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Un virevoltant [1] ou tumbleweed (herbe qui roule en anglais) est, chez certaines plantes, la partie hors du sol qui, une fois mûre et sèche, se sépare de l'appareil végétatif souterrain (le plus souvent le système racinaire) avant de rouler sur le sol au gré du vent, ce qui constitue un cas de migration d’une espèce ...
A tumbleweed is a structural part of the above-ground anatomy of a number of species of plants. It is a diaspore that, once mature and dry, detaches from its root or stem and rolls due to the force of the wind.
30 oct. 2022 · En 150 ans, le “tumbleweed”, cette boule végétale, qui roule dans les déserts et les zones semi-arides, a fini par s’implanter sur presque tout le territoire nord-américain.
7 févr. 2022 · Learn how tumbleweeds, also known as Russian thistle, became a symbol of the American West and a problematic invasive species. Discover their life cycle, spread, impact and management options.
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Get a new perspective on our place in the universe and meet extraordinary new friends. Explore big scientific mysteries by going incredibly small. Tumbleweeds might be the iconic props of classic...
6 mai 2018 · Learn how tumbleweeds, also known as Russian thistle, evolved to disperse their seeds by rolling and bouncing in the wind. Find out how they became a nuisance and a threat in California and other western states.
