Leaves opposite, petiolate or more rarely sessile; petioles up
to 1.5 cm long, glabrous or more rarely pubescent, often with cork rings, bases distinctly
articulate; blades elliptic to obovate, more rarely ovate, apex usually acuminate but sometimes
acute or obtuse, base attenuate to cordate, chartaceous to coriaceous, drying greenish to
grayish to blackish brown, glabrous above, glabrous or more rarely pubescent underneath,
the pubescence then restricted to the nerves or present on the whole surface; 6–14 pairs of
lateral nerves; intersecondaries reticulate; margin entire and (somewhat) revolute.