also: こごめかやつり
noun
rice flat sedge; Cyperus iria
A species of sedge found in rice paddies and wet areas; the name is a botanical term.
田んぼにコゴメガヤツリが生えている。
Rice flat sedge is growing in the rice paddy.
The name コゴメガヤツリ literally means 'small rice mosquito net hanging', likely from the appearance of the seed heads. The exact derivation is uncertain.