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。

Leaves sessile or shortly petiolate, petiole to 5 mm; perianth tube not pubescent inside.

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三者之间无显著差异，并且它们的雌花都具有由一至三枚小鳞片组成的花被。

There are no significant differences among the three species, and their female flowers are all provided with a perianth of one to three small scales.

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