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  • Work
    Article
    Castellanos, Maria Clara
    Floral phenotypes may be as much the result of selection for avoidance of some animal visitors as selection for improving the interaction with better pollinators. When specializing on hummingbird‐pollination, Penstemon flowers may have evolved to impr . . .
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    Article
    Wilson, Paul S.
    Male-male competition in plants is thought to exert selection on flower morphology and on the temporal presentation of pollen. Theory suggests that a plant’s pollen dosing strategy should evolve to match the abundance and pollen transfer efficiency of . . .
  • Wh246w224?file=thumbnail
    Article
    Thomson, James D.
    Male-male competition in plants is thought to exert selection on flower morphology and on the temporal presentation of pollen. Theory suggests that a plant's pollen dosing strategy should evolve to match the abundance and pollen transfer efficiency of . . .
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    Article
    Thomson, James D.
    Plants that experience variation in pollinator visitation rates or fluctuations in weather conditions may be expected to have evolved homeostatic mechanisms that regulate their nectar offerings, thereby providing a more constant reward to the pollinat . . .
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    Book chapter
    Castellanos, Maria Clara
    This is a story about change and lack of change. The subjects are penstemons. The flowers of certain closely related penstemons differ dramatically, whereas certain distantly related species are eerily similar. This is due to the repeated evolution of . . .
  • Work
    Article
    Wilson, Paul S.
    Plants that experience variation in pollinator visitation rates or fluctuations in weather conditions may be expected to have evolved homeostatic mechanisms that regulate their nectar offerings, thereby providing a more constant reward to the pollinat . . .
  • Work
    Article
    Wilson, Paul S.
    We compared pollen removal and deposition by hummingbirds and bumblebees visiting bird-syndrome Penstemon barbatus and bee-syndrome P. strictus flowers. One model for evolutionary shifts from bee pollination to bird pollination has assumed that, mostl . . .
  • Work
    Article
    Thomson, James D.
    The seeming ubiquity of spatio?temporal variation in pollination regime suggests that flowers ought to be adapted to a wide range of pollinators, yet many comparative biologists perceive that in groups with complex flowers there is considerable specia . . .