Flora of the British Isles, 3rd Edn.
By A. R. Clapham, T. G. Tutin and D. M. Moore. Cambridge University Press: 1987. Pp. 688. £65,$125.
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Stace, C. Hardy perennial. Nature 328, 772 (1987). https://doi.org/10.1038/328772a0
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DOI: https://doi.org/10.1038/328772a0