This section is from the book "Harper's Guide To Wild Flowers", by Caroline A. Creevey. Also available from Amazon: Harper's Guide To Wild Flowers.
Parts of the flower in fours. Leaves, smooth, ovate, petioled, finely serrate. Small branches, rigid, like spines. May and June.
A thorny bush often cultivated for hedges. Grows from 6 to 20 feet high.
 
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