What you see are wild plants along the section of the Cape Cod Rail Trail (CCRT) While I was glad to not detect any poison ivy, these plants are invasive and are not native to New England. The two frail, barely visible weeds in the center, however, are very damaging to the soil and create an environment where only poison ivy can thrive.
I spotted very soil friendly clover along the trail. Areas near the parking lots were wisely mass planted with clover. Clover improves the quality of the soil and allows many species of plants to thrive.