本区基性、超基性岩岩脉群的出露，从北向南可归纳为三个岩桨岩带。
There are three magmatic zones of clusters of basic and ultrabasic rocks from north to south in this area.
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。
Leaves alternate, petiolate, thinly leathery or papery, margin dentate in apical half , rarely entire, lateral veins 2 or 3 pairs, lowest triplinerved.
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