[290] sorore flammati Phaethontis: i.e. the poplar. On the transformation of the Heliades into poplar-trees see Ov. Met. 2.340ff.;
, etc.; Cul. 127ff.“ namque ferunt luctu Cycnum Phaethontis amati,
populeas inter frondes umbramque sororum
dum canit
”