Alien plants of the British Isles: a provisional catalogue of vascular plants (excluding grasses)
Clement, E.J.; Foster, M.C.; Kent, D.H. (1994). Alien plants of the British Isles: a provisional catalogue of vascular plants (excluding grasses). Botanical Society of the British Isles: London. ISBN 0-901158-23-2. xviii, 590 pp.
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