Assertion: milkweed's leaf | /r/HasProperty | sole food
Facets:
value: for monarch butterfly caterpillars
type: TRANSITIVE-OBJECT
Source sentences:
text: Milkweed is the only plant that monarch butterflies lay eggs on, and its leaves are the sole food eaten by this butterfly
text: Milkweed (Asclepias spp.) is valued primarily because its nectar attracts butterflies and because its leaves are the sole food source for monarch butterfly caterpillars.