Information for plant descriptions, biographies and many other facts, have been obtained from many printed sources, as well as from personal observation. The main sources are listed below.
Many of these books are still available through libraries, if not for purchase, and are well worth consulting for much scientific and background information which had to be excluded from these web pages.
We acknowledge our indebtedness to the tireless efforts of the many authors and publishers who have made researching these pages much more of a pleasure than a chore.
L. H. Bailey Hortorium, Hortus Third. Macmillan Publishing Company, New York, 1976.
Bean, W. J., Trees and Shrubs Hardy in the British Isles, 8th edition, 4 vols. plus Supplement. John Murray, London, 1970.
Elwes, H. J. & Henry, A. H., The Trees of Great Britain and Ireland, 7 vols. Repub. by S. R. Publishers Ltd, Wakefield, Yorkshire, 1969.
European Garden Flora, 6 vols. Cambridge University Press, 1986 onwards.
Hillier's Manual of Trees and Shrubs, 5th edition. Van Nostrand Reinhold Company, New York, 1983.
Howes, F. N., A Dictionary of Useful and Everyday Plants and their Common Names. Cambridge University Press, 1974.
Krussmann, G., Manual of Cultivated Broad-Leaved Trees and Shrubs, 2nd edition, 3 vols. Timber Press, Oregon, USA, 1984.
Nelson, E C., A Heritage of Beauty. The Irish Garden Plant Society, Dublin, 2000.
New York Botanical Garden Illustrated Encyclopedia of Horticulture, 10 vols. Garland Publishing, New York, 1980.
Phillips, R., Trees in Britain, Europe and North America. Pan Books, London, 1978.
Phillips, R. and Rix, M., Perennials, 2 vols. Pan Garden Plants Series, Pan Books Ltd, London, 1991.
Reader's Digest Encyclopaedia of Garden Plants and Flowers, 1st edition. Reader's Digest Association, London, 1971.
Royal Horticultural Society Gardener's Encyclopaedia of Plants and Flowers, 2nd edition. Dorling Kindersley, London, 1994.
Salmon, J. T., The Native Trees of New Zealand. Reed Books, New Zealand, 1980.
Stearn, W. T., Botanical Latin. Thos. Nelson and Sons Ltd, London, 1966
Willis, J. C., A Dictionary of the Flowering Plants and Ferns, 8th edition, Cambridge University Press, 1973.