There are 5-7 whorls in the leaves of P.fuliginosa, which are arranged in feather shape. The color of the small leaves is green white and needle shaped. The submerged leaves are filiform and vermilion red. In winter, the old leaves will wither and fall red. The leaves of green foxtail algae are emerald green, the leaves on the water are feathery, 4-6 whorls, the leaves under the water are filiform, and the color is yellow green.
The height of the plant is about 10-20cm, and the stem is semi tendril. It can grow on the wetland on its prostrate. The upper part of the plant stands on the top of the water surface, and the lower part is the stem in the water, with many branches. And green foxtail algae is taller than the former, about 30 cm, the rhizome prostrate in the water or mud.
