Edel Livermore, who is the 2013 Grand Harbor Volunteer of the Year & who took our class in 2011, brought a plant for ID to the Toni Robinson Waterfront Trail walk. Lo & behold, the plant, pictured above, was on the trail. It is False Oriental hawksbeard (Youngia japonica).
This annual or biennial plant reportedly re-seeds readily, often becoming a problem in nursery pots. It likes to ‘volunteer’ in yards.