為多年生沉水型草本植物,具有走莖,葉為線形,像韭菜,花為單性花,雌花花柄呈螺旋狀,線形,挺出水面開花,雄佛燄苞在水下,為卵形,雄花多數,成熟時會裂開,讓花粉浮於水面與雌花授粉。
苦草完全沉在水裡生長,它的葉片非常柔軟,才能不讓水流把葉子沖斷,由於許多天然的溪流和水溝越來越少,苦草的族群也逐漸減少。
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