Assertion: clematis's flower | /r/HasAspect | a cluster of green carpels
Facets:
value: at its center
type: LOCATION
Source sentences:
text: Each pistillate flower has a cluster of green carpels at its center; each carpel has a short curled style.
text: Each perfect flower has a cluster of green carpels at its center, which are surrounded by one or two rows of stamens.