I found this rather normal 4 leaf clover, about the 11th one i've found this year.
I went upstairs to press it in a book along with the others, I turned the clover around and underneath there was another leaf!
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"The 5-leaf clover is a mutation like the 4-leaf clover that does appear occasionally, but less common than the 4-leaf clover. There are 6, 7 and other multiple leaf clovers that sometimes occur.
The superstition for the 5-leaf clover is extra good luck and attracting money".
http://www.fourleafclover.com/vshop/facts_about_5-leaf_clovers.html