{"id":11085,"date":"2020-11-10T09:01:15","date_gmt":"2020-11-10T09:01:15","guid":{"rendered":"https:\/\/www.northafricatrees.org\/genus\/helichrysum-mill\/"},"modified":"2021-09-10T10:45:49","modified_gmt":"2021-09-10T10:45:49","slug":"helichrysum-mill","status":"publish","type":"genus","link":"https:\/\/www.northafricatrees.org\/fr\/genres\/helichrysum-mill\/","title":{"rendered":"Helichrysum Mill."},"content":{"rendered":"<p>Genre comprenant environ 500 esp\u00e8ces, la plupart de l&rsquo;Ancien Monde, mais qui s&rsquo;\u00e9tendent au S.-E. jusqu&rsquo;en Australie. Dans le N. de l\u2019Afrique, il est repr\u00e9sent\u00e9 par 6-10 esp\u00e8ces, pr\u00e9sentant la plupart une aire de r\u00e9partition vaste dans les r\u00e9gions m\u00e9diterran\u00e9enne et macaron\u00e9sienne. Bien que certaines esp\u00e8ces soient des h\u00e9micryptophytes peu ou pas ligneuses, comme <em>H. lacteum<\/em> Coss. &amp; Durieu (incl. <em>H. raynalianum<\/em> Qu\u00e9zel), du Maroc de l\u2019Alg\u00e9rie et de la Libye, ou <em>H. glumaceum<\/em> DC., \u00e0 aire de r\u00e9partition tropicale qui s\u2019\u00e9tend au N. jusqu\u2019au Maroc, il s\u2019agit habituellement de plantes \u00e0 tiges ligneuses \u00e0 la base qui ne d\u00e9passent que rarement 60\u00a0cm de haut. De nombreuses esp\u00e8ces ont \u00e9t\u00e9 cit\u00e9es dans le N. de l\u2019Afrique, mais des \u00e9tudes r\u00e9centes regroupent les ligneuses en seulement 4 esp\u00e8ces. Ici, nous d\u00e9crirons la plus commune, <strong>H. stoechas<\/strong>, les 3 autres sont :<\/p>\n<p><strong> H. italicum<\/strong> (Roth) G.Don f. est une plante qui se diff\u00e9rencie par son port dress\u00e9 et \u00e9lev\u00e9 (jusqu\u2019\u00e0 80\u00a0cm), \u00e0 feuilles plus longues, de 30-60\u00a0mm, involucre cylindrique de seulement 2-4\u00a0mm de large, et bract\u00e9es tr\u00e8s imbriqu\u00e9es, les externes plus dures, coriaces. Esp\u00e8ce de grande variabilit\u00e9 infrasp\u00e9cifique. Aujourd\u2019hui, des esp\u00e8ces telles que <em>H. serotinum<\/em> Boiss. &amp; Reut. et <em>H. picardii<\/em> Boiss. &amp; Reut. sont incluses au sein de cette variabilit\u00e9.<\/p>\n<p><strong> H. pendulum<\/strong> C. Presl. pr\u00e9sente les involucres subglobuleux comme <em>H. stoechas<\/em>, mais se diff\u00e9rencie des esp\u00e8ces pr\u00e9c\u00e9dentes par le tomentum dense de poils blancs qui recouvre les tiges et les deux faces des feuilles, donnant \u00e0 la plante un aspect blanch\u00e2tre. Elle pr\u00e9sente \u00e9galement une grande complexit\u00e9, mais certains auteurs (Crespo &amp; Mateo) ont d\u00e9j\u00e0 propos\u00e9 en 2010 d\u2019inclure 2 esp\u00e8ces pr\u00e9sentes dans le N. de l&rsquo;Afrique (<em>H. fontanesii<\/em> Cambess. et <em>H. boissieri<\/em> Nyman) au sein de la variabilit\u00e9 infrasp\u00e9cifique de <em>H. pendulum<\/em>, ce qui a \u00e9t\u00e9 confirm\u00e9 \u00e0 posteriori par des \u00e9tudes g\u00e9n\u00e9tiques (Herrando-Moraira <em>et al<\/em>., 2017).<\/p>\n<p><strong> H. orientale<\/strong> (L.) Vaill. se diff\u00e9rencie par son aspect blanch\u00e2tre, ses feuilles oblongues-lanc\u00e9ol\u00e9es \u00e0 spatul\u00e9es, planes, \u00e0 bord non r\u00e9volut\u00e9 et ligules tr\u00e8s pro\u00e9minentes (elles sont \u00e0 peine visibles chez les autres esp\u00e8ces nord-africaines). Esp\u00e8ce de la M\u00e9diterran\u00e9e orientale, de la Gr\u00e8ce \u00e0 l\u2019\u00c9gypte et provinces littorales et sublittorales d\u2019Asie, entre la Turquie et la Palestine.<\/p>\n<p>Esp\u00e8ces \u00e0 aires de r\u00e9partition diverses, mais aucune d\u2019elles ne semble menac\u00e9e.<\/p>\n<p>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.<\/p>\n","protected":false},"template":"","class_list":["post-11085","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>Helichrysum Mill. - 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=\"Helichrysum Mill. - North Africa Trees\" \/>\n<meta property=\"og:description\" content=\"Genre comprenant environ 500 esp\u00e8ces, la plupart de l&rsquo;Ancien Monde, mais qui s&rsquo;\u00e9tendent au S.-E. jusqu&rsquo;en Australie. 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