Regensburg Botanical Society
... that the Regensburg Botanical Society, founded on 14 May 1790, is the world's oldest extant botanical society?
... that the <b id="mwAaU"><a href="./Regensburg_Botanical_Society" id="mwAaY" rel="mw:WikiLink" title="Regensburg Botanical Society">Regensburg Botanical Society</a></b>, founded on 14 May 1790, is the world's oldest extant botanical society?