<i>Acer platanoides</i> leaf - 10.5 inches wide. Yes I did shop-in the ruler, but both leaf and ruler were scanned at the same resolution
<a href="//commons.wikimedia.org/wiki/User:Nonenmac" title="User:Nonenmac">Randy Nonenmacher</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>