Growing up by a stream beside a mountain road?

That's it. Nodular, slightly curved grass. Sponge core, so it was often used to make wicks in the 1980s and 1990s. This sponge core has medicinal value after drying in the sun.

Juncus (scientific name: Juncus? Hervestus), a traditional Chinese medicine name, is a perennial herb aquatic plant with short underground stems, creeping, upright stems clustered in clusters, cylindrical and solid, brown stems at the base, degenerated into scaly sheath leaves, spikes, terminal and pseudolateral stems, with basal bracts extending like stems, 2 bracteoles under flowers, 6 perianth lobes, 3 stamens and 3 pistil stigmas forked. 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.