Assertion: poison ivy's urushiol | /r/HasProperty | oleoresin
Facets:
value: after injury to the plant
type: TEMPORAL
value: late in the fall
type: TEMPORAL
Source sentences:
text: Urushiol is an oleoresin contained within the sap of poison ivy and related plants, and after injury to the plant, or late in the fall, the sap leaks to the surface of the plant, where under certain temperature and humidity conditions the urushiol becomes a blackish lacquer after being in contact with oxygen.
text: Urushiol is an oleoresin found in plant sap that protects the plant from injury.