a freshwater plant(Pontederia cordata) of eastern North America,having heart-shaped leaves with long petioles and spikes of violet-blue flowers

• 海寿，眼子菜，北美洲东部的一种淡水植物（梭鱼草梭鱼草属），有带有长柄的心形叶和紫蓝色穗状花序