What is "cleidion"

Cleidion is a plant genus of the family Euphorbiaceae, first described in 1826. It is found in tropical and subtropical regions in Asia, Africa, Australia, Latin America, and various islands of the Pacific and Indian Oceans.

moved to other genera ( Acalypha Acidoton Adenophaedra Alchornea Bocquillonia Cleidiocarpon Conceveiba Macaranga Orfilea Plukenetia Trigonostemon) ''