Hypericum japonicum

Hypericum japonicum, also known as matted St. John's-wort[4] or Japanese St. John's wort,[5] is an annual herb in Hypericum sect. Trigynobrathys.

Hypericum japonicum
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Malpighiales
Family: Hypericaceae
Genus: Hypericum
Section: H. sect. Trigynobrathys
Species:
H. japonicum
Binomial name
Hypericum japonicum
Synonyms[2]
  • Brathys japonica (Thunb. ex Murray) Wight
  • H. chinense Osbeck[3]
  • H. jeongjocksanense S.J.Park & K.J.Kim
  • H. mutilum sensu Maxim.
  • Sarothra japonica (Thunb.) Y. Kimura[4]

Description

H. japonicum is unusually small for a St. John's wort, growing only 2–5 cm (0.79–1.97 in) tall.[6] Its stems are green and 4-angled, with 2–52 mm (0.079–2.047 in) long internodes that usually exceed the leaves. The leaves are sessile and spreading and are persistent. The species is 30-flowered with flowers branching from up to three nodes.[7] The flowers are 4–8 mm (0.16–0.31 in) in diameter and their petals are bright yellow or orange. The species' stamens number 5-30 in irregular groups or in five groups when few in number. Its seeds are approximately 50 mm (2.0 in) long.[2]

The species flowers primarily from October-March.[8]

Distribution

The species is found across the Indian subcontinent, China, Southeast Asia, and Oceania.[9] It has been recorded as occurring in Hawaii, however it was determined that this was an error.[2]

Full distribution listing

Reference
  1. Research, Landcare. "NZOR Name Details - Hypericum japonicum Thunb". www.nzor.org.nz. Retrieved 2018-10-16.
  2. "Nomenclature | Hypericum online". hypericum.myspecies.info. Retrieved 2018-10-16.
  3. "TaiBNET". taibnet.sinica.edu.tw. Retrieved 2018-10-16.
  4. "Hypericum japonicum (HYPJA)[Overview]| EPPO Global Database". gd.eppo.int. Retrieved 2018-10-16.
  5. "Japanese St.Johnswort (Hypericum japonicum)". iNaturalist.org. Retrieved 2018-10-16.
  6. "FloraBase". florabase.dpaw.wa.gov.au. Retrieved 2018-10-16.
  7. "PlantNET - FloraOnline". plantnet.rbgsyd.nsw.gov.au. Retrieved 2018-10-16.
  8. "Flora of Victoria". vicflora.rbg.vic.gov.au. Retrieved 2018-10-16.
  9. "Hypericum japonicum Thunb. | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 2018-10-16.
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