Eleocharis quadrangulata (Michaux) Roemer & J.A. Schultes. Squarestem Spikerush. Phen: Jun-Sep. Hab: Pools, marshes. Dist: MA west to ON and MI, south to n. FL and TX.

Origin/Endemic status: Native

Taxonomy Comments: A rare, apparently infertile hybrid between E. cellulosa and E. quadrangulata (E. ×inaequilatera D.J. Rosen & C. Reid), with unequally quadrangular culms, has been reported from LA and TX (Rosen and Reid 2015).

Synonymy: = Ar, C, ETx1, FNA23, GrPl, GW1, Il, K1, K3, K4, Mi, Mo1, NcTx, NE, NY, Pa, RAB, S, Tat, Tn, Tx, Va, WH3, WV, Angelo, Rosen, & Lange (2020); > Eleocharis quadrangulata (Michx.) Roem. & Schult. var. crassior Fernald – F, G; > Eleocharis quadrangulata (Michx.) Roem. & Schult. var. quadrangulata – F, G

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: OBL
• Eastern Mountains and Piedmont: OBL
• Great Plains: OBL
• Midwest: OBL
• Northcentral & Northeast: OBL

Heliophily: 9