bracteoid

例句：

1. 1.The bracteoids on the flower are essential for pollination.
   花朵上的花萼对于授粉至关重要。
2. 2.The plant's bracteoids are used as a natural pesticide.
   这种植物的花萼被用作天然的杀虫剂。
3. 3.The bracteoids of this species are unique and have been studied extensively.
   这种物种的花萼独特，已经进行了广泛的研究。