Includes bibliographical references (pages 212-219) and index.

"This book starts with an introduction to the genus followed by detailed descriptions of the four species and their hybrids. These will be of value to gardeners as they weigh up distinguishing features and assess which plants will perform best for them. The book also notes how local conditions, soil and weather extremes can significantly affect plant characteristics including rate of growth, size of plant, leaf retention and flower colour. Cultural requirements and hardiness tolerance are clearly outlined, further ensuring success in the garden."--BOOK JACKET