Hypericum japonicum

Hypericum japonicum, known as matted St. John's-wort,[4] is an annual herbaceous flowering plant in the St. John's wort family Hypericaceae, in Hypericum sect. Trigynobrathys.

Hypericum japonicum
Scientific classification Edit this 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 (0.8–2.0 in) tall.[5] Its stems are green and 4-angled, with 2–52 mm (0.1–2.0 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.[6] 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.[7]

The seeds of H. japonicum closely resemble those of the extinct paleospecies Hypericum tertiaerum.[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

References
  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. "FloraBase". florabase.dpaw.wa.gov.au. Retrieved 2018-10-16.
  6. "PlantNET - FloraOnline". plantnet.rbgsyd.nsw.gov.au. Retrieved 2018-10-16.
  7. "Flora of Victoria". vicflora.rbg.vic.gov.au. Retrieved 2018-10-16.
  8. Meseguer, Andrea S.; Sanmartín, Isabel (30 June 2012). "Paleobiology of the genus Hypericum (Hypericaceae): a survey of the fossil record and its palaeogeographic implications". Anales del Jardín Botánico de Madrid. 69 (1): 97–106. doi:10.3989/ajbm.2306. hdl:10261/167029. ISSN 1988-3196.
  9. "Hypericum japonicum Thunb". Plants of the World Online. Retrieved 2018-10-16.
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