Common name: false sunflower, oxeye sunflower, smooth oxeye, Sunflower Heliopsis. Scientific name: Heliopsis helianthoides. Family: Asteraceae. Genus: Heliopsis. Plant type: Perennials. Flower color: yellow. Height: up to 5 ft (1.5 m) tall. Flowering time: Summer. leaves: dark green,ovate.