Ricefield flatsedge (Cyperus iria)

Ricefield flatsedge (Cyperus iria) is a smooth, tufted annual sedge frequently found in rice paddies and is known for its vigorous growth. This weed can cause significant issues in rice fields, particularly across Asia. It is identified by its slender, upright stems, narrow grass-like leaves, yellowish inflorescence, and yellowish-red roots. Its adaptability to wet, flooded environments and ability to reproduce through seeds and rhizomes make it a persistent problem in rice cultivation.