| floral color change in weigela middendorffiana (caprifoliaceae): reduction of geitonogamous pollination by bumble bees. | we examined the significance of retaining color-changed flowers in pollination success of weigela middendorffiana through a single visit of bumble bees. inner parts of flowers changed color with age from yellow to red. in an investigation of the mating system, duration of each color phase, reproductive ability of each of the color-phase flowers, and the effects of color-changed flowers on bumble bee behavior (1) flowers of this species were self-incompatible, (2) color-changed flowers provided l ... | 2003 | 21653352 |