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Bigflower Coreopsis (Coreopsis grandiflora)

Bigflower Coreopsis or Largeflower tickseed
Coreopsis grandiflora
(Order Asterales, Family Asteraceae)

Coreopsis grandiflora in the field. Photo by Emmy Dudeck, 2013. 
(Kansas: Sedgwick County. Sedgwick County Zoo. Wichita. 37.72041°N 97.40810°W. June 25, 2013.)

Coreopsis grandiflora (Photo by Emmy Dudeck)

Height: Approximately 1-3 feet tall (30-90 cm)
Stems: Erect, usually clustered, slender, and slightly pubescent to glabrous.
Leaves: Simple, opposite, lobed or can be pinnately divided. 1-4 inches long, typically narrow with rounded ends, can be pubescent or glabrous.
Inflorescence: Heads are solitary and terminal on naked, long, stalks. 1.5-2 inches wide. Bracts are lanceolate in shape.
Flowers: Has ray and disk flowers. Ray flowers are typically ½ inch to 1 inch. Disk flowers have a 5 lobed corolla. All flowers are yellow in color. 
Fruits: Achenes, thin and flat, black, tipped with 2 short scales that enclose a small seed.

Flowering Phenology: May through July

Habitat: Mostly found in dry, open, sandy or calcareous hillsides, prairies, roadsides, or semi-disturbed areas.

Conservation Status: Not threatened

Native Status:  Native to the United States

Distribution of Coreopsis grandiflora.  Light green color indicates that the species is present and not rare; light brown indicates that the species is not present in the state:

Visitors: Coreopsis grandiflora attracts butterflies, possibly bees.

Uses:  Typically planted in gardens due to its showy inflorescence, but it can turn into a weedy species.  It is adventive in Arizona and California.

A gardener talking about bigflower tickseed. "Coreopsis grandiflora



Biota of North America Program:

KS Wildflower:


Great Plains Flora Association. 1986. Flora of the Great Plains. University Press of Kansas. Lawrence, Kansas. 915 pp.

Bare, Janet E. 1979. Wildflowers and Weeds of Kansas. The Reagents Press of Kansas. Lawrence, Kansas. 442 pp.

Archibald et al. 2005. Life history affects the evolution of reproductive isolation among species of Coreopsis. Evolution. The Society for the Study of Evolution. 2362-2369 pp.

Submitted by: Emmy Dudeck, July 2013.

Wichita State University
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