"Jethro Tull" Tickseed Coreopsis in the main south garden. Coreopsis, common names include tickseed and calliopsis, is a genus of herbs in the family Asteraceae. This group of plants is related to sunflower. Many of its 35 to 114 species are cultivated. Twenty-eight species are native to North America and the others come from Central and South America. The flowers are usually yellow with a toothed tip. They have showy flower heads with involucral bracts in two distinct series of eight each, the outer being commonly connate at the base. (Wikipedia)