花被片：tepal 当萼片(sepal)和花瓣(petal)长的很像而无法分辨的时候，我们将萼片和花瓣合称花被片(tepals)。“when ,as in this lily flower ,the sepals and petals look the same ,they are known as perianth segments,or tapals."(《Eyewitness Plant》by DK )
There are significant resemblances between Sparganium and Typha whereas their tepal development shows remarkable differences.
黑三棱属与香蒲属有显著相似之处，但花被片的发生区别较大。
参考来源 - 香蒲目营养器官解剖、花发育及其进化生物学意义·2,447,543篇论文数据，部分数据来源于NoteExpress
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