KNOTT, D. Handbook of North European Garden Plants With Keys to Families and Genera. Edited by James Cullen. Cambridge: Cambridge University Press. 2001. 640pp. ISBN 0 521 65183 2, £75.00 (hardback). ISBN 0 521 00411 X, £29.95 (paperback). Edinburgh J. Bot. 2002, 59 (3), 459-466. https://doi.org/10.1017/S0960428602240299.