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Walnut trees belong to the plant genus Juglans, the type genus of the family Juglandaceae. Their seeds are what we commonly call, walnuts. Walnut trees, which are deciduous, reach heights of 40 metres. The larvae of some Lepidoptera species like to feed on walnut trees. These include the Emperor moth (Pavonia pavonia), the Engrailed (Ectropis crepuscularia), Walnut sphinx (Amorpha juglandis), Brown-tail (Euproctis chrysorrhoea), Coleophora case-bearers (C. laticornella and C. pruniella), Common Emerald (Hemithea aestivaria), and the Bride (Catocala neogama).