Cyperus dubius, commonly known as Dubious Flat Sedge or Dubious Galingale, is a perennial herb native to tropical regions of Africa, Asia, and Australia. It thrives in wetlands, marshes, and along the edges of water bodies, where it forms part of the natural aquatic and semi-aquatic vegetation. This sedge typically grows to a height of 0.5-1 feet (0.15-0.3 meters) and features grass-like clumps of green, linear leaves. The flowers are green and inconspicuous, blooming in the summer, and are arranged in compound umbels, which may be of interest to those who appreciate subtle floral displays.

Dubious Flat Sedge is valued for its ability to stabilize soil and filter water, making it useful for erosion control and water purification in constructed wetlands. It is also used in water gardens and as a ground cover in boggy areas. In cultivation, it requires full sun to part shade and prefers slow-draining clay or loam soils. It is a low-maintenance plant that needs consistent moisture and can tolerate standing water. While not commonly grown for ornamental purposes, its texture and form can add interest to water features or naturalistic plantings.CC BY-SA 4.0