gillyflower

1. The carnation or a similar plant of the genus Dianthus.
2. Any of several plants, such as the wallflower, that have fragrant flowers.

[Alteration (influenced by FLOWER) of Middle English gilofre, from Old French gilofre, girofle, clove, from Late Latin gariofilum, from Greek karuophullon : karuon, nut + phullon, leaf.]

The noun has 2 meanings:

Meaning #1: any of several Old World plants cultivated for their brightly colored flowers
  Synonym: stock

Meaning #2: Eurasian plant with pink to purple-red spice-scented usually double flowers; widely cultivated in many varieties and many colors
  Synonyms: carnation, clove pink, Dianthus caryophyllus