Eriophorum viridicarinatum (Engelmann) Fernald. Darkscale Cottonsedge, Darkscale Cottongrass. Phen: May-Aug. Hab: Bogs. Dist: NL (Newfoundland and Labrador) west to AK, south to s. NJ, PA, OH, IN, IL, MN, ND, WY, ID, and WA; reported by Small (1933) for farther south, apparently in error.

Origin/Endemic status: Native

Synonymy: = C, FNA23, GrPl, K1, K3, K4, NE, NY, Pa, S; = Eriophorum viridi-carinatum – F, G, Il, Mi, orthographic variant; < Eriophorum polystachion L. – S13

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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