Query: Trees of Western Canada also of Alaska
Domain: plants
Relevant documents:
Populus balsamifera
Populus trichocarpa
Abies lasiocarpa
Betula neoalaskana
Taxus brevifolia
Thuja plicata
Tsuga mertensiana
Tsuga heterophylla
Picea mariana
Callitropsis nootkatensis
Picea glauca
Picea sitchensis