*Cyperus serotinus Rottbøll. Tidalmarsh Flatsedge. Phen: Jun-Aug. Hab: Tidal marshes. Dist: Native of Eurasia. Reported as naturalized in s. NJ, DE, and PA (FNA, Kartesz 1999).
ID notes:Macroscopically C. serotinus most closely resembles C. rotundus; in addition to the wetland habitat and dorsiventrally compressed achenes, it has spikelets that are more compressed (lanceoloid vs. linear) and is a much more robust plant (5-10 dm vs. 1-4 dm) than the latter species.
Origin/Endemic status: Eurasia
Synonymy: = F, FNA23, K1, K4, Pa; = n/a – C
Wetland Indicator Status:
- Atlantic and Gulf Coastal Plain: OBL
- Eastern Mountains and Piedmont: OBL
- Northcentral & Northeast: OBL
Heliophily: 9
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