Juncus filiformis Linnaeus. Subgenus: Agathryon. Section: Juncotypus. Thread Rush. Phen: Jun-Aug. Hab: Bogs, wet acid areas. Dist: Circumboreal, south in North America to e. PA, w. PA, ne. WV, n. MI, and n. MN.
ID notes:Of section Genuini (species with lateral inflorescence), this species is easily distinguished by the inflorescence being born near the midpoint of the entire length of the stem+bract, rather than well above the midpoint.
Origin/Endemic status: Native
Synonymy: = AqW, C, F, FNA22, G, K1, K3, K4, Mi, NE, NY, Pa, Zika (2013); = Agathryon filiforme (L.) Záv.Drábk. & Proćków – Proćków & Záveská Drábková (2023)
Wetland Indicator Status:
- Eastern Mountains and Piedmont: FACW
- Great Plains: OBL
- Midwest: FACW
- Northcentral & Northeast: FACW
Heliophily: 9
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