Most species of Amaryllis, Clivia, and Hippeastrum have a chromosome number of 2n = 22, suggesting that a hybrid between any two of these genera is theoretically possible. I suppose that is part of the ongoing allure to attempt these intergeneric crosses. Of course, there are many potential obstacles to creating such a hybrid and success seems extremely unlikely without embryo rescue. There is frequent mention of a Clivia x Hippeastrum hybrid created by the late Gordon McNeil in South Africa called 'Green Girl' but there is no evidence that I can find substantiating the claim that it is a true intergeneric cross. The picture of 'Green Girl' looks like just another nice Clivia selection: http://cliviaregister.com/clivia-register.php/… 'Green Girl' appears to be the only purported intergeneric hybrid described on the Clivia Register list. Nathan