scented fern

definition: common perennial aromatic herb native to Eurasia having buttonlike yellow flower heads and bitter-tasting pinnate leaves sometimes used medicinally
example:
speech part: noun
synonyms: tansy
definition: sweetly scented African fern with narrow bipinnate fronds
example:
speech part: noun
synonyms:
definition: fern of eastern North America with pale green fronds and an aroma like hay
example:
speech part: noun
synonyms: hay-scented hay-scented fern boulder fern

How scented fern is being used?