Rudbeckia is also known commonly as black-eyed susan. It's quite invasive or at least aggressively spreading. Adjacent to the planting is a Shasta Daisy. A couple of them creeped into the Rudbeckia. I've included one to see if it works in the composition.
ALL in the Downs the fleet was moor’d,
The streamers waving in the wind,
When black-eyed Susan came aboard;
‘O! where shall I my true-love find?
Tell me, ye jovial sailors, tell me true 5
If my sweet William sails among the crew.’ John Gay