Caucasian Wingnut Pterocarya fraxinifolia
The Caucasian Wingnut is a deciduous tree native to the Caucasus region of Armenia, Azerbaijan, Georgia, Iran, Russia, the Ukraine and Turkey. It was introduced to Britain in1782. It is now found in many parks and large gardens. It has long female catkins that hang down through summer and autumn.
The tree is monoecious, meaning that it has male and female flowers on the same tree. Female catkin on the left and male catkin on the right at the end of April. Male flowers appear in March/April and are shed by mid May after releasing pollen. Female catkins bear fruit
Close-up of a female catkin with flowers showing red stigmas, ready to receive pollen at the end of April
Close-up of the female catkin in September. Each flower has produced a single winged fruit – the ‘wing nut’