Eleocharis ambigens Weatherby. Phen: Jul-Sep. Hab: Brackish tidal marshes. Dist: MA south to n. FL, west to TX.

ID notes:Eleocharis ambigens has achenes that are more prominently pitted, or honeycomb reticulate compared to the more smooth or minutely pitted achenes of E. uniglumis. It also has biconvex achene bodies (1.3-)1.6-1.8 mm long compared to the trigonous (even if obscurely so) achene bodies of E. fallax that are shorter in length (0.9-1.1 mm). Much of the material formerly determined as (misunderstood) E. fallax throughout the outer southeastern coastal plain is likely E. ambigens or E. montevidensis. Refer to Sorrie and LeBlond (2014) for more details.

Origin/Endemic status: Native

Synonymy: = F, FNA23, G, NE, NY, Tat; < Eleocharis fallax Weath. – C, GW1, K1, K3, K4, RAB, Va, WH3

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: OBL (taxonomic split from wetland indicator species)
• Great Plains: OBL (taxonomic split from wetland indicator species)
• Northcentral & Northeast: OBL (taxonomic split from wetland indicator species)

Heliophily: 9