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This paper provides a key to the identification of rosettes of 113 species of 56 genera of dicotyledonous flowering plants in eastern Nebraska. The key is based on observations of fresh and dried specimens collected from 1977 to 1990. Rosettes were identified from personal experience, by growing seeds or transplanted rosettes in a greenhouse, or by comparison and association with mature plants found growing with the rosettes. Key characteristics taken from dried specimens included leaf shape, leaf size, marginal configuration, surface vestiture, venation pattern, and subterranean morphology while characteristics observed in the field included distribution, habitat, odor, and presence or absence of latex.