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class="page-link" title="Abonnez-vous" data-loaded="true">3</a></li><li class="page-item "><a href="/abonnement" data-matomo-category="Article" data-matomo-name="Folio" data-matomo-value="page 4" class="page-link" title="Abonnez-vous" data-loaded="true">4</a></li><li class="page-item "><a href="/abonnement" data-matomo-category="Article" data-matomo-name="Folio" data-matomo-value="page 5" class="page-link" title="Abonnez-vous" data-loaded="true">5</a></li><li class="page-item "><a href="/abonnement" data-matomo-category="Article" data-matomo-name="Folio" data-matomo-value="page 6" class="page-link" title="Abonnez-vous" data-loaded="true">6</a></li></ul><p class="text-sm text-muted mb-1">Article modifié le <time datetime="2025-01-29"> 29/01/2025 </time></p><div class="content whole type-article" ><div class="block_1" data-ucode="yT322135_0"><i class="anchor" id="yT322135_0"></i><p> Nom donné, en morphologie florale, à une étamine transformée en une pièce stérile, c'est-à-dire dépourvue de sac pollinique, et qui prend souvent l'apparence d'une languette. On en trouve dans la <a data-bs-toggle="popover" data-bs-content="La fleur n'est pas un organe morphologiquement défini. Chez les Angiospermes les moins évoluées, la fleur est évidemment, comme Goethe lui-même l'avait découvert, un rameau feuillé (système d'axes foliarisés) très contracté, dans le prolongement de dispositifs déjà réalisés chez des Végétaux vasculaires archaïques (Coniférophytes, Cycadophytes et même Cryptogames vasculai..." title="Article : FLEUR" href="/encyclopedie/fleur/">fleur</a> de la consoude, du tilleul argenté, du cacaoyer par exemple. La fleur des cannas ne possède qu'une demi-étamine produisant du pollen ; l'autre moitié de cette étamine, ainsi que les cinq autres, sont transformées en staminodes, pièces rouges stériles que l'on prendrait à première vue pour les pétales ; les pétales proprement dits sont très réduits, les sépales aussi ; l'un des staminodes est même transformé en « labelle », accentuant la forte <a data-bs-toggle="popover" data-bs-content="Type de symétrie florale dans lequel les pièces sont symétriquement disposées par rapport à un plan. Les fleurs sont dites alors zygomorphes ou irrégulières par opposition aux fleurs actinomorphes. Ce plan de symétrie bilatérale peut contenir l'axe de l'inflorescence : la moitié droite de la fleur est symétrique de la moitié gauche (zygomorphie médiane ; exemples : le pois, la ..." title="Article : ZYGOMORPHIE" href="/encyclopedie/zygomorphie/">zygomorphie</a> de cette fleur, très adaptée à la fécondation par les insectes.</p><div class="clearfix"></div><p class="author"> — Jacques DAUTA</p><div class="clearfix"></div></div><div class="clearfix"></div></div><ul class="pagination justify-content-center public-links "><li class="page-item active"><a href="/abonnement" data-matomo-category="Article" data-matomo-name="Folio" data-matomo-value="page 1" class="page-link" title="Abonnez-vous" data-loaded="true">1</a></li><li class="page-item "><a href="/abonnement" data-matomo-category="Article" data-matomo-name="Folio" data-matomo-value="page 2" class="page-link" title="Abonnez-vous" data-loaded="true">2</a></li><li class="page-item "><a href="/abonnement" 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Tous droits de propriété industrielle et intellectuelle réservés.</p> </footer> <a href="javascript:" class="btn btn-primary" id="back-to-top" title="Retour en haut de page"><i aria-hidden="true" class="far fa-arrow-up"></i></a> <script> // noinspection ES6ConvertVarToLetConst,JSUnusedGlobalSymbols var subscription_uri = 'https://www.universalis.fr/abonnement/' bodyLoaded = true; loaded(); </script> <div class="modal" id="wd-help" tabindex="-1" style="display:none"> <div class="modal-dialog modal-xl"> <div class="modal-content"> <div class="modal-header"> <h5 class="modal-title">Aide</h5> <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button> </div> <div class="modal-body"> <p>L'outil Données Pays met à disposition un très grand nombre de données. Aussi, pour des raisons de performances et pour conserver une bonne expérience utilisateur, des règles de comparaison en nombre et en durée ont été mises en place :</p> <table class="table table-vcenter table-bordered table-sm"> <thead> <tr> <th>Pays</th> <th>Indicateurs</th> <th>Années</th> <th>Graphe</th> </tr> </thead> <tbody> <tr> <td>Jusqu'à 12 pays</td> <td>Toutes les données</td> <td>De 1960 à nos jours</td> <td> <ul class="list-unstyled m-0"> <li> <i class="fa fa-check text-success" aria-hidden="true"></i> <span class="visually-hidden">Affiché</span> en courbe </li> <li> <i class="fa fa-check text-success" aria-hidden="true"></i> <span class="visually-hidden">Affiché</span> en barre </li> </ul> </td> </tr> <tr> <td>De 13 à 50 pays</td> <td>5 données simultanées</td> <td>De 1960 à nos jours</td> <td> <ul class="list-unstyled m-0"> <li> <i class="fa fa-times text-danger" aria-hidden="true"></i> <span class="visually-hidden">Masqué</span> en courbe </li> <li> <i class="fa fa-check text-success" aria-hidden="true"></i> <span class="visually-hidden">Affiché</span> en barre </li> </ul> </td> </tr> <tr> <td>51 pays et plus</td> <td>1 seule donnée</td> <td>Sur une durée de 25 ans maximum</td> <td> <ul class="list-unstyled m-0"> <li> <i class="fa fa-times text-danger" aria-hidden="true"></i> <span class="visually-hidden">Masqué</span> en courbe </li> <li> <i class="fa fa-times text-danger" aria-hidden="true"></i> <span class="visually-hidden">Masqué</span> en barre </li> </ul> </td> </tr> </tbody> </table> <p>Lorsque la recherche porte sur <strong>une seule année</strong>, les résultats s’affichent sous forme de <strong>graphe en barre</strong>.</p> <p>Lorsque la recherche porte sur <strong>une période</strong>, les résultats s’affichent sous forme de <strong>graphe en courbe</strong>.</p> <p>Lorsque la recherche contient uniquement des données <strong>Informations générales</strong>, le champ <strong>Année ou période est désactivé</strong>, ces données ne possédant pas d'historique.</p> <p class="mb-0 text-sm text-muted text-end">v2.0</p> </div> </div> </div> </div> <script>(()=>{var e,a,r,_,c,d={},b={};function __webpack_require__(e){var a=b[e];if(void 0!==a)return a.exports;var r=b[e]={id:e,loaded:!1,exports:{}};return d[e].call(r.exports,r,r.exports,__webpack_require__),r.loaded=!0,r.exports}__webpack_require__.m=d,__webpack_require__.n=e=>{var a=e&&e.__esModule?()=>e.default:()=>e;return __webpack_require__.d(a,),a},__webpack_require__.d=(e,a)=>{for(var r in 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