Updated 05-May-2020.
Mondo shtuff from around the internet, all about COREOPSIS!
My botty best at summarizing from Wikipedia: Coreopsis is a genus of flowering plants in the family Asteraceae . common names include calliopsis and tickseed, a name shared with various other plants . the 75 to 80 Coreopsis species are native to north, central, and south america . they have showy flower heads with involucral bracts in two distinct series of eight each . the species is known to specifically provide food to caterpillars of some Lepidoptera species including Coleophora acamtopappi . the sunny, summer blooming, daisy-like flowers are popular in gardens Previously (1936) Coreopsis was classified into 11 sections and 114 species . the African species were subsequently reclassified as Bidens . 45 are in the 11 North American sections, and the remaining 35 are Deadheading the flowers ensures it does not become weedy . Using the USDA Hardiness Zones will identify what soil and climate is preferred for different cultivars or species . Notable species found in cultivation are C Anathysana (1) Coreopsis sect. Tuckermannia (2) Coreopsi sect . Leptosyne (3)Eastern North America coreopsis Sect. Silphidium (1) Core Coreopsis sect. (6) Calliopsis (3) Eublepharis (7)Coreopsis Sect. Eublephallum (syn. Palmatae) (6)Coropsis (6) & A.Gray – Leavenworth’s Tickseed Coreopsis paludosa M.E.Jones tinctoria Nutt . & S.F.B H.M.Hall – Douglas’s Tickseed Coreopsis californica (Nutt.) & Greenm. Coreopsis rudis (Benth.) Hemsl. A.Gray – Leafstem Tickseed Coreopsi hamiltonii (Elmer) H