bifrons from L. bi(s), twice; frons, leaf, foliage: with 2 kinds of leaves, with dimorphic leaves, or with 2 faces, with 2 different sides (e.g. leaves)
 
822612 691633 Narcissus tazetta L. [80 691015 Narcissus bifrons Ker Gawl.] W. Curtis, Bot. Mag., vol. 29 : t. 1186 (1809) [n.a.]
 
832812 691633 Narcissus tazetta L. [80 691015 Narcissus bifrons Ker Gawl.] W. Curtis, Bot. Mag., vol. 32 : t. 1299 (1810) [S.T. Edwards]