Juncus longii Fernald. Subgenus: Juncus. Section: Graminifolii. Phen: Jun-Aug. Hab: Usually in very wet, often inundated sites, bogs, ditches, rooting in clay or peat. Dist: MD south through VA, NC, SC to s. MS and se. LA (Urbatsch 2013), mainly in the Coastal Plain; disjunct inland in boggy sites, as in w. NC, nc. GA, TN, and n. AL (Knapp & Naczi 2008, more extensive distributions are based on misattribution).
ID notes:Among section Graminifolii, which is recognizable by the flat leaves lacking septae and rounded capsules in heads (glomerules), J. longii has a very dense and congested inflorescence. The rhizomes are long with well-spaced rhizome scales.
Origin/Endemic status: Endemic
Taxonomy Comments: See Knapp & Naczi (2008) for clarification of the Juncus marginatus complex.
Synonymy: = F, K1, K3, K4, RAB, Tn, Va, Knapp & Naczi (2008); = Juncus aristulatus Michx. var. aristulatus – S; < Juncus biflorus Elliott – C, G; < Juncus marginatus Rostk. – FNA22, GW1, WH3, Kirschner (2002b)