Thin-Leafed Coneflower (Rudbeckia triloba)
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- Black-Eyed Susan
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.
- Tall Coreopsis
Tall coreopsis is generally much taller than the coneflower. The coreopsis has a three-part divided leaf, while the coneflower has a simple toothed leaf.