Same plant with different number of petals

Today I found this plant with variable number of petals on the same plant, so I was wondering is this very rare or is it something that is common in some plants?

Link of original observation:
https://www.inaturalist.org/observations/61594673

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It happens. I see this in annual Polemoniaceae more than any other group

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Galium is also notorious for this.

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You see it in Rubiaceae as well.

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One time this year, I found a forget-me-not with 10 petals. I wish I had gotten a picture.

“Plants vary” - Dr Lewis Anderson, bryologist 1912-2007

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