2. Leaves basal or on short stem, usually distichous equitant, sometimes spaced, basally distinctly petiolate or not; 叶基生的或在短茎,通常套折,有时隔开,明显有叶柄与否;
3. Leaves scaly, opposite or alternate and distichous or spiraled, sometimes whorled, rarely contorted or clustered, without stomata. 叶鳞片状,对生或者互生并二列或螺旋,有时轮生,很少扭曲或丛生,没有气孔。