Ontade

Koenigia weyrichii var. alpinum

  • Ontade
  • Ontade
  • Ontade
  • Ontade
  • Ontade
  • Ontade
  • Ontade
  • Ontade
  • Flower name
    Ontade
  • Scientific name
    Koenigia weyrichii var. alpinum
  • Alias御蓼
  • Place of originan endemic species of Japan
  • Place of floweringHigh mountain, Sub-alpine
  • Flowering seasonJune, July, August, September, October

What is Ontade

Ontade, (scientific name: Koenigia weyrichii var. alpinum) is an endemic species of Japan, and is a variant of the perennial "Urajiro tade" (scientific name: Aconogonon weyrichii) which is a perennial plant inthe family Polygonaceae. It grows naturally on sub-alpine to alpine gravel north of Chubu. Dioecious. In the summer, the flower stalk is put out, the panicles are extended from the shoot apex, and a number of light yellow florets bloom.
In fact, there are no petals and what looks like a flower is the calyx. The name of the flower is based on the first discovery at Mount Ontake in Kiso. On the back of the leaf of Urajiro tade(K. weyrichii ), white hair grows and looks whitish, while Ontade(var. alpinum) is green because it is hairless.

Generic name: Ontade, scientific name: Koenigia weyrichii var. Alpinum, Synonym: Aconogonon weyrichii var. Alpinum, Also: Iwatade, Plant height: 30 to 100 cm, leaf height: 10 to 20 cm, leaf shape: oval to long oval, with a sharp tip, Flowering period: June to October, flower diameter (actual calyx): 0.3 to 0.5 cm, Fruit type: thin.


  • Eye
    Caryophyllales
  • Family
    Polygonaceae
  • Genus
    Koenigia
  • Species
    A. weyrichii var. alpinum
  • Type of flower
    Radial symmetrical flower
  • Array of flower
    Spikelet inflorescence
  • Petal shape
    Five-petal
  • Leaf type
    lanceolate
  • Edge of the leaf
    All edges
  • Life typeperennial plant
  • Flower colorsWhite
  • Colors of the leavesGreen
  • Fruit colorGreen
  • Height30.0 ~ 100.0 cm
  • Diameter of flower0.3 ~ 0.5 cm

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