Are the leaves opposite each other on the twig? Hint: a missing leaf may make leaves appear to be alternate. Look for a bump or scar where leaves were attached, or look to see if twigs are opposite each other where they attach to the stem.
Option 2
Are the leaves alternate (not opposite each other on the twig)? Hint: some species have alternate leaves attached very close together on short spur shoots. In that case, look to see if twigs are alternate where they attach to the stem.