New tumbleweed species is taking over California, Science
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Tumbleweeds - National Geographic Magazine
ARTIFACT: Tumbleweed - Borderlore
He's celebrated deserts all his life. Now he sounds the alarm - Los Angeles Times
Tumbleweeds - National Geographic Magazine
Monster Hybrid Tumbleweed Species Is Taking Over California, Scientists Warn
The iconic tumbleweed of the West is not native to North America.
Weed seed dispersal - real world - UC Weed Science - ANR Blogs
Russian Thistle Management Guidelines--UC IPM
Why do tumbleweeds tumble?
Giant tumbleweed seen blowing across Southern California road
Weed of the Month: Russian Thistle
What plants in North America do we not realize are invasive? - Quora
Tumbleweeds - National Geographic Magazine
Nonnative Species - Petrified Forest National Park (U.S. National Park Service)
More than 200 new species were discovered this year
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