= 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: Tiliaceae
    Tilia americana - American basswood     Landowner Factsheet
    Tilia cordata - littleleaf linden
    Tilia petiolaris - silver linden