Alani, Thanks for the reference. I immediately sought and bought the book Amazon 27.95 new...free shipping). I usually don't buy books without a significant discount, but such a reference would be invaluable. Carlo Carlo A. Balistrieri The Gardens at Turtle Point Tuxedo Park, NY 10987 Zone 6 (845.351.2049) Visit: http://www.botanicalgardening.com/