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1 July 2014 Competition and Niche Requirements of Coreopsis tinctoria: A Widespread but Local High Density Annual Asteraceae
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Abstract

Coreopsis tinctoria (coreopsis, calliopsis, plains coreopsis, or golden wave) is an annual herbaceous Asteraceae with a broad geographic distribution mostly in the central and western United States. It co-occurs with Bouteloua curtipendula (sideoats grama) or other native C4 grasses. When grown together, C. tinctoria response variables decreased significantly in the presence of B. curtipendula aboveground, belowground, and total dry mass. The response variables included mean plant height, number of flower buds per plant, flowers per plant, as well as aboveground, belowground, and total dry mass. The presence of B. curtipendula belowground dry mass caused the greatest suppression of C. tinctoria belowground dry mass. When B. curtipendula tops were clipped to reduce grass aboveground dry mass (simulated herbivory), the percent survival of C. tinctoria plants increased from one percent in the no-clipping treatment to 18% in the neighbor removal treatment (100% clipped). Coreopsis tinctoria does not appear to be a good competitor in the presence of B. curtipendula and seems to be restricted to gaps or patches in disturbed grasslands where competition from perennial grass neighbors is reduced.

California Botanical Society
S. A. Elliott and O. W. Van Auken "Competition and Niche Requirements of Coreopsis tinctoria: A Widespread but Local High Density Annual Asteraceae," Madroño 61(3), 290-298, (1 July 2014). https://doi.org/10.3120/0024-9637-61.3.290
Published: 1 July 2014
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