Podostemaceae

Les Podostemaceae (les Podostémacées) sont une famille de plantes à fleurs dicotylédones de l'ordre des Malpighiales qui comprend plus de 100 espèces en 29 à 50 genres.

Ce sont de plantes aquatiques, à port de mousses ou d'hépatiques, fixées aux rochers dans les eaux douces rapides, par des racines rampantes qui adhèrent au support. Les Podostémacées sont presque toutes propres aux eaux douces des pays tropicaux, particulièrement de l'Afrique. Le Podostémon Cératophylle (Podostemum ceratophyllum), du Québec, est la seule Podostémacée habitant la zone tempérée de l'hémisphère nord.

Elles sont plus ou moins « thalloïdes »[1], fixées par un haptère ou non, avec parfois des feuilles bien développées.

Étymologie

Le nom vient du genre type Podostemum, dérivé du grec ποδών / podon, pied, et de στεμα / stema, couronne, étamines, en référence aux fleurs qui se forment au bout de simples tiges.

Classification

La classification Cronquist situe cette famille dans l'ordre des Podostemales.

La classification phylogénétique l’inclus dans l'ordre des Malpighiales.

Le Angiosperm Phylogeny Website accepte 270 espèces réparties en 48 genres.

Liste des genres

Selon Angiosperm Phylogeny Website (25 mai 2010)[2] :


Selon NCBI (25 mai 2010)[3] :


Selon DELTA Angio (25 mai 2010)[4] :

Notes et références

  1. (en) Irmgard JÄGER-ZÜRN, « Morphology and morphogenesis of ensiform leaves, syndesmy of shoots and an understanding of the thalloid plant body in species of Apinagia, Mourera and Marathrum (Podostemaceae) », Botanical Journal of the Linnean Society, no 147,‎ , p. 47–71 (DOI 10.1111/j.1095-8339.2005.00361.x)
  2. Stevens, P. F. (2001 onwards). Angiosperm Phylogeny Website. Version 14, July 2017 [and more or less continuously updated since]." will do. http://www.mobot.org/MOBOT/research/APweb/, consulté le 25 mai 2010
  3. NCBI, consulté le 25 mai 2010
  4. DELTA Angio, consulté le 25 mai 2010

Liens externes

Sur les autres projets Wikimedia :

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