Definitions

1. noun

the genus of trees commonly known as birch, including paper birch (B. papyrifera), paperbark maple (B. papyrifera), and river birch (B. nana).

“The forest was dominated by a variety of betula species.”

2. genus

a genus of birch trees, including the paper birch (B. papyrifera), paperbark maple (B. papyrifera), and river birch (B. nana).

“Betula is a genus of deciduous trees native to the Northern Hemisphere.”