Morphological and phenological matching shape functional heteranthery.
Oku M, Ida TY
Pollinators
If you grow crape myrtles and wonder why big bumblebee-sized carpenter bees seem to 'fit' the flower better than honeybees, this research explains exactly why — the plant evolved two different stamens and timed pollen release to match its best pollinator's morning schedule.
Crape myrtle flowers have two kinds of pollen-producing parts: some are 'food' pollen that bees eat, and others carry the 'real' pollen that fertilizes other flowers. Larger carpenter bees, whose bodies match the flower's shape, pick up the fertilizing pollen on their backs at just the right spot, while smaller honeybees mostly gather the food pollen on their undersides without helping the plant reproduce. The fertilizing pollen also opens up early in the morning — right when carpenter bees are most active — so the timing is no accident.
Key Findings
Feeding pollen had lower male fertility than pollinating pollen, confirming the two stamen types serve distinct roles in reproduction.
Large carpenter bees matched floral morphology and deposited pollinating pollen dorsally (on their backs), achieving higher pollen transfer efficiency than honeybees, which accumulated feeding pollen ventrally.
Pollinating anthers began dehiscing early morning, coinciding with peak carpenter bee activity, while feeding anthers opened later — a temporal division that governs pollinator encounter frequency.
chevron_right Technical Summary
Crape myrtle flowers have two types of stamens: one set that feeds bees and another that actually pollinates. This study shows that both the shape of the flower and the timing of pollen release work together to match specific bee species — large carpenter bees get the pollinating pollen at the right time and in the right place, while smaller honeybees mostly just collect the food pollen.
Abstract Preview
Heteranthery refers to the presence of morphologically distinct stamens within a flower. Previous studies have focused on morphological matching between floral structures and pollinator body size a...
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Lagerstroemia, commonly known as crape myrtle, is a genus of deciduous and evergreen trees and shrubs native to the Indian subcontinent, southeast Asia, northern Australia, and other parts of Oceania, cultivated in warmer climates around the world. It is a member of the family Lythraceae, which i...