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Native Plant
Umbilicaria arctica
Native Plant
Umbilicaria aprina
Native Plant
Umbilicaria americana
Native Plant
Umbilicaria angulata
Non-native Plant
Ulmus villosa
Non-native Plant
Ullucus tuberosus
Native Plant
Ulmus thomasii
Native Plant
Ulmus serotina
Non-native Plant
Ulmus pumila × rubra
Native Plant
Ulota reptans
Non-native Plant
Ulmus pumila
Non-native Plant
Ulmus procera
Non-native Plant
Ulva pertusa
Native Plant
Ulota phyllantha
