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Cyperus erythrorhizos Muhlenberg. Redrooted Flatsedge. Phen: Jul-Dec. Hab: Marshes, ditches, shores, mud flats. Dist: MA west to ND and WA, south to n. FL, LA, TX, AZ, CA, and Mexico (BCN, TAB, TAM).

ID notes: This species is frequently confused with C. odoratus, with which it is often closely associated. The neatly quadrangular spikelets with tiny (≤ 1.5 mm), closely imbricate scales (vs. terete, jointed spikelets with > 2 mm, loosely spaced scales) easily distinguish even depauperate plants of C. erythrorhizos at a glance.

Origin/Endemic status: Native

Syn: = Ar, C, ETx1, F, FNA23, G, GrPl, GW1, Il, K1, K3, K4, Mex, Mi, Mo1, NcTx, NE, NY, Pa, RAB, Tn, Tx, Va, W, WH3, WV; > Cyperus erythrorhizos Muhl. – S; > Cyperus halei Torr. ex Britton – S

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image of plant© Bruce A. Sorrie | Original Image ⭷
image of plant© Erik Danielson source | Original Image ⭷
image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Keith Bradley | Original Image ⭷
image of plant© Radford, Ahles and Bell | Original Image ⭷