sweet woodruff

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A fragrant perennial herb (Galium odoratum) native to Eurasia and widely cultivated as a ground cover, having small white flowers and narrow leaves used for flavoring wine and in sachets.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An aromatic perennial plant, used as a strewing herb, Galium odoratum or Asperula odorata, with small white flowers.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun fragrant dark green leaves used to flavor May wine
• noun Old World fragrant stoloniferous perennial having small white flowers and narrow leaves used as flavoring and in sachets; widely cultivated as a ground cover; in some classifications placed in genus Asperula