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Isoetes lacustris Linnaeus. Lake Quillwort. Phen: Jul-Sep. Hab: Submerged in lakes and permanent streams. Dist: Apparently extirpated from the historic locality in VA.

Origin/Endemic status: Native

Taxonomy Comments: A decaploid species (2n=110).

Synonymy: = AqW, C, FNA2, K1, K3, K4, NY, Va; > Isoetes macrospora – F, G, W

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Wetland Indicator Status:

  • Eastern Mountains and Piedmont: OBL
  • Midwest: OBL
  • Northcentral & Northeast: OBL

Heliophily: 8

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image of plant© Alan Cressler: Isoetes lacustris, Piseco Lake, Little Sand Point State Campground, Adirondack Park, Hamilton County, New York 3 by Alan Cressler source | Original Image ⭷

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