Adam, there are several wild tulips which are stoloniferous. Familiar examples are Tulipa sylvestris, T. saxatilis (and evidently the related T. cretica), T. whittallii and many (all?) of the forms of T. clusiana in the modern sense. Tulipa praecox, widespread and probably introduced in southern Europe, is also said to be stoloniferous. This is a striking plant. Note that of those mentioned, all except T. sylvestris and some forms of T. clusiana have other than diploid chromosome counts and rarely if ever set viable seed. They are thought to be clones. You asked if the original Tulipa clusiana sets seed. Most of the old books say no, although I've heard at least one person claim that it spreads by seed in the garden. Perhaps it occasionally sets apomictic seed. I'm surprised that more people don't plant these stoloniferous tulips because if they survive at all they soon form thick colonies. However, in most cases there are more leaves than flowers. 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/