Perennial below-ground stem tuber. Its senescence may result in plant fragmentation. No daughter tubers are produced. The mother tuber grows monopodially and thickens due to secondary growth. Decaying of the tuber starts from its centre. The perennial stem tuber serves as storage organ and as a bud bank. Vegetative spreading is poor

[other examples: Allium angulosum, Cyclamen purpurascens, Eranthis hyemalis].

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