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Juncus biflorus Elliott. Subgenus: Juncus. Section: Graminifolii. Large Grass-leaved Rush. Phen: Jun-Oct. Hab: Pine savannas, pine flatwoods, mesic areas in sandhill-pocosin ecotones, roadsides, low fields in the Piedmont, wet meadows, interdune swales, freshwater and oligohaline tidal marshes, ditches. Dist: MA to MO, south to FL, TX, Mexico and Central America, and disjunct in South America.

ID notes: Among the members of section Graminifolii, which is recognizable by the flat leaves lacking septa and rounded capsules in heads (glomerules), J. biflorus has the widest leaves, and largest and loosest inflorescence, but this can be very variable within populations. The rhizomes have numerous rhizome scales that are congested along the rhizome overlap.

Origin/Endemic status: Native

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

Synonymy: = AqW, Ar, F, Il, K1, K2, Mi, Mo1, NE, NY, RAB, Tat, Tn, Va, W, WV, Knapp & Naczi (2008); = Juncus aristulatus Michx. var. biflorus (Elliott) Small – S; < Boreojuncus marginatus (Rostk.) Záv.Drábk. & Proćków – Proćków & Záveská Drábková (2023); < Juncus biflorus Elliott – C, G, Pa; < Juncus marginatus Rostk. – FNA22, GW1, K3, K4, Tx, WH3, Kirschner (2002b), Kirschner (2002c)

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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

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image of plant© Bruce A. Sorrie | Original Image ⭷
image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Scott Ward, some rights reserved (CC BY), uploaded by Scott Ward source CC-BY | Original Image ⭷
image of plant© Bruce A. Sorrie | Original Image ⭷
image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Joey Shaw source | Original Image ⭷
image of plant© Joey Shaw source | Original Image ⭷

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