Olive Leaf
vs. Oleaster Leaf
Perhaps it was not an olive twig,
but rather a stem of oleaster, lokh, that could have easily
been mistaken to be from an actual olive tree.
Oleaster is present in Armenia today.
Consider also that Noah was 501 years old when
identifying the twig so maybe his eyesight was failing <g> or
he did not know today’s scientific name
ArcImaging - The Search For Noah's Ark