Black-Eyed Susan (Rudbeckia hirta)
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- Tall Coreopsis
Black-eyed Susan is normally less than three feet tall, while tall coreposis can be as much as eight feet tall. Leaves and stem of black-eyed Susan are hairy; those of tall coreopsis are smooth.
- Thin-Leafed Coneflower
Black-eyed Susan has a much larger flower. Thin-leafed coneflower grows in a cluster. Despite the common names, the disc ("eye") of the brown-eyed Susan (thin-leafed coneflower) is actually the darker of the two.