Northeastern Asian Flora
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Sparganium hyperboreum Laest. ex Beurl.  
Family: Typhaceae
[Sparganium affine var. zosterifolium Neuman, moreSparganium hyperboreum var. platyphyllum Neuman, Sparganium natans var. submuticum Hartm., Sparganium submuticum (Hartm.) Neumann, Sparganium williamsii Rydb.]
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  • Japan Flora
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Japan Flora: Stems elongate, submersed; leaves slender, compressed, not keeled, 2-4 mm. wide, obtuse; spikes simple, commonly 2-3 cm. long, the bracts longer than the spikes; pistillate heads 2 or 3, 6,8 mm. in diameter in fruit, the lowest one usually with a supra-axillary peduncle, the staminate heads 1 or 2, close together and closely adjacent to the pistillate heads; fruit ovoid, with a narrowly ovate stigma. Ponds.

Hokkaido (Mount Taisetsu). Subarctic regions.

Sparganium hyperboreum
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Development supported by College of Agriculture and Life Sciences of Seoul
National University and Korea National Arboretum of Korea Forest Service.
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