Zanthoxylum americanum (Common Prickly Ash)
Also known as: Toothache Tree
Native: Eastern North America
Location: Grown in European gardens.
The north American Indians are said to have chewed the twigs and fruit to east the pain of toothache. Usually a shrub.
Leaves have 5-11 leaflets, with small rounded teeth and branches bear stout sharp prickles.
Flowers open in May or June.
Fruits are about 0.6cm long and ripen to black in October or November.