名詞 bract:

1. a modified leaf or leaflike part just below and protecting an inflorescence

bract

n.（名詞）
A leaflike or scalelike plant part, usually small, sometimes showy or brightly colored, and located just below a flower, a flower stalk, or an inflorescence.
苞片，苞：植物的葉狀或鱗狀部分，通常較小，有時(shí)呈艷麗或顏色鮮艷，附生在花、花柄或花序的正下方

來(lái)源：
From Latin bractea [gold leaf]
源自 拉丁語(yǔ) bractea [金葉]
perhaps from Greek brakhein [to rattle]
可能源自 希臘語(yǔ) brakhein [格格作響]

【引伸】
brac.teal