Juncus balticus Willdenow var. littoralis Engelmann. Subgenus: Agathryon. Section: Juncotypus. Baltic Rush. Phen: May-Oct. Hab: Open calcareous wetlands (fens), prairies. Dist: The species is circumboreal; var. littoralis is North American: NL (Labrador) west to BC, south to NY (Long Island), NJ, PA, w. VA, OH, IN, MO, and KS.

ID notes:Of our members of section Genuini (species with a lateral inflorescence), can be distinguished by its acute capsules, stout creeping rhizome, dark perianth, and upwardly sweeping inflorescence branches.

Origin/Endemic status: Native

Synonymy: = F, G, GrPl, K1, Mo1, Tx, Va; = Agathryon balticum (Willd.) Záv.Drábk. & Proćków ssp. littorale (Engelm.) Záv.Drábk. & Proćków – Proćków & Záveská Drábková (2023); = Juncus arcticus Willd. var. littoralis (Engelm.) Boivin – C, Pa; = Juncus balticus Willd. ssp. littoralis (Engelm.) Snogerup – AqW, K3, K4, Mi, NE, NY, Kirschner (2002b), Zika (2013); = n/a – Tat; < Juncus arcticus Willd. var. balticus (Willd.) Trautv. – FNA22, Il; < Juncus balticus Willd. – WV

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: OBL (name change)
• Eastern Mountains and Piedmont: OBL (name change)
• Great Plains: FACW (name change)
• Midwest: OBL (name change)
• Northcentral & Northeast: OBL (name change)

Heliophily: 9