Suchchanges in flowering behavior, both among and within species, have implications for gene flow and pollination. If current warming and flowering trends continue, the overlap in cherry flowering dates that occur in relatively cool years will decline as the flowering dates of early-flowering species and individuals diverge from those of late-flowering ones. It is important that we determine whether this pattern is present in other genera in which several species flower in sequence. If it is, patterns of hybridization and resources for pollinators that depend on sequentially-flowering species
(e.g., Waser and Real, 1979) could change.