{"id":10976,"date":"2020-11-10T08:58:22","date_gmt":"2020-11-10T08:58:22","guid":{"rendered":"https:\/\/www.northafricatrees.org\/family\/compositae-giseke-3\/"},"modified":"2021-08-08T08:16:56","modified_gmt":"2021-08-08T08:16:56","slug":"compositae-giseke-3","status":"publish","type":"family","link":"https:\/\/www.northafricatrees.org\/fr\/familles\/compositae-giseke-3\/","title":{"rendered":"COMPOSITAE Giseke"},"content":{"rendered":"<p>Il s\u2019agit de la plus importante famille de plantes vasculaires du Pal\u00e9arctique et de l\u2019une des plus importantes au monde, avec environ 1910 genres et 32\u00a0900 esp\u00e8ces. Elle est principalement compos\u00e9e d\u2019esp\u00e8ces herbac\u00e9es, les arbres, arbustes et esp\u00e8ces ligneuses y \u00e9tant rares. Elle est r\u00e9partie dans toute la plan\u00e8te, des montagnes arctiques aux for\u00eats tropicales. Toutes les esp\u00e8ces ont en commun le fait de pr\u00e9senter les fleurs r\u00e9unies en capitules entour\u00e9s d\u2019un involucre de bract\u00e9es, avec un r\u00e9ceptacle au sein duquel s\u2019ins\u00e8rent les fleurs plus ou moins \u00e9largi, plat ou convexe, pouvant \u00eatre alv\u00e9ol\u00e9 et pr\u00e9senter des poils ou \u00e9cailles entre les fleurs. Ces derni\u00e8res peuvent \u00eatre unisexu\u00e9es ou hermaphrodites et, chez les esp\u00e8ces nord-africaines, correspondre \u00e0 deux types\u00a0: les ligul\u00e9es et h\u00e9miligul\u00e9es, zygomorphes, qui pr\u00e9sentent les p\u00e9tales soud\u00e9s en un tube court dans la partie inf\u00e9rieure, et le reste en forme de languette \u00e0 5 dents (fleurs ligul\u00e9es proprement dites) ou \u00e0 3 dents (fleurs h\u00e9miligul\u00e9es), ou des fleurons actinomorphes qui pr\u00e9sentent une corolle tubuleuse \u00e0 5 dents apicales. L\u2019androc\u00e9e est form\u00e9 de 5 \u00e9tamines libres au niveau des filets mais \u00e0 anth\u00e8res coalescentes formant un tube plus ou moins longuement exserte qui entoure le style. Ovaire toujours inf\u00e8re et calice absent ou transform\u00e9 en un pappus form\u00e9 de poils, d\u2019\u00e9cailles ou d&rsquo;une couronne membraneuse. Le fruit est une cyps\u00e8le (ak\u00e8ne produit par un ovaire inf\u00e8re).<\/p>\n<p>Dans le N. de l&rsquo;Afrique, cette famille est repr\u00e9sent\u00e9e par 124 esp\u00e8ces, la plupart herbac\u00e9es. Les esp\u00e8ces des genres <strong>Pluchea<\/strong> et <strong>Warionia<\/strong> peuvent atteindre un port arborescent, mais toutes les esp\u00e8ces ligneuses sont g\u00e9n\u00e9ralement de petite taille, arbustes ou arbrisseaux. La cl\u00e9 suivante pr\u00e9tend inclure tous les genres nord-africains pr\u00e9sentant des esp\u00e8ces ligneuses, qu&rsquo;il s&rsquo;agisse d\u2019arbustes ou d&rsquo;arbrisseaux.<\/p>\n","protected":false},"template":"","class_list":["post-10976","family","type-family","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>COMPOSITAE Giseke - 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=\"COMPOSITAE Giseke - North Africa Trees\" \/>\n<meta property=\"og:description\" content=\"Il s\u2019agit de la plus importante famille de plantes vasculaires du Pal\u00e9arctique et de l\u2019une des plus importantes au monde, avec environ 1910 genres et 32\u00a0900 esp\u00e8ces. Elle est principalement compos\u00e9e d\u2019esp\u00e8ces herbac\u00e9es, les arbres, arbustes et esp\u00e8ces ligneuses y \u00e9tant rares. 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