belonging to the Betulaceae, the birch family of plants.
Compare birch family.
Origin of betulaceous
< Latin betul(a) birch + -aceous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
of, relating to, or belonging to the Betulaceae, a family of mostly N temperate catkin-bearing trees and shrubs such as birch and alder, some species of which reach the northern limits of tree growth
Word Origin for betulaceous
C19: from Latin betula birch
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012