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(First upload on February 17 2015. Last on January 7 2016) [ 日本語 | English ]

Potamogeton L. (ヒルムシロ) Ohirumushiro (オヒルムシロ, 御蛭蓆), floating pondweed Lifeform: aquatic perennial forb Distribution: cosmpolitan in the temperate and cool regions of the Northern Hemisphere, including Japan (rare in the southern part)

Habitat: ponds and slow-streamed reviers ⇒ wetland (湿原) Leaf: developing floating and submergedd leaves Submerged leaf: linear, most leaves lost when flowering ↔ P. distinctus: petiole lanceolate

Potamogeton natans in Hokkaido

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1 2 3
[1] at a riverside veiwing from a canoe in the Bekanbeushi River, eastern Hokkaido, on July 3 2014. Akkeshi Waterfowl Observation Center is not so far from the observation site. [2/3] at an artificial pond in the park of Nakatonbetsu Limestone Caves for Communication with Nature (中頓別鍾乳洞自然ふれあい公園), northern Hokkaido, on August 28 2015. Records: in Shiretoko Five Lakes Aera, eastern Hokkaido, on August 29 2020.