A reader sent in this photo of Phragmites australis, aka Phragmites, aka Common Reed, from a southern New England marsh yesterday. This presumably non-native, invasive reed has spread like a cancer in marshes across the US, crowding out native marsh species and, in many areas, creating hundreds or thousands of acres of sterile "monoculture" marshland (eg the vast and once-biologically-bountiful New Jersey marshlands).
(There is a native species of Phragmites, shorter, far less aggressive, and pickier of habitat. I took a photo of a stand of it in Canada, but can't find my photo. Here's a genetic study of Phragmites species in North America.)
Ducks Unlimited has many programs, such as this one, to try to control these weed reeds. Nonetheless, they are here to stay. Illegal immigration or globalization?