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Flora regni borussici, deel 2, A.G. Dietrich (1834)
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Genera plantarum florae germanicae, Dicotyledones Gamopetalae 2, deel 4, T.F.L. Nees von Esenbeck (1843)
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Flora Danica, Georg Christian Oeder e.a. (1761-1883)
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Illustrations of the British Flora, Walter Hood Fitch (1924)
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