Coreopsis (pronounced /ˌkɒriˈɒpsɨs/;[1] common names include tickseed and calliopsis) is a genus of herbs in the family Asteraceae. Many of its 35 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. The name Coreopsis is derived from the Greek word koris, meaning bedbug, referring to the shape of the achene.
Coreopsis species are used as food plants by the larvae of some Lepidoptera species including Coleophora acamtopappi.
Coreopsis is closely related to Bidens. In fact, neither Coreopsis nor Bidens, as defined in the 20th century, is monophyletic. One group which does seem to be monophyletic consists of temperate species from North America, including five sections of Coreopsis, Bidens coronata and Bidens comosa, and the genus Thelesperma (five species).[2]
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