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(Upload on August 7 2018) [ 日本語 | English ]

Rumex L. (スイバ) Karfutonodaiou (カラフトノダイオウ, 樺太野大黄), giant dock Lifeform: perennial forb < 2 m in height when matured Distribution: Mongolia - northeastern Asia - eastern Siberia - Far East - Korea - Japan (Hokkaido and central Honshu) Red Data Book: vulnerable (VU) Habitat: wetlands, such has moist valleys, stream banks and flood plains

Leaf: hair on the backside, wider than Rumex longifolius

Rumex gmelinii in Hokkaido

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[1-3] in a flooding area on the upstream of Sarobetsu River, northern Hokkaido, on May 12 2018.