TREES
Trees in most cases have single trunks. See shrubs index.asp?pageid=732094for all multi stemmed plants that may look like trees, but which differ in this regard.
Use the sub tabs to see a number of local trees.
FORESTRY AND LAND SCOTLAND : This is a very useful guide to the main trees of Scotland. https://forestryandland.gov.scot/learn/trees
THE WOODLAND TRUST has this guide to trees with catkins : https://www.woodlandtrust.org.uk/blog/2018/12/which-trees-have-catkins-and-how-to-tell-them-apart/#:~:text=After%20pollination%20by%20insects%2C%20the%20female%20catkins%20lengthen,head.%20White%20down%20makes%20willow%20catkins%20appear%20fluffy.
and identifying those with seed pods : https://www.woodlandtrust.org.uk/blog/2017/11/tree-seed-identification-seven-common-uk-tree-seeds/
and the A to Z of British trees : https://www.woodlandtrust.org.uk/trees-woods-and-wildlife/british-trees/a-z-of-british-trees
The WOODLAND TRUST also has a free tree identification app. This can be downloaded via their website here:
https://www.woodlandtrust.org.uk/trees-woods-and-wildlife/british-trees/how-to-identify-trees/