Assertion: water chestnut's leaf | /r/HasProperty | found along submerged stem
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Source sentences:
text: According to the National Parks Service this aquatic invasive species has a rosette of floating leaves at the water’s surface; saw-tooth margins; triangular in shape and connect to an inflated petiole which provides added buoyancy for the leafy portion; additional, feather-like leaves can be found along the submerged stem.