Cytotaxonomic studies in the genus Symphytum. VI. Some notes on Symphytum in Britain
Acta botanica neerlandica , Volume 23 - Issue 4 p. 433- 437
122 British plants of the genus Symphytum were investigated cytologically. White-flowered diploid (2n=24) and white- and purple-flowered tetraploid (2n=48) plants of S. officinale occur in Britain. S. X uplandicum. the hybrid between S. officinale (2n = 40 or 2n = 48) and S. asperum (2n = 32) is variable, but two types can be distinguished, the first of which has 2n = 36, purple flower-buds and purple (or blue-purple) corollas, the second 2n =40, pink flower-buds and pink corollas, which turn blue when the flowers age. The way in which these hybrids arose is discussed.
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T.W.J. Gadella, E. Kliphuis, & F.H. Perring. (1974). Cytotaxonomic studies in the genus Symphytum. VI. Some notes on Symphytum in Britain. Acta botanica neerlandica, 23(4), 433–437.
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