Great St. Johnswort

Hypericum ascyron

  • Great St. Johnswort
  • Great St. Johnswort
  • Great St. Johnswort
  • Great St. Johnswort
  • Great St. Johnswort
  • Great St. Johnswort
  • Flower name
    Great St. Johnswort
  • Scientific name
    Hypericum ascyron
  • Aliasクサビヨウ, 巴草, 草未央, ヒペリカム・アスキロン, Great St. Johnswort, Hypericum ascyron
  • Place of originJapan
  • Place of floweringFields and footpaths
  • Flowering seasonJuly, August, September

What is Great St. Johnswort

Great St. Johnswort (Scientific name: Hypericum ascyron) is a cold-resistant perennial grass of the family Hypericaceae native to Japan. It grows naturally in grasslands and riverbeds. The stem is hairless and has four ridges. The leaves are needle-shaped, with opposite living, hugging the stem at the base. In the summer, the upper part of the stem is branched, 2 the outcropping inflorescences are extended, and five petals like bunches of five yellow bamboos (shaped like a comma) bloom. Flowers are flowers all day.
Although it is a plant which is not alike,Prickly Umbrella(scientific name: Wercklea ferox) makes flowers bloom in a bamboo shape.

Common name: Great St. Johnswort, Scientific name: Hypericum ascyron, aka: Great St. Johnswort, Hypericum ascylon, Origin: Japan, Leaf shape: oblong shape to needle shape, leaf blade: 4 to 8 cm, leaf color: green → autumn leaves → deciduous leaves, grass high: 50 to 130 cm , Flower diameter: 4 to 6 cm, flower season: July to September, flower color: yellow, flower shape: windmill type, number of pistols: 1, 5 cardiac skin, stamens number: 13 or more, fruit shape: conical shape.


  • Eye
    Malpighiales
  • Family
    Hypericaceae
  • Genus
    Hypericum
  • Species
    H. ascyron
  • Type of flower
    Radial symmetrical flower
  • Array of flower
    Monopetal inflorescence
  • Petal shape
    Five-petal
  • Leaf type
    lanceolate
  • Edge of the leaf
    All edges
  • Life typecold-resistant perennial grass
  • Flower colorsWhite Yellow
  • Colors of the leavesGreen
  • Fruit colorGreen
  • Height50.0 ~ 130.0 cm
  • Diameter of flower4.0 ~ 6.0 cm

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