Oplopanax japonicus

Oplopanax japonicus
A Oplopanax japonicus plant in Japan
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
Order: Apiales
Family: Araliaceae
Genus: Oplopanax
Species: O. japonicus
Binomial name
Oplopanax japonicus

Oplopanax japonicus (Nakai) is deciduous shrub that can grow as high as 3 m (9.8 ft) tall. The plant is densely packed with spikes and those spikes are irritant. This species of plant belongs to a genus that is rich in calcium oxalate, which is toxic to the digestive system.[1]

Distribution

Oplopanax japonicus is naturally found in East Asia, specifically in Japan.[2] It is usually found in the coniferous shady forest of Northern Japan.[3] One species is also found in China and North America.[4]

Habitat and Ecology

Oplopanax japonicus grow in woodland garden and dappled shade, shady edge and not in deep shade.The optimal cultivation environment is a moist, well drained and retentive soil.[5]

Morphology

O. japonicus is a hardy frost resistant shrub. It is also the most spiny member of the ginseng family. It forms seldom and randomly branched stems that are approximately 1 m long. Deciduous, can grow up to 3 m (9.8 ft) tall, Branches bulky, with solid yellow-orange prickles. The stem is prickly and stocky. Petiole 3–10 cm (1.2–3.9 in), densely covered with setae. The leaf blade approximately circular to oblate, the leaf is approximately 15–30 cm (5.9–11.8 in) wide, the two surfaces are usually 5–7 lobed. The shape of the lobe is triangular or broadly triangular, base cordate, margin irregularly serrate, apex acute to slightly acuminate.[6] They have ornamental qualities but are armed with spikes. The plant also features spiny leaves and stems.[7]

Flowers and fruit

Flower of Oplopanax japonicus

Flowers of Oplopanax japonicus, is usually hermaphrodite (having both male and female organs).[8] Inflorescence terminal, a raceme of umbels, length of 8–25 cm (3.1–9.8 in), densely covered with setae towards the bae, stiffly covered with tiny hairs throughout; umbels length of 0.9–1.3 cm (0.35–0.51 in) in diameter. Usually 6–12 flower with proximal peduncles that is 2.5 cm (0.98 in) long. Calyx 5-toothed and glabrous. Styles united to middle, slender and apical. Fruit yellow-red at maturity, and sometimes globose.[9]

Food

The leaves and roots of Oplopanax japonicas can be used as food. Young shoots have to be thoroughly peeled and cooked for eating. Roots can be cooked or chewed.[10]

A similar chemical extract belonging to the same family of compound found in Japanese Larch

Herbal medicine

Oplopanax japnicus is used in herbal medicine. The root bark and stem are analgesic, antiphlogistic, antirheumatic, hypoglycaemic and tonic.[11] Oplopanax japonicus was once used in Japan for treating diabetes. Although no cure was recorded by this treatment, it did relieved some patients from their reliance on insulin injection.[12]

From the inner bark of the plant, extracts have been isolated and have shown antibacterial, antiviral, and antifungal activity. The active ingredient has been attributed to several polyynes. In addition, one sesquiterpene has also been isolated and the derivative of the ketone form has been commercially produced in Japan to treat cough.[13] An example of the sesquiterpene that has been isolated and characterized is oplapanone.[14]

References

  1. ↑ "Oplopanax japonicus - (Nakai.)Nakai.". Retrieved 9 April 2012.
  2. ↑ Huang, Wei-Hua; Qing-wen Zhang (23 February 2010). "Isolation and Identification of Two New Polyynes from a North American Ethnic Medicinal Plant--Oplopanax horridus (Smith) Miq.". Molecules. 15: 1089–1096. doi:10.3390/molecules15021089.
  3. ↑ "Oplopanax (Araliaceae)". Retrieved 30 April 2012.
  4. ↑ Flora of China. Science Press (Beijing) and Missouri Botanical Garden Press. 2007. pp. 436–437, 441.
  5. ↑ "Oplopanax (Araliaceae)".
  6. ↑ "Aussiee Gardening- Oplopanax japonicus". Retrieved 9 April 2012.
  7. ↑ "My Garden- Oplopanax japonicus". Retrieved 9 April 2012.
  8. ↑ "Oplopanax japonicus". Retrieved 9 April 2012.
  9. ↑ "Oplopanax" (PDF). Harvard University Press. Retrieved 2012-04-27.
  10. ↑ "Herbal Databse - Oplopanax Japonicus". Retrieved 9 April 2012.
  11. ↑ "Herb latin name: Oplopanax japonicus". Retrieved 9 April 2012.
  12. ↑ "Plant of the Month". Retrieved 9 April 2012.
  13. ↑ Small, Ernest (1999). Canadian Medicinal Crops. National Research Council of Canada. ISBN 0-660-17534-7.
  14. ↑ Takeda, Ken'ichi; H. Minato; M. Ishikawa (1966). "Studies on sesquiterpenoids—XII ☆: Structure and absolute configuration of oplopanone, a new sesquiterpene from oplopanaxjaponicus (NAKAI) NAKAI". Tetrahedron. 22: 219–225. doi:10.1016/s0040-4020(01)99108-2.
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