Assertion: aspen's leaf | /r/HasAspect | silvery or white backsides
Facets:
Source sentences:
text: Leaves tend to have silvery or white backsides and very long leaf stems that make them flop and twist in the wind.
text: The leaves of Populus tend to have silvery or white backsides, and very long leaf stems, which makes it apparent when the wind is blowing through them.