constituting the family Ceratophyllaceae: hornworts
造句
用作名詞(n.)
Any of several submerged plants of the genus Ceratophyllum,forming branched masses in quiet water and having finely dissected,whorled leaves and minute unisexual flowers. 角苔，一種金魚藻屬的水下植物，在風平浪靜時會形成縱橫交錯的樹枝網(wǎng)，生有輪生的多裂葉，開極小的單性花。