tickseed, name sometimes used for the bur marigold, coreopsis, tick trefoil or beggarweed, and other bur-producing weeds.

Tickseed is the common name for Coreopsis, a group of 35 species of herbs in the family Asteraceae and genus Coreopsis. Many of them are used in cultivation. 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 is derived from the Greek word koris, meaning bedbug, from the shape of the achene. The plants are also popularly called "Calliopsis."

Coreopsis species are used as food plants by the larvae of some Lepidoptera species including Coleophora acamtopappi.

Some Coreopsis species:

Coreopsis sect. Calliopsis
Coreopsis sect. Coreopsis
Coreopsis sect. Eublepharis
Coreopsis sect. Gyrophyllum
Coreopsis sect. Leptosyne
Coreopsis sect. Pugiopappus
Coreopsis sect. Silphidium
Coreopsis sect. Tuckermannia

Coreopsis auriculata — Mouse-ear coreopsis.
Coreopsis basalis — goldenmane tickseed.
Coreopsis delphiniifolia
Coreopsis bigelovii — Bigelow's tickseed.
Coreopsis douglasii
Coreopsis calliopsidea
Coreopsis californica — California tickseed.
Coreopsis gigantea — Giant coreopsis.
Coreopsis gladiata — Coastalplain tickseed.
Coreopsis grandiflora — Largeflowered tickseed.
Coreopsis hamiltonii — Mount Hamilton tickseed.
Coreopsis integrifolia
Coreopsis intermedia
Coreopsis lanceolata — Lance-leaved Coreopsis, Tickseed.
Coreopsis latifolia
Coreopsis leavenworthii
Coreopsis linifolia — Texas tickseed.
Coreopsis major — Greater tickseed.
Coreopsis maritima
Coreopsis nudata
Coreopsis nuecensis — Crown tickseed.
Coreopsis palmata — Stiff tickseed.
Coreopsis pubescens
Coreopsis pulchra
Coreopsis rosea — Pink tickseed.
Coreopsis stillmanii
Coreopsis tinctoria — Plains coreopsis.
Coreopsis tripteris — Tall tickseed.
Coreopsis verticillata — Threadleaf coreopsis, Whorled coreopsis, Moonbeam coreopsis.
Coreopsis wrightii — rock tickseed.

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