Assertion: aspen's leaf | /r/HasProperty | arranged
Facets:
value: spirally
type: DEGREE
Source sentences:
text: The leaves are spirally arranged, and vary in shape from triangular to circular or (rarely) lobed, and with a long petiole; in species in the sections Populus and Aigeiros, the petioles are laterally flattened, so that breezes easily cause the leaves to wobble back and forth, giving the whole tree a "twinkling" appearance in a breeze.