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Isoetes lacustris (Lake Quillwort) is a species of perennial grass in the family Isoetaceae. It has a self-supporting growth form. It is listed as near threatened by IUCN. Lake Quillwort is native to Alaska, Greenland, the contiguous United States, Canada, the contiguous United States, Saint-Pierre et Miquelon, Greenland, Canada, and Saint-Pierre et Miquelon. It has broad leaves. It is a photoautotroph. Individuals can grow to 0.4 m.

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EOL has data for 16 attributes, including:

Known occurrences, collected specimens and observations of lake quillwort. View this species on GBIF