Betula pubescens and Birch tree

Betula pubescens noun - European birch with dull white to pale brown bark and somewhat drooping hairy branches.

Birch tree and Betula pubescens are semantically related. In some cases you can use "Birch tree" instead a noun phrase "Betula pubescens".

Birch tree noun - Any betulaceous tree or shrub of the genus Betula having a thin peeling bark.

Betula pubescens and birch tree are semantically related. Sometimes you can replace phrase "Betula pubescens" with "Birch tree", this phrases are similar.