Hamilton’s Kirkland and Rogers glens offer beautiful forest paths for joggers, dog-walkers and nature lovers. Hidden within the lush greenery, a well-trained eye can spot several plant species growing there that aren’t native to the glens. Invasive plant species in forests have the potential to interfere with native plants and animals, as well as disrupt the microbial balance of the soil. Five biology students and Professor Bill Pfitsch are mapping these unwelcome visitors in a summer research project.