Shining Flatsedge, Slender Flatsedge: Cyperus bipartitus (Synonyms: Cyperus niger var. rivularis, Cyperus rivularis) -
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 (Synonym: Cyperus esculentus var. esculentus) -
Great Plains Flatsedge: Cyperus lupulinus ssp. lupulinus (Synonyms: Cyperus bushii, Cyperus lupulinus ssp. macilentus, Cyperus schweinitzii) -
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) -
Midland Sand Sedge: Cyperus xmesochorus (Synonym: Cyperus schweinitzii var. uberior) -