WordNet sense 1 (fern of eastern North America with pale green fronds and an aroma like hay):

hay-scented, Dennstaedtia punctilobula, boulder fern, hay-scented fern

WordNet sense 2 (sweetly scented African fern with narrow bipinnate fronds):

Mohria caffrorum

WordNet sense 3 (common perennial aromatic herb native to Eurasia having buttonlike yellow flower heads and bitter-tasting pinnate leaves sometimes used medicinally):

tansy, golden buttons, Tanacetum vulgare