Juncus acuminatus Michaux. Subgenus: Juncus. Section: Ozophyllum. Sharp-fruited Rush. Phen: May-Aug. Hab: In a range of natural and disturbed, saturated and seasonally flooded wetlands. Dist: ME and NS to ON and MN, south to n. peninsular FL, TX, and n. Mexico; S. Mexico and Honduras; BC to CA.

ID notes:Capsules intermediate in size between the larger J. debilis, and the smaller and J. elliottii. Capsules light-tan in J. debilis and deep chestnut to nearly black in J. elliottii.

Origin/Endemic status: Native

Taxonomy Comments: Applequist (2024) reported the recommendation of the Nomenclatural Committee for Vascular Plants to conserve Juncus acuminatus Michaux 1803 over Juncus acuminatus Balbis 1801-1802.

Synonymy: = AqW, C, ETx1, F, FNA22, G, GrPl, GW1, Il, K1, K2, Meso6, Mi, Mo1, NcTx, NE, NY, Pa, RAB, S, Tat, Tn, Tx, Va, W, WH3, WV, Bridges & Orzell (2008), Kirschner (2002b), Kirschner (2002c); = Verojuncus acuminatus (Michx.) Záv.Drábk. & Proćków – Proćków & Záveská Drábková (2023)

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: OBL
• Eastern Mountains and Piedmont: OBL
• Great Plains: OBL
• Midwest: OBL
• Northcentral & Northeast: OBL

Heliophily: 8