Assertion: black walnut's leaf | /r/MadeOf | nontoxic chemical
Facets:
value: like other walnuts
type: OTHER
Source sentences:
text: Like other walnuts, the roots, inner bark, nut husks, and leaves contain a nontoxic chemical called hydrojuglone, when exposed to air or soil compounds it is oxidized into juglone that is biologically active and acts as a respiratory inhibitor to some plants.