The text discusses the scientific mystery surrounding Beardtongue flowers, which are part of the Penstemon genus. These flowers, including the New Mexico Beardtongue, Upright Blue Beardtongue, and red Beardtongues, are considered a species complex due to their close genetic relationship, challenging the traditional definition of a species.
We Thought We Knew Everything About Speciation—Then These Three Showed Up
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