A perennial herb (Polygonum hydropiperoides) growing in marshes and bogs of the United States, having reddish stems, clusters of small greenish flowers, and acrid-tasting leaves.

• 水蓼：一种多年生草本植物（沼泽蓼蓼属），生长在美国的沼泽之中，有红色的茎、串状小绿花和有酸味的叶子