Jan, Colchicum 'Waterlily' itself is said to have resulted from a cross between Colchicum speciosum 'Album' with a double, white-flowered form of C. autumnale in a effort to get a large double-flowered white colchicum. 'Alboplenum' is not a sport of 'Waterlily'; if anything, it might be the double white autumnale form used to produce 'Waterlily'. However, as you noticed, it has only a few anthers. Bowles recorded another less double white-flowered form of autumnale; and if that form has more anthers, then perhaps it was used to produce 'Waterlily'. It might be worthwhile to re-do these crosses using the white-flowered Colchicum 'Innocence' aka 'byzantinum album' instead of Colchicum speciosum 'Album'. Jim McKenney jimmckenney@jimmckenney.com Montgomery County, Maryland, USA, 39.03871º North, 77.09829º West, USDA zone 7 My Virtual Maryland Garden http://www.jimmckenney.com/ BLOG! http://mcwort.blogspot.com/ Webmaster Potomac Valley Chapter, NARGS Editor PVC Bulletin http://www.pvcnargs.org/ Webmaster Potomac Lily Society http://www.potomaclilysociety.org/