Illustrations of the Alien Plants of the British Isles. E. J. Clement, D. P. J. Smith & I. R. Thirlwell. London: BSBI. 2005. viii + 466pp., many figs. ISBN 0 901158 32 1. £18.75 (paperback). - MCHAFFIE, H. (Edinburgh Journal of Botany, 2006)