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5. Upright Prairie Coneflower; Ratibida columnifera (yellow)
Photo by Clarence A. Rechenthin @ USDA-NRCS Plants Database
Yellow flowers, especially yellow members of the Sunflower family are a favorite of Color Oklahoma for 2 major reasons; their seeds are usually plentiful and easy to obtain each year and their bright color makes them easy for drivers to see along our highways. This plant can grow to be 2.5 feet tall.