Which one is native to the Pacific Northwest?

Three of these might be found on your dinner table. The other is a native tree of the Pacific Northwest. Which are which?

What's a maple flower?

Do native maple trees bear flowers? If so, what do they look like? How can I recognize them?

Pussy willows are releasing pollen

What are pussy willows doing now? Stamens have emerged from the male catkins and are releasing pollen grains.