An aquatic plant of the genus Myriophyllum having feathery underwater leaves and small inconspicuous flowers. Analysis on leakage risk of large diameter PCCP pipeline for South-to-North Water Transfer Project 聚藻属水生草本植物的任一种,生有羽状、带小裂口的水下叶片和完整或状的伸出水面的叶片。南水北调大口径PCCP管道漏水风险分析