English Botany, or Coloured Figures of British Plants, deel 4, J.E. Sowerby (1865)
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Iconographie du Genre Epilobium, Epilobes d'Amérique, Epilobes d'Europe, Augustin Abel Hector Léveillé (1911)
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Flora of the U.S.S.R. /Botanicheskii institut Akademii nauk SSSR, deel 15, V.L. Komarov
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