花被片

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 )