Assertion: jefferson elm | /r/HasProperty | possible hybrid
Facets:
value: between ulmus americana
type: LOCATION
value: between another species
type: OTHER
value: for many years
type: TEMPORAL
Source sentences:
text: The Jefferson elm had been considered for many years to be a possible hybrid between Ulmus americana and another species; however, DNA tests performed in 2004 by the U.S. National Arboretum indicate that it is of American elm parentage exclusively and is likely to be tetraploid, earlier reports notwithstanding.