I find this discussion of Iris pseudacorus very interesting. When we were researching the literature for the invasive species risk analysis we discovered this species actually has a number of races (I am not sure this is the correct term) within in it with different chromosome numbers. Phenotypically, they all look identical to the human eye - and they are all mixed up in commerce. One of the hypothesis explaining why this 'species' has been so successful in naturalizing native habitats is this genetic variability. If one set of chromosome numbers doesn't provide the adaptive characteristics apparently sometimes a different set will. Like Jim Waddick in Kansas City, we have at last broken out of a cold damp period and are enjoying some warm weather. Some of Jim Shields Crinum crosses are in flower and a dark pink Hippeastrum hybrid. Both are planted against the south facing side of my home where the winter soil temperatures are moderated by the relatively warm basement wall. Boyce Tankersley Director of Living Plant Documentation Chicago Botanic Garden 1000 Lake Cook Road Glencoe, IL 60022 tel: 847-835-6841 fax: 847-835-1635 email: email@example.com I grow Iris 'Sea Krill' which I think is an I. pseudacorus cross. But I don't really know anything about its ancestry. Can any one fill me in?