Abingdon
... that the weeping willow planted by John Parke Custis on his Abingdon plantation is known as the progenitor of all weeping willows in the United States?
... that the <a href="./Salix_babylonica#Subdivisions" id="mwELo" rel="mw:WikiLink" title="Salix babylonica">weeping willow</a> planted by <a href="./John_Parke_Custis" id="mwELs" rel="mw:WikiLink" title="John Parke Custis">John Parke Custis</a> on his <b id="mwELw"><a href="./Abingdon_(plantation)" id="mwEL0" rel="mw:WikiLink" title="Abingdon (plantation)">Abingdon</a></b> <a href="./Plantation" id="mwEL4" rel="mw:WikiLink" title="Plantation">plantation</a> is known as the <a href="./Progenitor" id="mwEL8" rel="mw:WikiLink" title="Progenitor">progenitor</a> of all weeping willows in the <a href="./United_States" id="mwEMA" rel="mw:WikiLink" title="United States">United States</a>?