The shape of sunflower leaves is an egg-shaped or heart-shaped leaves. The texture is smooth, but on some sunflower leaves it is rough.
The leaves of Betula populifolia are smooth on the lower surface.
smooth and not peeling
smooth
Willow leaves are smooth-edged.
smooth surface.
on a smooth surface
jagged
Smooth surface
Smooth.
the answer is the plant has very hairy smooth leaves.
It scratches a thin layer of the surface off whatever is being etched, and leaves a pattern behind which differs from the smooth surface, revealing the design.