1·Leaves opposite or alternate, petiolate, margin entire.
叶对生或互生，具叶柄，边缘全缘。
2·Trees or shrubs. Leaves petiolate, entire or serrate at margin.
乔木或灌木叶具叶柄，全缘的或有锯齿在边缘。
3·Leaves alternate, petiolate; leaf blade ovate to linear, margin entire or nearly so.
叶互生，具叶柄；叶片卵形到线形，边缘全缘或近全缘。
4·Leaves sessile or shortly petiolate, petiole to 5 mm; perianth tube not pubescent inside.
叶无柄或具短叶柄，对5毫米的叶柄；不青春期的花被筒在里面。
5·Leaves alternate, usually simple, petiolate; leaf blade margin entire or sometimes crenate.
叶互生，通常单叶，具叶柄；叶片边缘全缘或有时具圆齿。
6·Leaves alternate, petiolate, thinly leathery or papery, margin dentate in apical half , rarely entire, lateral veins 2 or 3 pairs, lowest triplinerved.
叶互生，具叶柄，薄革质或纸质，上半部边缘具牙齿，很少全缘，侧脉2或3对，低的离基三出脉。