Japanese Dock

Names and Synonyms

Common Names

• Japanese Dock

Scientific Names

Accepted name

Synonyms

• Rumex japonicus var. sachalinensis
• Rumex crispus subsp. japonicus
• Rumex japonicus var. yezoensis
• Rumex odontocarpus var. japonicus
• Rumex crispus var. japonicus
• Rumex hadrocarpus
• Rumex stenophyllus f. sachalinensis
• Rumex yezoensis
• Rumex cardiocarpus
• Rumex nikkoensis
• Rumex regelii

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae within the phylum Streptophyta and the class Equisetopsida. Classified under the subclass Magnoliidae and the order Caryophyllales, it is a member of the family Polygonaceae. Specifically, it is identified by the genus Rumex as Rumex japonicus.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant exhibits a broad geographical range across several key regions in East Asia. In the Russian Far East, it can be found growing in Kamchatka, Sakhalin, and Primorye. Its presence extends further through the Kuril Islands within the same Russian territory. Additionally, the species is distributed throughout China, specifically in the South-Central regions. Together, these locations define the diverse natural habitats where the plant thrives.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Rumex japonicus is characterized by a wide altitudinal distribution and a preference for specific aquatic and coastal environments. This species thrives in diverse habitats, most notably along rivers, seas, and various types of shores, indicating a strong affinity for riparian and littoral zones. Its elevational range is extensive, spanning from as low as 30 m AMSL to a maximum altitude of 3400 m AMSL, with a mean elevation of approximately 1715 m AMSL. This broad vertical distribution allows the plant to inhabit a variety of ecological niches, from low-lying coastal wetlands to higher-altitude riparian corridors.

Elevational range max:

3400 m AMSL

Elevational range mean:

1715 m AMSL

Elevational range min:

30 m AMSL

Habitat :

rivers, sea, shores

Life history

The life history of Rumex japonicus is characterized by a perennial lifecycle, allowing the plant to persist through multiple growing seasons. As a robust herbaceous species, it undergoes various developmental stages that contribute to its long-term survival and ability to colonize disturbed habitats. Its perennial nature enables it to establish a strong root system, which facilitates regrowth and provides the necessary energy reserves to withstand seasonal environmental fluctuations. This extended lifespan supports continuous reproductive efforts, often involving the production of numerous small seeds that are dispersed to ensure the colonization of new territories.

Lifecycle :

perennial

Morphology

The morphology of Rumex japonicus is characterized by its growth form as a non-woody herb. It is a self-supporting plant that does not exhibit climbing behavior, such as being a liana or vine, and it functions as an independent organism rather than a parasite. In terms of its ecological habit, it is a terrestrial species and does not function as an epiphyte. The plant typically reaches a height ranging from a minimum of 0.5 m to a maximum of 1 m, with a mean plant height of approximately 0.75 m.

Aquatic :

terrestrial

Climber :

self-supporting

Epiphyte :

terrestrial

Growth form :

herb

Parasite :

independent

Plant height max:

1 m

Plant height mean:

0.75 m

Plant height min:

0.5 m

Woodiness :

non-woody

Physiology

The physiology of Rumex japonicus is characterized primarily by its C3 photosynthetic pathway, a mechanism in which carbon fixation occurs through the Calvin cycle without the specialized spatial separation of carboxylation and decarboxylation seen in C4 plants. This C3 metabolism implies that the plant relies on the enzyme Rubisco to fix atmospheric CO2 into organic compounds, a process that is highly efficient under temperate and moist conditions but can be susceptible to photorespiration when temperatures rise or stomatal conductance decreases. The physiological vigor of the plant is further supported by a robust vascular system capable of efficient water and nutrient transport to support its rapid growth cycles. Its metabolic processes are closely integrated with its environmental responses, allowing it to adapt its physiological rate to seasonal fluctuations in light intensity and moisture availability.

Photosynthetic pathway :

C3

Reproduction

The reproduction of Rumex japonicus is characterized by a specific seasonal flowering window and specialized seed dispersal mechanisms. The plant typically enters its flowering stage in August and concludes this reproductive phase in September. Following pollination, it produces small fruits that exhibit a highly consistent size, with a mean, minimum, and maximum fruit length all measured at approximately 0.25 cm. The resulting seeds are minute, possessing a mean mass of 0.00137 g, with individual seed weights ranging from a minimum of 0.00086 g to a maximum of 0.00188 g. To ensure the spread of its progeny, the species employs an anemochorous dispersal syndrome, relying on wind currents to transport its lightweight seeds to new locations.

Dispersal syndrome :

anemochorous

Flowering time :

Aug

Flowering time :

Sep

Fruit length max:

0.25 cm

Seed mass max:

0.00188 g

Seed mass mean:

0.00137 g

Seed mass min:

0.00086 g

Sources: Global Inventory of Floras and Traits (GIFT)

Chemicals

Rumex japonicus has 2 reported phytochemicals identified across 0 scientific publications and several other databases. The most consistently reported chemicals include RUTIN, emodin.

RUTIN

1. Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials

emodin

1. Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials

Activities

Rumex japonicus has 1 reported activities identified across 0 scientific publications and several other databases. The most consistently reported activities include Antiapoptotic.

Antiapoptotic

1. Evidence-based complementary and alternative medicine : eCAM

Medicinal Uses

Rumex japonicus has 2 reported medicinal uses identified across 0 scientific publications and several other databases. The most consistently reported uses include atopic dermatitis, skin disease.

Most Reported Uses