Dennstaedtia punctilobula (Michx.) T.Moore - Dennstaedtiaceae - hay-scented fern, Feingefiederter Schüsselfarn

„The common name „Hay-scented Fern“ comes from the fact that crushing it produces an aroma of fresh hay.“ https://en.wikipedia.org/wiki/Dennstaedtia_punctilobula

coumarin

„Forty-six ferns, representing 28 genera and 8 families, were examined for hydroxylated cinnamic acids and benzoic acids. In most plants examined the „basic complement“ of cinnamic acids, p-coumaric, caffeic, and ferulic, was present… Coumarin was shown to be present in Dennstaedtia punctilobula, the only fern tested which possessed this type of compound. “
[Bohm, Bruce A., and Rolla M. Tryon. „Phenolic compounds in ferns: I. A survey of some ferns for cinnamic acid and benzoic acid derivatives.“ Canadian Journal of Botany 45.5 (1967): 585-593]

Dennstaedtia punctilobula, Foto by Kathleen Moore CC-BY-SA 2.0 Norrth Carolina Extension Gardener Plant Toolbox