I bought "Calochortus" by Gerritsen and Parsons. It is packed with botanical and historical information about Calochortus, and has wonderful detailed pictures of them. I checked the details of some of those I do know, and they seem right on target. The authors have done a wonderful job! Do read it if you love Calochortus or all of the Liliaceae. Marguerite English: Gardening with Penstemons, Salvias, Xeric plants, Dianthus, Narcissus, Roses, and Irises at 3500 feet in zone 7B, mountains of Southern California. I collect and grow tender plants and bulbs, especially Epiphyllum, Babiana, Lachenalia, Morea and Zephyranthes in a closed patio room.