Coreopsis leavenworthii Torr. & A. Gray
Leavenworth's Tickseed, Common Tickseed
Asteraceae (Aster Family)
Synonym(s): Coreopsis angustata, Coreopsis leavenworthii var. curtissii, Coreopsis leavenworthii var. garberi, Coreopsis leavenworthii var. lewtonii, Coreopsis lewtonii
USDA Symbol: COLE3
Common Tickseed is a member of the aster family (family Asteraceae) which includes herbs, sometimes shrubs or vines, rarely trees, with simple or compound, alternate or opposite leaves. Flowers small, but organized into larger heads resembling a single, radially symmetrical flower cupped by a ring of green bracts.
From the Image Gallery
Plant CharacteristicsDuration: Perennial
Size Notes: Up to about 5 feet tall, often much shorter.
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.
Bloom InformationBloom Color: Yellow , Brown
Bloom Time: Jan , Feb , Mar , Apr , May , Jun , Jul , Aug , Sep , Oct , Nov , Dec
Bloom Notes: Rays usually yellow throughout, rarely with proximal red-brown blotch. Flowers mostly May - July. May flower year-round.
DistributionUSA: AL , FL
National Wetland Indicator Status
Web ReferenceWebref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter
Research LiteratureReslit 428 - The plot thickens: does low density affect visitation and reproductive success in a perennial herb, and are these effects altered in the presence of a co-flowering species? (2008) T. S. Feldman
Reslit 305 - Phenotypic diversity of Coreopsis leavenworthii Torr. & Gray (Asteraceae) (2007) D. M. Czarnecki, II, J. G. Norcini and Z. N. Deng
Reslit 306 - Genetic diversity and differentiation among natural, production, and introduced populations of the narrowly endemic species Coreopsis leavenworthii (Asteraceae) (2008) D. M. Czarnecki, M. N. Rao, J. G. Norcini, F. G. G...
Reslit 707 - Temperature and light affects germination ecology of commercially produced seeds of Leavenworth's coreopsis (2007) S. M. Kabat, J. G. Norcini and B. Dehgan
Reslit 1006 - Harvest season and fertilizer effects on seed production of Leavenworth's coreopsis (2006) J. G. Norcini, J. H. Aldrich and F. G. Martini
Reslit 1311 - Increased seed set and inheritance of seed wings in interspecific crosses between Coreopsis tinctoria and Coreopsis leavenworthii (2008) S. Smith and Z. Deng
Reslit 1313 - Assessing pollen-mediated gene flow from Coreopsis tinctoria to Coreopsis leavenworthii using morphological markers (2008) S. Smith, Z. A. Deng, D. G. Clark and J. G. Norcin...
Reslit 1314 - Genetic Diversity of Natural Coreopsis leavenworthii Populations and Gene Flow from Coreopsis tinctoria (2010) S. M. Smith, D. M. Czarnecki and Z. N. Deng
Reslit 1343 - Phytotoxicity of Granular Formulations of Mesotrione, Pendimethalin + Dimethenamid-P and Sulfentrazone to Six Wildflowers (2009) R. H. Stamps and A. L. Chandler
Reslit 1933 - Comparative Capitular Morphology and Anatomy of Coreopsis L and Bidens L (Compositae), Including a Review of Generic Boundaries (1995) M. Tadesse, D. J. Crawford and E. B. Smith
This information was provided by the Florida WIldflower Foundation.
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Additional resourcesUSDA: Find Coreopsis leavenworthii in USDA Plants
FNA: Find Coreopsis leavenworthii in the Flora of North America (if available)
Google: Search Google for Coreopsis leavenworthii
MetadataRecord Modified: 2022-12-09
Research By: TWC Staff