In 1860, Charles Darwin had an epiphany. This was not an epiphany on the origin of species, as his monumental publication on the subject had been published one year earlier in 1859. This epiphany, which Darwin shared in a letter to his friend Joseph Dalton Hooker, was that flowers in the genus Primula display two distinct forms which differ in the length of the pistil’s styles and the height of the stamen’s anthers.
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