A jar-shaped gall on the leaf of the Distylium racemosum tree is known as a 'hyon no mi' (literally, hyon nut) and the empty gall that remains when the insect has left is blown as a fue.
イスノキの葉にできた壺形の虫こぶを瓢の実といい、その中の虫が飛び出して中空になったものを笛として吹き鳴らすもの。