Heliopsis 'Summer Nights' (helianthoides) aka. Rough Heliopsis, False Sunflower
These yellow flowers (bush) are planted in the Main South Garden (MSG2021#08).
"Noted for its outstanding color and long bloom time. Summer Nights provides your garden with exceptional golden yellow daisy-like blooms with mahogany centers. Tall slender rich green stems with foliage tinged in red provide an interesting contrast. Attractive to butterflies and song-birds love the seed." -bluestoneperennials.com