Tumbleweed
| Salsola | ||||||||||||||
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 Salsola oppositifolia | ||||||||||||||
| Scientific classification | ||||||||||||||
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| Species | ||||||||||||||
About 100-130 species; see text. |
Salsola (also known as Tumbleweed, Saltwort, or Russian thistle) is a genus of herbs, subshrubs, shrubs, and small trees in the family Chenopodiaceae, native to Africa, Asia, and Europe; they typically grow on flat, often dry and/or somewhat saline soils, with some species in saltmarshes. Recent genetic studies have however shown that the genus as traditionally circumscribed is paraphyletic, and many species are likely to be transferred to other genera in the future.
In several annual species, those known popularly as "tumbleweeds", the plants break away from their roots in the autumn, and are driven by the wind as a light, rolling mass, scattering seed far and wide. The seeds are produced in large numbers and do not have a protective coating or food reserves for the coiled plant embryos. The deep, ineradicable taproot that remains in the ground survives to grow again the following season.
The genus Batis is also sometimes known as Saltwort but is unrelated to salsola.
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