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Nombre de programmes trouvés : 10341

le (30m8s)

Poaceae or Grasses

Poaceae or Grasses are cosmopolitan. It is the first plant family by the spaces it covers: rice fields, cereal fields (Corn, Wheat), meadows, alpine and urban lawns, steppes, savannas, bamboo forests, reed beds (rich in reeds). Lawns are often mainly composed of Poaceae. It is the second family in number of species among Monocotyledons after Orchids. Poaceae contain 780 genera and about 12,000 species, 350 of which are in France, making them the second best represented family after Asteraceae or Compositae. But this family is above all ...
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le (26m22s)


To make the Lamiaceae family monophyletic, it was necessary to transfer 2/3 of the genera of Verbenaceae to it. Under these conditions, Lamiaceae become a relatively large cosmopolitan family with about 7000 species and 260 genders. More than 140 wild species of Lamiaceae grow in France. Lamiaceae are both herbaceous and woody plants. The White Lamium is the representative of the gender Lamium, a typical genus of the Lamiaceae family. The rod has clearly 4 angles, called quadrangular, collenchymal bundles at the angles allowing a rigid carrying. This is a common ...
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le (38m27s)


The Fabaceae are the 3rd family of Angiosperms in number of species (18 000 species, 630 genders) after Orchids and Asteraceae, and the second most important economic family after Poaceae. It is a cosmopolitan family, well represented in France (> 340 species including >335 faboideae). Woody Fabaceae predominate in warm regions. Herbaceous forms are common in temperate regions. The roots frequently have nodules, easily visible, corresponding to a symbiosis with bacteria of the gender Rhizobium, which reduce the atmospheric nitrogen N2 found in the soil to NH3 ...
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