We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitlePollinator shifts drive increasingly long nectar spurs in columbine flowers.AuthorsWhittall JB; Hodges SAPublicationNature, 2007, Vol 447, Issue 7145, p706ISSN1476-4687Publication typearticleDOI10.1038/nature05857