Assertion: fern | /r/HasProperty | useful
Facets:
value: in the shade garden
type: LOCATION
value: for ailments of the spleen
type: PURPOSE
value: from the soil
type: TRANSITIVE-OBJECT
value: in the removal of heavy metals
type: TRANSITIVE-OBJECT
Source sentences:
text: Ferns have been studied and found to be useful in the removal of heavy metals, especially arsenic, from the soil.
text: Ferns are also useful garden plants, especially in the shade garden or the woodland garden.
text: Although many modern pharmaceuticals are derived from chemicals produced by plants, there is little scientific evidence that ferns are useful as treatments for these or other ailments.
text: Both the scientific name and the common name "spleenwort" are derived from an old belief, based on the doctrine of signatures, that the fern was useful for ailments of the spleen, due to the spleen-shaped sori on the backs of the fronds.