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*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

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Wetland Indicator Status:

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

Heliophily: 9

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image of plant© Karl Feng, some rights reserved (CC BY-NC), uploaded by Karl Feng source CC-BY-NC | Original Image ⭷ Warning: was NOT research grade.
image of plant© proullard, some rights reserved (CC BY-NC), uploaded by proullard source CC-BY-NC
image of plant© Anastasia Davydova, some rights reserved (CC BY-NC), uploaded by Anastasia Davydova source CC-BY-NC | Original Image ⭷


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