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Isoetes lacustris

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Author: Carl Linnaeus, 1757
Origin:  Altay, Austria, Baltic States, Belgium, Bulgaria, Central European Russia, Connecticut, Czechoslovakia, Denmark, East European Russia, Finland, France, Føroyar, Germany, Great Britain, Greenland, Iceland, Ireland, Irkutsk, Labrador, Maine, Manitoba, Netherlands, New Brunswick, Norway, Nova Scotia, Ontario, Poland, Prince Edward Island, Saskatchewan, Spain, Sweden, Switzerland, Tennessee, USA, Vermont, Virginia, West Siberia, Wisconsin
Soil:  Sand
Water:  Max
Sun:  Medium
Thickness:  2,5 Centimetres
Height:  30 Centimetres
Flower:  No; Spores; White - Cream-Coloured
Propagate:  Spores
Names:  Lake Quillwort, Merlin's-grass, Sortgrøn Brasenføde, See-Brachsenkraut, Stivt Brasmegras, Styvt braxengräs
Synonyms:  Calamaria lacustris Kuntze, 1891.
Juncus bufonius,
Carl Linnaeus, 1757.
Isoetes macrospora
Isoetes rossica
Isoetes hieroglyphica, A.A.Eaton.
Isoetes lacustris var. stricta, Motelay & Vendryès
Isoetes moorei, Moore.

This member of the Isoetaceae family was given this name by Carl Linnaeus in 1753. It is found from Canada, through Europe to northern Asia, growing in lakes with little nutrition from five centimetres to five meters debt. The caudex can grow to one and a half centimetre, the leaves to 40 centimetres length. 

The genera name means 'all the same year round'. The species name; lacustris, from the Latin lacus; 'lake', and ustris; 'origin'.

Also seen as member of the Juncaceae  and Lycopodiaceae  families.