Species of "Cyanea" on each major island tend to differ in flower tube length and mean elevation, apparently reflecting a partitioning of ecological and reproductive resources. The total number of species of "Cyanea" can be predicted rather precisely from the height and area of each of the major islands except Hawaii (the Big Island), suggesting that the assembly of "Cyanea" communities requires more than 0.6 million years (the age of Hawaii) and less than 1.5 million years (the age of Maui) to run to ecological saturation (Givnish et al. 2008).