Lewis & Short

hĕdĕra (ĕdĕra), ae, f., ivy, Hedera helix, Linn.; sacred to Bacchus, and hence wound around the thyrsus; also made into garlands with which poets were crowned, Plin. 16, 34, 62, § 144; Ov. F. 3, 767; id. M. 5, 338; Varr. ap. Serv. Verg. E. 7, 25; Verg. ib. 7, 38; 8, 13; id. G. 2, 258; Hor. C. 1, 1, 29; 1, 25, 17; id. Ep. 1, 3, 25; Juv. 7, 29 al.
In plur., Verg. E. 4, 19; id. G. 4, 124 al.