This shrub is in Riley Park between the parking area for the winter farmers' market and the market, so has been planted here, but I'm not sure by whom. I was going to post this for ID, had figured out that it was in the Asteraceae family, was looking at something with similar flowers but not a shrub. And then, I discovered in looking at the photos that some kind soul had labelled the plant! The labelling is not Parks Board work; I'm not sure if this is a community planting or what. The label at the ground in the first photo says Aster 'Lady in Black'. A query on that came up with Symphyotrichum lateriflorum 'Lady in Black'. Here is a description from Missouri Botanical Garden: Symphyotrichum lateriflorum 'Lady in Black' - Plant Finder