Assertion: cattail's seed | /r/HasProperty | flattened
Facets:
Source sentences:
text: Seeds are light-brown, flattened, 2.5-3 mm in diameter and with a finely granular surface.
text: Each flower is replaced by an ovoid seed capsule containing several seeds that are flattened and broadly winged; these seeds can be blown about by the wind and probably float on water.