belonging to the Ericaceae, the heath family of plants.
Compare heath family.

1880–85; < Neo-Latin Ericace(ae) (see erica, -aceae) + -ous Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ericaceous (ˌɛrɪˈkeɪʃəs)
of, relating to, or belonging to the Ericaceae, a family of trees and shrubs with typically bell-shaped flowers: includes heather, rhododendron, azalea, and arbutus
[C19: from New Latin Erīcāceae, from Latin erīca heath, from Greek ereikē]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The density of ericaceous species may be closely tied to land-use and disturbance history.
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