mountain birch

Từ điển WordNet v3.1 - WordNet Dictionary

noun

birch of western United States resembling the paper birch but having brownish bark
• Syn:
swamp birch, water birch, Western paper birch, Western birch, Betula fontinalis
• Hypernyms:
birch, birch tree
• Member Holonyms:
Betula, genus Betula