Acer ivanofense
... that the extinct maple Acer ivanofense is known from four Alaskan fossils?
... that the extinct <a href="./Maple" id="mwAlw" rel="mw:WikiLink" title="Maple">maple</a> <i id="mwAl0"><b id="mwAl4"><a href="./Acer_ivanofense" id="mwAl8" rel="mw:WikiLink" title="Acer ivanofense">Acer ivanofense</a></b></i> is known from four Alaskan fossils?