Query: trees of of the southern and north central united states, but not trees of eastern canada
Domain: plants
Relevant documents:
Aesculus pavia
Oxydendrum
Taxodium distichum
Pecan
Quercus havardii
Fraxinus americana
Maclura pomifera
Ilex decidua
Cladrastis kentukea
Celtis laevigata
Zanthoxylum americanum
Diospyros virginiana
Sapindus saponaria
Leitneria
Pinus echinata
Salix nigra
Celtis tenuifolia
Halesia tetraptera
Sideroxylon lycioides
Sideroxylon lanuginosum