Coreopsideae

Coreopsideae is a tribe of flowering plants in the family Asteraceae, subfamily Asteroideae. It contains several genera, including Coreopsis (tickseed), Bidens (beggarticks), Cosmos, and Thelesperma. The group is primarily native to the Americas, with most diversity in North and Central America; many species are cultivated ornamentals and have become naturalized in other regions.

Description: Members of Coreopsideae are mostly herbaceous annuals or perennials. They produce the characteristic composite flower heads of the Asteraceae, with ray and disk florets in many species. Leaves are typically simple and can be opposite or alternate, depending on genus. The fruits are generally achenes, often with a small pappus that facilitates wind dispersal in some species.

Ecology and use: Several species are cultivated for their bright flowers and long blooming period, and they are attractive to pollinators such as bees and butterflies. In wild settings, they can be found in meadows, prairies, and disturbed habitats.

Taxonomy: Coreopsideae has undergone revisions in light of molecular phylogenetics, which support its status as a coherent group within the Asteroideae. The exact generic composition has varied as researchers reassign genera based on genetic data.