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Cyto taxonomic and chemo taxonomic studies on the sections officinalia and coerulea of the genus symphytum



Cyto taxonomic and chemo taxonomic studies on the sections officinalia and coerulea of the genus symphytum



Botanica Helvetica 93(2): 169-192



Cytological and phytochemical studies of the S. officinale polyploid complex, S. asperum and S. peregrinum clearly indicated that S. peregrinum is a distinct taxon. S. peregrinum differs cytologically, morphologically, chemically and in its distribution from S. officinale and S. asperum. Therefore it cannot be regarded as a hybrid between these species. S. .times. uplandicum (2n = 36, 40) differs from S. peregrinum (2n = 40) morphologically, chemically and in part cytologically. The 2n = 40 cytotype of S. officinale differs both from the diploid (2n = 24) and tetraploid (2n = 48) cytotype in morphological aspect, but not in chemical respect. It contains the same pyrrolizidine alkaloids as S. officinale (2n = 24, 48). For that reason and also because this cytotype is interfertile with the 2n = 48 cytotype, it is regarded as conspecific with S. officinale (2n = 48). The lack of information of the exact identity of the Western 2n = 40 cytotype of S. officinale and the Eastern morphotype of S. tanaicense Stev. presently does not permit a taxonomic recognition and an assignment of the appropriate rank to these taxa.

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