Sharp-pointed Flatsedge, Short Flatsedge, Taper-tip Flatsedge: Cyperus acuminatus (Synonyms: Cyperus acuminatus var. cyrtolepis, Cyperus cyrtolepis) -
Shining Flatsedge: Cyperus bipartitus (Synonyms: Cyperus niger var. rivularis, Cyperus rivularis) -
Asian Flatsedge: Cyperus difformis
Tall Flatsedge: Cyperus eragrostis (Synonym: Cyperus vegetus)
Redroot Flatsedge, Red-root Flatsedge, Red-rooted Flatsedge: Cyperus erythrorhizos (Synonyms: Cyperus cupreus, Cyperus erythrorhizos var. cupreus, Cyperus halei, Cyperus occidentalis, Cyperus washingtonensis) -
Chufa Flatsedge, Yellow Nutgrass, Yellow Nut-grass: Cyperus esculentus var. leptostachyus (Synonyms: Chlorocyperus phymatodes, Cyperus esculentus var. angustispicatus, Cyperus esculentus var. esculentus, Cyperus esculentus var. phymatodes, Cyperus fulvescens, Cyperus phymatodes, Cyperus repens, Cyperus tuberosus) -
Sand Flatsedge, Schweinitz's Flatsedge: Cyperus schweinitzii (Synonyms: Cyperus alterniflorus, Cyperus bushii, Cyperus lupulinus, Cyperus lupulinus ssp. lupulinus, Cyperus lupulinus ssp.. macilentus)
Awned Flatsedge, Bearded Flatsedge: Cyperus squarrosus (Synonyms: Chlorocyperus inflexus, Cyperus aristatus, Cyperus aristatus var. runyonii, Cyperus inflexus, Dichostylis aristata, Mariscus squarrosus) -
False Flatsedge, False Nutsedge, Straw-colored Flatsedge: Cyperus strigosus (Synonyms: Cyperus hansenii, Cyperus stenolepis, Cyperus strigosus var. hansenii, Mariscus stenolepis, Mariscus strigosus) -