Jan 28th 2014, 14:40, by Sarah Zhang
The tumbleweed, which seems so at home rolling down an American highway, is actually an invasive plant from the Russian steppes. In the relatively short time it's been invading the plains—just over a century—the tumbleweed has managed to establish itself as an indelible symbol of the western landscape. It is the ultimate sleeper cell, we might say, an enemy plant, if we were to resort to Cold War metaphors.
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