I might have finally got this. The stems seem somewhat square and leaves are alternate, Lamiaceae-looking, but the flowers look like Asteraceae. What about Monarda fistulosa? Wild bergamot or bee balm, Lamiaceae. I started by querying bee balm four hours ago, but nothing came up that looked like this, so I went off in other directions. It's in an ornamental planting in the North Garden, not on my inventory listing.