How to identify Ricefield flatsedge (Cyperus iria)
Ricefield flatsedge, also known as Umbrella sedge
Ricefield flatsedge is characterized by its clustered, tufted growth habit, thriving as an annual or perennial. This sedge exhibits narrow, grass-like leaves and triangular stems, typically reaching up to 3 feet (about 90 cm) in height. The inflorescences consist of umbrella-like clusters of small, greenish flowers that bloom in summer and fall. The plant's fibrous root system is well-adapted to saturated soils found in its preferred habitats.
Lifespan: Annual, Perennial
Plant Type: Grass
Leaf Type: Semi-evergreen
Triangular stems up to 3 feet (90 cm) tall distinguish ricefield flatsedge from other plants.
Umbrella-like clusters of greenish flowers in summer and fall are unique to ricefield flatsedge.
Golden-brown spikes holding open compound umbels make ricefield flatsedge easily identifiable.
Distinctive shiny brown achenes with a tri-angled shape aid in ricefield flatsedge identification.
V-shaped, scabrid leaves with reddish-brown bases are key features of ricefield flatsedge.
The flat, lance-linear green leaves of ricefield flatsedge are V-shaped and measure roughly 4–8 inches (10–20 cm) in length. The leaf margins and mid-rib are scabrid, featuring small, sharp projections. The leaf sheaths are green, stained reddish-brown at the base, and they wrap around the stem but are shorter than it. This unique combination of features makes the leaves of ricefield flatsedge recognizable and distinctive.
The flowers of ricefield flatsedge are produced in open, compound umbels, held on golden-brown spikes that are typically sessile and elongated. Each flower cluster is subtended by 4-7 leaf-like bracts. The spikes exhibit a striking golden to yellowish-green hue. These unique clusters serve as a distinguishing characteristic of ricefield flatsedge, presenting a notable contrast in color and texture. Their distinct appearance aids in the identification of ricefield flatsedge, making them a vital feature for plant enthusiasts.
The stem of ricefield flatsedge is characterized by its roughly triangular shape, providing a distinctive appearance that aids in identification. The stems are solid and robust, measuring approximately 0.12 to 0.4 inches (3 to 10 mm) in thickness. Exhibiting a vibrant green color, they contribute to the plant's lush appearance. The culms of ricefield flatsedge are unbranched, smooth to the touch, and display a consistent texture along their length, which includes no significant knots or irregularities.
The fruit of ricefield flatsedge is a distinctive, shiny brown achene that stands out with its obovoid shape and tri-angled appearance. Each fruit measures approximately 0.1 inches (2-3 mm) in length, presenting a three-sided structure said to be crucial for identification. The surface of the achene is notably smooth, which gives it a lustrous finish. Despite its small size, the unique form and polished texture make the fruit of ricefield flatsedge a significant feature for those interested in plant identification.
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Scientific Classification of Ricefield flatsedge
