GADELLA,TWJ: KLIPHUIS,E:. (1975). CYTOTAXONOMIC STUDIES IN THE GENUS SYMPHYTUM. VII. SOME HYBRIDS BETWEEN S.ASPERUM LEPECH. AND S.OFFICINALE L.IN DENMARK.. 78(2)
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CYTOTAXONOMIC STUDIES IN THE GENUS SYMPHYTUM. VII. SOME HYBRIDS BETWEEN S.ASPERUM LEPECH. AND S.OFFICINALE L.IN DENMARK.