Juncus alpinoarticulatus Chaix ssp. americanus (Farwell) Hämet-Ahti. Subgenus: Juncus. Section: Ozophyllum. Northern Green Rush. Hab: Shores, calcareous seeps, including slumps along Lake Erie. Dist: Greenland, NL, NT, and AK, south to ME, n. NH, n. VT, NY, nw. PA, n. OH, n. IN, ne. IL, w. MO, NE, n. AZ, s. UT, and WA; ne. Asia.

ID notes:Juncus alpinoarticulatus is much like J. articulatus but separated by the rounded to obtuse capsules and stiffly ascending inflorescence branches. Juncus alpinoarticulatus ssp. americanus is distinguished from ssp. fuscescens in having individual long-pedicellate (2-4 mm long) flowers.

Origin/Endemic status: Native

Synonymy: = K4, NE, NeUS, NY; = Verojuncus alpinoarticulatus (Chaix) Záv.Drábk. & Proćków ssp. americanus (Farw.) Záv.Drábk. & Proćków – Proćków & Záveská Drábková (2023); < Juncus alpinoarticulatus Chaix – AqW, C, FNA22, K3, Mi, Mo1; >< Juncus alpinoarticulatus Chaix ssp. fuscescens (Fernald) Hämet-Ahti – Il; >< Juncus alpinoarticulatus Chaix ssp. nodulosus (Wahlenb.) Hämet-Ahti – Pa; < Juncus alpinus Vill. – GrPl; >< Juncus alpinus Vill. var. fuscescens Fernald – F

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Wetland Indicator Status:

• Great Plains: OBL (taxonomic split from wetland indicator species)
• Midwest: OBL (taxonomic split from wetland indicator species)
• Northcentral & Northeast: OBL (taxonomic split from wetland indicator species)

Heliophily: 9