Hypericum japonicum
| 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[4] | |
Hypericum japonicum, also known as matted St. John's-wort[3] or Japanese St. John's wort,[5] is an annual herb in Hypericum sect. Trigynobrathys.
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.[4]
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.[4]
Full distribution listing
Reference
- ^ Research, Landcare. "NZOR Name Details - Hypericum japonicum Thunb". www.nzor.org.nz. Retrieved 2018-10-16.
- ^ "TaiBNET". taibnet.sinica.edu.tw. Retrieved 2018-10-16.
- ^ a b "Hypericum japonicum (HYPJA)[Overview]| EPPO Global Database". gd.eppo.int. Retrieved 2018-10-16.
- ^ a b c "Nomenclature | Hypericum online". hypericum.myspecies.info. Retrieved 2018-10-16.
- ^ "Japanese St.Johnswort (Hypericum japonicum)". iNaturalist.org. Retrieved 2018-10-16.
- ^ "FloraBase". florabase.dpaw.wa.gov.au. Retrieved 2018-10-16.
- ^ "PlantNET - FloraOnline". plantnet.rbgsyd.nsw.gov.au. Retrieved 2018-10-16.
- ^ "Flora of Victoria". vicflora.rbg.vic.gov.au. Retrieved 2018-10-16.
- ^ "Hypericum japonicum Thunb. | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 2018-10-16.
