They say that the daughters of Helios were transformed from humans into black poplars. That wasn’t what happened. Rather, because of what happened to their brother, they threw themselves into the river Eridanos. When people searched beside the river and did not find them, but did find the trunks of three black poplars, they assumed that the daughters had been turned into trees. [Their names were Phoibe, Lampeto and Aigle.]