Some rare plants and animals have new invasive species to contend with in Saint John area wetlands, according to research from the Nature Conservancy of Canada. Reed canary grass was found in almost all of the 12 large coastal wetlands studied by the group over the past three summers, said conservation biologist Allison Patrick. As well, a plant called brass buttons, native to southern Africa and New Zealand, was found widespread in Red Head marsh and Musquash estuary.