Willow

There are 400 species of willow, Salix, ranging from trees to sub shrubs, and hybrids are common. There could be many more as they are difficult to identify.  You would require a good tree ID book in order to identify them.
 
The leaves are frequently elongated but some species have round or oval leaves.

 Goat willow leaves

 

Goat willow catkins March

Catkins, later in March

Male goat willow catkins April

 

Female goat willow catkins April

Seeded catkins June

Further reading

 Willows  The Genus Salix - Christopher Newsholme.

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