Phragmites australis, seeds

The invasive reed Phragmites australis can create new plants through seeds (shown here) or underground rhizomes. Scientists at the Smithsonian Environmental Research Center have discovered that seeds are the primary method the plants have used to invade Chesapeake Bay wetlands.

A close-up photo of the seeds on the plant Phragmites australis.
Credit: 

Melissa McCormick