Great St. Johnswort

  • Great St. Johnswort_img_0
    Great St. Johnswort @ Hakobe Botanical Garden
  • Great St. Johnswort_img_1
    Great St. Johnswort @ Hakobe Botanical Garden
  • Great St. Johnswort_img_2
    Great St. Johnswort @ Oze

Basic information

Flower Name
Great St. Johnswort
Formal Name
Hypericum ascyron
Alias
Hypericum ascyron
Habitat
Japan
Morph
cold-resistant perennial grass

Comment

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.

Detailed information

Order
Malpighiales
Family
Hypericaceae
Genus
Hypericum
Species
H. ascyron
Flower type
Actinomorphic Flower
Flower array
Solitary Inflorescence
Petal shape
5petals
Leaf type
Lanceolate
Leaf edge
Entire Fringe
Flowering place
Plain/fleet
Color
Yellow
Season
JulAugSep
Height
50 ~ 130 [cm]
Diameter
4 ~ 6

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