abies fraseri alabama appalachian-blue ridge forests appalachian mixed mesophytic forests arkansas armen takhtajan asa gray asia atlantic coastal pine barrens blue ridge mountains boreal kingdom canada castanea pumila china chrysogonum virginianum circumboreal region diamorpha diphylleia cymosa east coast of the united states eastern asiatic region echinacea paradoxa endemism eustoma russellianum fall line fernandezian region flora flora of arkansas flora of connecticut flora of north america florida franklinia galax genus gillenia great plains gulf coast of the united states hamamelis vernalis hamamelis virginiana hickory illinois iowa japan joseph gerhard zuccarini lachnanthes liriodendron liriodendron tulipifera madrean region magnolia acuminata magnolia fraseri magnolia grandiflora magnolia tripetala magnolia virginiana maple mediterranean basin minnesota monotypic neviusia north america north american prairies province northeastern coastal forests northern hemisphere nova scotia oak ontario paleotropical kingdom picea rubens pine pleistocene prairie quebec relict rocky mountain region rocky mountains saharo-arabian region sarracenia schwalbea shortia galacifolia southeast asia species stewartia taxodium ascendens taxodium distichum temperate broadleaf and mixed forests tertiary texas tsuga united states uvularia warea