","type":"genus","link":"https:\/\/www.northafricatrees.org\/fr\/genres\/tamarix-l\/","title":{"rendered":"Tamarix L."},"content":{"rendered":"<p>Genre comprenant environ 15 esp\u00e8ces dans le N. de l\u2019Afrique, \u00e0 aire de r\u00e9partition vaste dans toute la r\u00e9gion. Il s\u2019agit d\u2019un des genres pour lesquels l\u2019\u00e9tablissement d\u2019une nomenclature ad\u00e9quate s\u2019est r\u00e9v\u00e9l\u00e9e la plus probl\u00e9matique ; en effet, presque toutes ses esp\u00e8ces sont tr\u00e8s semblables et extraordinairement polymorphes. Plus de 30 esp\u00e8ces et sous-esp\u00e8ces diff\u00e9rentes ont \u00e9t\u00e9 d\u00e9crites dans la r\u00e9gion, ainsi qu\u2019une centaine de vari\u00e9t\u00e9s. Beaucoup de ces taxons suppos\u00e9s diff\u00e9rents correspondent en r\u00e9alit\u00e9 \u00e0 un unique taxon, d\u00e9crit sous des noms diff\u00e9rents par divers auteurs, ou par un m\u00eame auteur mais \u00e0 partir d\u2019\u00e9chantillons insuffisants. Il s\u2019est av\u00e9r\u00e9 impossible dans le cadre de ce projet d\u2019\u00e9tablir une diff\u00e9renciation claire entre <em>T. pauciovulata, T. trabutii<\/em> et <em>T. balansae<\/em>, tous les arbres examin\u00e9s pr\u00e9sentant des caract\u00e8res de ces 3 esp\u00e8ces, qui semblent en r\u00e9alit\u00e9 correspondre \u00e0 une seule pr\u00e9sent\u00e9e sous diff\u00e9rents noms : <strong>T. amplexicaulis<\/strong>. La monographie du genre r\u00e9alis\u00e9e par Baum (1978), d\u00e9j\u00e0 utilis\u00e9e dans <em>Flora of Libya<\/em>,<em> Flore de Mauritanie<\/em>,<em> Catalogue des plantes vasculaires de la Mauritanie et du Sahara occidental<\/em> et <em>Flora Iberica<\/em>, constitue une bonne base en vue d\u2019une r\u00e9vision du genre dans la r\u00e9gion.<\/p>\n<p>Un des caract\u00e8res les plus constants permettant une identification claire et rapide des esp\u00e8ces du genre <em>Tamarix<\/em> est le disque staminal, qui peut \u00eatre fondamentalement de 3 types suivant sa forme :<em> sinlophe<\/em>, \u00e0 disque profond\u00e9ment divis\u00e9 en lobules, desquels naissent les \u00e9tamines, sous forme d&rsquo;une prolongation qui permet \u00e0 peine de discerner o\u00f9 terminent les uns et o\u00f9 commencent les autres, ces derni\u00e8res semblant s\u2019\u00e9largir \u00e0 la base, au niveau de ce qui, en r\u00e9alit\u00e9, correspond d\u00e9j\u00e0 \u00e0 l\u2019apex du lobule ; <em>paralophe<\/em>, \u00e0 disque divis\u00e9 en lobules, sur l\u2019apex tronqu\u00e9 desquels la naissance des \u00e9tamines peut \u00eatre parfaitement observ\u00e9e ; et <em>hololophe<\/em>, \u00e0 disque divis\u00e9 en lobules, sur l\u2019apex desquels ne naissent pas les \u00e9tamines, ces derri\u00e8res naissant entre les lobules et non sur eux.<\/p>\n<p>N\u00e9anmoins, une confiance excessive en la stabilit\u00e9 de la morphologie du disque a donn\u00e9 lieu \u00e0 certaines des confusions les plus importantes faites sur ce genre. Il semble plus appropri\u00e9 de d\u00e9crire l\u2019insertion et de n\u2019op\u00e9rer \u00e0 une diff\u00e9renciation qu\u2019entre celles qui pr\u00e9sentent les filets dispos\u00e9s sur les lobules ou entre ses derniers. La diff\u00e9rence entre hololophe et paralophe d\u00e9pend parfois de l\u2019\u00ab\u00a0inspiration\u00a0\u00bb de la personne qui identifie le sp\u00e9cimen. En outre, ce caract\u00e8re est variable chez la plupart des esp\u00e8ces. Il est de plus quelquefois difficile de d\u00e9terminer si un disque est hololophe ou paralophe, certains \u00e9tant d\u00e9pourvus de lobules. Cela s\u2019av\u00e8re particuli\u00e8rement probl\u00e9matique dans le groupe de <em>T. nilotica<\/em>, <em>T. mannifera<\/em>, <em>T. arborea<\/em>, <em>T. arabica<\/em>, etc. que Zohary a regroup\u00e9 dans <em>T.<\/em> <em>nilotica<\/em>.<\/p>\n","protected":false},"template":"","class_list":["post-11664","genus","type-genus","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Tamarix L. - North Africa Trees<\/title>\n<meta name=\"robots\" content=\"noindex, follow\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tamarix L. - North Africa Trees\" \/>\n<meta property=\"og:description\" content=\"Genre comprenant environ 15 esp\u00e8ces dans le N. de l\u2019Afrique, \u00e0 aire de r\u00e9partition vaste dans toute la r\u00e9gion. 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