Oplopanax japonicus explained

Oplopanax japonicus is species of deciduous shrub that can grow as high as 3m (10feet) tall. The plant is densely packed with spikes and those spikes are irritant. This species 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

Oplopanax 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 1m (03feet) long. Deciduous, can grow up to 3m (10feet) tall, Branches bulky, with solid yellow-orange prickles. The stem is prickly and stocky. Petiole 3–, densely covered with setae. The leaf blade approximately circular to oblate, the leaf is approximately 15– 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

Flowers of Oplopanax japonicus, is usually hermaphrodite (having both male and female organs).^[8] Inflorescence terminal, a raceme of umbels, length of 8–, densely covered with setae towards the bae, stiffly covered with tiny hairs throughout; umbels length of 0.9– in diameter. Usually 6–12 flower with proximal peduncles that is 2.5cm (01inches) 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]

Herbal medicine

Oplopanax japonicus is used in herbal medicine.^[11] A sesquiterpene has been isolated and a synthetic derivative of the ketone form has been commercially produced in Japan to treat cough.^[12]

Chemical constituents

An example of a sesquiterpene that has been isolated and characterized is oplapanone.^[13]

Notes and References

1. Web site: Oplopanax japonicus - (Nakai.)Nakai.. 9 April 2012.
2. Huang. Wei-Hua. Qing-wen Zhang. Isolation and Identification of Two New Polyynes from a North American Ethnic Medicinal Plant--Oplopanax horridus (Smith) Miq.. Molecules. 23 February 2010. 15. 2. 1089–1096. 10.3390/molecules15021089. 20335964. 6263199. free.
3. Web site: Oplopanax (Araliaceae). 30 April 2012.
4. Book: Flora of China. limited. 2007. Science Press (Beijing) and Missouri Botanical Garden Press. 436–437, 441.
5. Web site: Oplopanax (Araliaceae).
6. Web site: Aussiee Gardening- Oplopanax japonicus. 9 April 2012.
7. Web site: My Garden- Oplopanax japonicus. 9 April 2012.
8. Web site: Oplopanax japonicus. 9 April 2012.
9. Web site: Oplopanax. Harvard University Press. 2012-04-27.
10. Web site: Herbal Databse - Oplopanax Japonicus. 9 April 2012.
11. Web site: Plant of the Month. 9 April 2012.
12. Book: Small, Ernest. Canadian Medicinal Crops. 1999. National Research Council of Canada. 0-660-17534-7.
13. Takeda. Ken'ichi. H. Minato . M. Ishikawa . Studies on sesquiterpenoids—XII: Structure and absolute configuration of oplopanone, a new sesquiterpene from oplopanax japonicus (NAKAI) NAKAI . Tetrahedron . 1966 . 22 . 219–225 . 10.1016/s0040-4020(01)99108-2 .