{"id":11343,"date":"2020-11-10T09:01:33","date_gmt":"2020-11-10T09:01:33","guid":{"rendered":"https:\/\/www.northafricatrees.org\/genus\/halimium-dunal-spach\/"},"modified":"2021-07-23T15:19:54","modified_gmt":"2021-07-23T15:19:54","slug":"halimium-dunal-spach","status":"publish","type":"genus","link":"https:\/\/www.northafricatrees.org\/fr\/genres\/halimium-dunal-spach\/","title":{"rendered":"Halimium (Dunal) Spach"},"content":{"rendered":"<p>Genre comprenant environ 13 esp\u00e8ces essentiellement r\u00e9parties dans la r\u00e9gion m\u00e9diterran\u00e9enne. Dans le N. de l\u2019Afrique, il est repr\u00e9sent\u00e9 par 8 esp\u00e8ces, toutes \u00e0 aire de r\u00e9partition m\u00e9diterran\u00e9enne. Pour certains auteurs, les diff\u00e9rences avec le genre <em>Cistus<\/em> sont minimes, et il conviendrait de l\u2019inclure dans ce dernier [par ex. Demoly (2006) et <em>ISFAN<\/em> (2011)]. N\u00e9anmoins, la d\u00e9nomination traditionnelle est maintenue dans le pr\u00e9sent projet, conform\u00e9ment \u00e0 l&rsquo;opinion d\u2019autres auteurs et de <em>The Plant List<\/em> (consult\u00e9e le 27-10-2017).<\/p>\n<p>Parmi les esp\u00e8ces d&rsquo;Afrique du Nord 5 peuvent \u00eatre consid\u00e9r\u00e9es comme plus ou moins arbustives, les autres 3 esp\u00e8ces ligneuses qui le composent, correspondant g\u00e9n\u00e9ralement \u00e0 des arbrisseaux d\u00e9passant \u00e0 peine 0,5\u00a0m de haut, ces derniers sont\u00a0:<\/p>\n<p><strong> H. calycinum <\/strong>(L.) K. Koch (<em>H. commutatum <\/em>Pau, <em>Cistus calycinus <\/em>L.), \u00e0 feuilles lin\u00e9aires, \u00e0 bord r\u00e9volut\u00e9 et uninerv\u00e9es, p\u00e9tales jaunes (2n\u00a0\u00a0=18);\u00a0 il s\u2019agit d\u2019une end\u00e9mique ib\u00e9ro-marocaine, abondante dans les syst\u00e8mes dunaires c\u00f4tiers et subc\u00f4tiers du N.-O. du Maroc, plus rare vers l\u2019int\u00e9rieur.<\/p>\n<p><strong> H. umbellatum <\/strong>(L.) Spach, \u00e0 feuilles lin\u00e9aires, \u00e0 bord r\u00e9volut\u00e9 et uninerv\u00e9es, p\u00e9tales blancs (2n\u00a0=\u00a018), \u00e0 aire de r\u00e9partition m\u00e9diterran\u00e9enne, bien qu\u2019elle semble absente en M\u00e9diterran\u00e9e centrale. Deux sous-esp\u00e8ces sont diff\u00e9renci\u00e9es\u00a0: dans le N. de l\u2019Afrique, la subsp. <strong>viscosum <\/strong>(Willk.) O.Bol\u00f2s &amp; Vigo, de 25-70\u00a0cm, assez visqueuse et \u00e0 poils \u00e9toil\u00e9s uniquement sur l\u2019envers des feuilles, mais sans poils sur leur endroit, les p\u00e9dicelles et les s\u00e9pales. Esp\u00e8ce de la M\u00e9diterran\u00e9e occidentale, dans le N. de l&rsquo;Afrique du Nord, elle appara\u00eet dans presque toute l\u2019aire m\u00e9diterran\u00e9enne du Maroc, de l\u2019Alg\u00e9rie et de la Tunisie.<\/p>\n<p><strong> H. atlanticum<\/strong> Humbert &amp; Maire, se caract\u00e9rise par ses graines tr\u00e8s villeuses, \u00e0 poils longs, son calice \u00e0 3 s\u00e9pales et ses p\u00e9tales jaunes. Esp\u00e8ce end\u00e9mique du Maroc, elle n\u2019est connue que dans les massifs du Tazekka (Moyen Atlas septentrional) et du Tidirhine (Rif central).<\/p>\n<p>Toutes ces esp\u00e8ces sont plus ou moins communes, \u00e0 exception de <em>H. atlanticum<\/em>, qui pr\u00e9sente en outre une aire de r\u00e9partition tr\u00e8s restreinte. Aucune de ces esp\u00e8ces n\u2019est actuellement \u00e9valu\u00e9e \u00e0 l\u2019\u00e9chelle mondiale dans la Liste rouge des esp\u00e8ces de l\u2019UICN. En Alg\u00e9rie, <em>H. umbellatum<\/em> est incluse dans la Liste des esp\u00e8ces v\u00e9g\u00e9tales non cultiv\u00e9es prot\u00e9g\u00e9es (d\u00e9cret ex\u00e9cutif 12-03 du 4 janvier 2012).<\/p>\n","protected":false},"template":"","class_list":["post-11343","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>Halimium (Dunal) Spach - 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=\"Halimium (Dunal) Spach - North Africa Trees\" \/>\n<meta property=\"og:description\" content=\"Genre comprenant environ 13 esp\u00e8ces essentiellement r\u00e9parties dans la r\u00e9gion m\u00e9diterran\u00e9enne. 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