Assertion: angiosperm's flower | /r/CapableOf | float in vallisneria spiralis
Facets:
value: upon reaching the surface
type: TEMPORAL
value: to the surface of the water
type: LOCATION
Source sentences:
text: In Vallisneria spiralis, an unopened male flower floats to the surface of the water, and, upon reaching the surface, opens up and the fertile anthers project forward.