Juncus marginatus Rostkovius. Subgenus: Juncus. Section: Graminifolii. Common name: Grass-leaved Rush. Phenology: Jun-Sep. Habitat: Wet meadows, bogs, generally throughout in wet, sandy or peaty soil. Distribution: NS to ON, MI, and NE, south to s. peninsular FL and TX; disjunct in CA and in South America.

ID notes: Among section Graminifolii, which is recognizable by the flat leaves lacking septae and rounded capsules in heads (glomerules), J. marginatus is more delicate in nature than either J. biflorus or J. longii. When growing in a cespitose fashion the rhizomes are short or absent. Individuals can be solitary with a rhizome present.

Origin/Endemic status: Native

Taxonomy Comments: See Knapp & Naczi (2008) for clarification of the Juncus marginatus complex.

Synonymy ⓘ: = AqW, Ar, C, Can, ETx1, G, GrPl, Il, Mi, Mo1, NcTx, NE, NY, Pa, RAB, S, Tat, Tn, Va, W, WV; = Boreojuncus marginatus (Rostk.) Záv.Drábk. & Proćków — Proćków & Záveská Drábková (2023); < Juncus marginatus Rostk. — FNA22, GW1, K4, Tx, WH3, Kirschner (2002b), Kirschner (2002c), Knapp & Naczi (2008); > Juncus marginatus Rostk. — G; > Juncus marginatus Rostk. var. marginatus — F; > Juncus marginatus Rostk. var. setosus Coville — F; > Juncus setosus (Coville) Small — G; Juncus marginatus Rostk. Basionym: Juncus marginatus Rostk. 1801

Links to other floras: < Juncus marginatus - FNA22

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FACW (taxonomic split from wetland indicator species)
• Eastern Mountains and Piedmont: FACW (taxonomic split from wetland indicator species)
• Great Plains: FACW (taxonomic split from wetland indicator species)
• Midwest: FACW (taxonomic split from wetland indicator species)
• Northcentral & Northeast: FACW (taxonomic split from wetland indicator species)

Heliophily ⓘ: 8