Guelder rose berry

Name variations

 * water elderberry
 * European cranberry
 * cramp bark berry
 * snowball tree berry

About Guelder rose berries
The fruit is edible in small quantities, with a very acidic taste; it can be used to make jelly. It is however very mildly toxic, and may cause vomiting or diarrhea if eaten in large amounts (Plants for a Future). This can be reduced by drying the bark first.