Why Five Petals?

It’s interesting to me, as I try to identify plants I don’t recognize, how many flowers have 5 petals.  So many, in fact, that my flower guide seems to have more 5 petal pages for each color than any other.  This St. John’s wort ( Hypericum perforatum ) has just appeared.  I like the alternative name, rosin rose.

st-johns-wort-emerging-summer-yellow-five-petals-spread

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