meadow knapweed
... that meadow knapweed is a hybrid between black knapweed and brown knapweed, which were both introduced to North America?
... that <b id="mwBak"><a href="./Meadow_knapweed" id="mwBao" rel="mw:WikiLink" title="Meadow knapweed">meadow knapweed</a></b> <i id="mwBas">(example pictured)</i> is a <a href="./Hybrid_(biology)" id="mwBaw" rel="mw:WikiLink" title="Hybrid (biology)">hybrid</a> between <a href="./Centaurea_nigra" id="mwBa0" rel="mw:WikiLink" title="Centaurea nigra">black knapweed</a> and <a href="./Centaurea_jacea" id="mwBa4" rel="mw:WikiLink" title="Centaurea jacea">brown knapweed</a>, which were both introduced to North America?