Jamie, Close, but probably no cigar! I think the word is "introgression" -- the introduction of a gene from one species into another through hybridization and backcrossing (more or less). Between the lot of us, we seem to eventually get there...... I could not find the "-gression" part on my own. When you provided it, it only took me two or three hours to come up with the "intro-" part. As for Jim McK.'s hummingbirds, there is probably nothing we can do about them. Maybe put up lots of hummingbird feeders around the hybrid populations, to limit their further reproduction? This all started with a perfectly legitimate and innocent question from Marguerite, about what the real name for some "Naked Ladies" that grow in her town might be. Regards, Jim Shields At 09:53 PM 12/21/2007 +0100, you wrote: >Just a thought, but I think the term you are looking for is >'intergression'. ************************************************* Jim Shields USDA Zone 5 Shields Gardens, Ltd. P.O. Box 92 WWW: http://www.shieldsgardens.com/ Westfield, Indiana 46074, USA Tel. ++1-317-867-3344 or toll-free 1-866-449-3344 in USA