= nonnative, planted and a wildland component, commonly "escapes" cultivation
= nonnative, planted, generally not considered a wildland component or invasive
= a North American native, may naturalize outside its native range
Family: Betulaceae
    Alnus cordata - Italian alder
    Alnus glutinosa - European black alder
    Alnus incana ssp. rugosa - speckled alder
    Alnus incana ssp. tenuifolia - thinleaf alder
    Alnus oblongifolia - Arizona alder
    Alnus rhombifolia - white alder
    Alnus rubra - red alder     Landowner Factsheet
    Alnus serrulata - hazel alder
    Alnus viridis ssp. sinuata - Sitka alder
    Betula alleghaniensis - yellow birch     Landowner Factsheet
    Betula lenta - sweet birch     Landowner Factsheet
    Betula nana - bog birch
    Betula nigra - river birch
    Betula occidentalis - water birch
    Betula papyrifera - paper birch     Landowner Factsheet
    Betula pendula - European weeping birch
    Betula populifolia - gray birch
    Betula uber - roundleaf birch
    Betula utilis - Himalayan white birch
    Carpinus betulus - Eurpean hornbeam
    Carpinus caroliniana - hornbeam
    Carpinus japonica - Japanese hornbeam
    Corylus americana - American hazel
    Corylus avellana - common filbert
    Corylus colurna - Turkish hazel
    Corylus cornuta - beaked hazel
    Ostrya virginiana - hophornbeam