Ptelea trifoliata (Hop Tree)
Also known as: Stinking Ash
Native: Southern Canada and eastern United States
Location: Planted in gardens and sometimes naturalised in central Europe.
Leaves have three leaflets, and like the bark and unripe fruits give off a strong aromatic smell when crushed.
Flowers may be almost white and open in June and July, each about 0.8cm in round clusters about 5-7.5cm across.
Fruits are up to 2.5cm across, eventually ripening to a pale straw colour.