noun
water pepper (Persicaria hydropiper f. aquaticum)
A specific aquatic form of water pepper. Cross-referenced with 柳蓼 (やなぎたで), a related plant.
See also: 柳蓼 (やなぎたで)
川蓼は湿地に生える一年草です。
Water pepper is an annual plant that grows in wetlands.
A related species of water pepper; 川蓼 is specifically the aquatic form Persicaria hydropiper f. aquaticum.
The name 川蓼 literally means 'river smartweed', reflecting its habitat. The exact historical derivation is uncertain.