Juncus Juncus (scientific name: Juncus Juncus), the scientific name of traditional Chinese medicine, is a perennial herbaceous aquatic plant with short underground stems, creeping stems, erect stems, cylindrical and solid stems, brown stems at the base, degenerated into scaly sheath leaves, spikes, terminal, pseudolateral stems, stem-like basal bracts, 2 bracteoles under flowers and 6 perianth lobes. Capsule brownish yellow, ovoid or oval, yellow seeds, obovate. Juncus Juncus is also a medicinal plant, and its stem pith or whole grass has the effects of clearing heat, promoting diuresis and infiltrating dampness, and can be used for gonorrhea, edema, upset insomnia, laryngitis, trauma and so on.