Butterflies pick flower color and shape over nectar volume
Rameesa P, Anand PP, Shibu Vardhanan Y.
Pollinators
If you grow Ixora shrubs for butterflies, this shows that swapping to the species with tubular flowers that blush from orange to red will draw far more visitors than one that simply offers more nectar.
Scientists compared two closely related flowering shrubs growing side by side and found butterflies visited one far more often, even though the other plant made more nectar. The winning flower had a shorter tube that better fit butterfly tongues, plus a color-changing trick, turning from orange to red as it aged, that seemed to advertise better-quality nectar underneath. It turns out pollinators are reading a combination of shape, color, and chemistry, not just counting nectar drops.
Key Findings
Butterflies made 69% of all pollinator visits, with proboscis length correlating strongly (r = 0.988) with corolla tube length
Ixora coccinea has longer corolla tubes (40.7mm) than Ixora chinensis (35.0mm), restricting access to fewer pollinators
Ixora chinensis flowers shift color from orange to red with age and signal higher-quality nectar, yet pollinators still preferred it over the higher-nectar-volume Ixora coccinea
chevron_right Technical Summary
Butterflies overwhelmingly prefer one species of West Indian jasmine over its close relative, not because it offers more nectar, but because it combines a shorter flower tube, a color that shifts from orange to red as it ages, and richer nectar quality.
Abstract Preview
Original paper
Pollinators preferences in sympatric Ixora chinensis and Ixora coccinea; an integrative analysis of geometric morphometrics, floral colour dynamics, and nectar chemistry.
Floral characteristics such as shape, symmetry, coloration, and nectar rewards collectively influence pollinator preferences and drive plant-pollinator coevolution. In this study, we examined polli...
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Ixora chinensis, commonly known as Chinese ixora, is a species of plant of the genus Ixora. It is a shrub native to southeastern China, Indochina, and the Philippines.