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Roses are red. Violets are blue. What gives flowers those eye-catching hues?
Knock-your-eyes-out red: A flowering plant native to Mexico called early jessamine or red cestrum.
Credit: Julienne Ng
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Scientist Stacey Smith collecting plant samples near Tambo de Viso in central Peru.
Credit: Segundo Leiva
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The flowers of Brugmansia sanguinea are a vibrant blood-red, hence the plant's name.
Credit: Julia Dupin
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Microscope view of a red Calibrachoa flower's petal. The plant is also known as million bells.
Credit: Stacey Smith
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The flowers of the Jaltomata plant are awash in red nectar at the bases of their flowers.
Credit: Segundo Leiva
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Researchers found extensive color variation in this single flower species in Bolivia.
Credit: Stacey Smith
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