Вот что партнеры западные пишут
Sen is often confused with another Japanese export, Japanese ash, also known as tamo. In some areas, Japanese ash and sen are used as trade names for the same species; however, Japanese ash (tamo) is from the species Fraxinus mandschurica of the Family Oleaceae, while sen is from the species Acanthopanax ricinifolius of the Family Araliaceae.