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Tumbleweed Invasion
A huge hybrid tumbleweed that can grow up to 6 feet in height is spreading across California, burying neighborhoods, causing traffic accidents and helping to spread wildfires.
Experts had predicted the hybrid would go extinct. But Salsola ryanii is now tumbling into new areas of California and could expand its territory even farther.
The thistle inherited extra sets of chromosomes from each parent, which scientists believe is why it has grown larger and more vigorous than either of its parents.
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