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<references>
<ref name="chemical composition">[https://www.henriettes-herb.com/eclectic/kings/viburnum-opul.html "chemical Chemical constituents "]</ref>
<ref name="Leaf">[https://www.woodlandtrust.org.uk/visiting-woods/trees-woods-and-wildlife/british-trees/native-trees/guelder-rose/ "plant Plant description"]</ref>
<ref name="How to plant/cultivate">[https://www.pfaf.org/user/Plant.aspx?LatinName=viburnum+opulus "Cultivation details"]</ref>
</references>