Cyperus compressus Linnaeus. Poorland Flatsedge. Phen: Jul-Sep. Hab: Sandy fields, disturbed areas. Dist: Pantropical and warm temperate, north in North America to s. NY, s. OH, s. IL, and e. TX, the northern extent of the native range uncertain. Reported for s. IN by Bill Thomas (pers.comm., 2022).

ID notes:Occasionally mistaken for a member of subgenus Pycreus. The dark black, obviously trigonous achenes and mucronate scales distinguish it easily under a hand lens.

Origin/Endemic status: Native

Synonymy: = Ar, Bah, C, ETx1, F, FNA23, G, GW1, Il, K1, K3, K4, Mex, Mo1, NcTx, NY, Pa, RAB, S, Tat, Tn, Tx, Va, W, WH3

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Wetland Indicator Status:

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

Heliophily: 9