Yellow iris is also known as water candle, yellow iris, aquatic iris, yellow iris, etc. Iris family, Iris genus is a perennial wet or emergent perennial herbaceous plant. The rhizomes of Acorus calamus are thick and robust, with a diameter of up to 2.5 centimeters. The basal leaves are gray green, broad sword shaped, and have distinct midrib. They are 40-60 centimeters long and 1.5-3 centimeters wide; The flower stem is thick and robust, with a height of 60-70 centimeters; Bracts 3-4, membranous, green, lanceolate with prominent ribs and transverse reticular veins. The stem is slightly higher than the leaves, with long elliptical petals and nearly equal width at the base. It has brown markings or no markings, and the flag petals are light yellow. The flower diameter is 8 centimeters. The capsule is elongated and contains many seeds, which are brown in color.