Dear Tom, One such book is "Hippeastrum the gardener's amaryllis" by Veronica M. Read, published by the Royal Horticultural Society Plant Collector Guide. ISBN 0-88192-639-6. The book does deal with species, but there is a heavy emphasis on hybrids. Best, Joyce Miller, Gresham, Oregon, USA Is there any book , field guide, about Hippeastrum species? Ton Wijnen The Netherlands _______________________________________________