Assertion: birch's leaf | /r/HasProperty | smooth
Facets:
value: on the upper side
type: LOCATION
value: on the upper surface
type: LOCATION
Source sentences:
text: The leaves are dark green and smooth on the upper surface; the lower surface is often pubescent on the veins.
text: The plant has woolly branches with narrow leaves which are smooth on the upper side, providing them with insulation against the cold climate of the Tundra.
text: The young leaves are deep maroon in color, while mature leaves are lustrous, smooth, and dark green.