been reviewed by A. J. Richards (1985) and by J. Kirschner and J. Štepánek (1987, 1997). The European species were treated by Richards and P. D. Sell (1973)
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among three species of Ratibida. Univ. Kansas Sci. Bull. 44: 3–27. Richards, E. L. 1968. A monograph of the genus Ratibida. Rhodora 70: 348–393. Ratibida
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(E. L. Richards 1968). Some authors have argued that Ratibida columnaris (Sims) D. Don is the correct name for this species; J. L. Reveal (1968) and E
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Variety picta has been reported to hybridize with var. peduncularis (E. L. Richards 1968) and Ratibida columnifera (S. W. Jackson 1963). None. None. window.p
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Illinois during the last 30,000 years. Palynology 13: 63--77. Ball, P. W. 1968. Vicia. In: T. G. Tutin et al., eds. 1964-- 1980. Flora Europaea. 5 vols
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