Look to Texas to see evolution’s true colors. There, speckling the state’s green fields, you’ll find the annual phlox, a flower also known as “Texas pride.” Its petals, a light purple elsewhere, are bright scarlet in the southeast near Austin. This color change isn’t a whim: It’s the annual phlox’s response to the presence of a close cousin, the pointed phlox. Native to East Texas, the pointed phlox also has purplish flowers.
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