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City life changes style of weed seeds

Urban living quickly drives a species of little yellow flower to make seeds that end up living with mom, say researchers in France.

A member of the dandelion family, Crepis sancta naturally produces two kinds of seeds. Most grow a miniature feather-duster that takes them wafting away on the breeze. The others, with no tuft, just fall off the mother plant to sprout nearby.

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