Chinese rhubarb

Names and Synonyms

Common Names

• Chinese rhubarb
• Turkey rhubarb

Scientific Names

Accepted name

Synonyms

• Rheum palmatum var. tanguticum
• Rheum palmatum subsp. tanguticum

Regional and Traditional Names

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae and is classified under the phylum Streptophyta and class Equisetopsida. Within the subclass Magnoliidae and order Caryophyllales, it is a member of the family Polygonaceae. Finally, it is categorized under the genus Rheum.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant is primarily found within the diverse landscapes of East Asia. Specifically, its natural habitat spans across several significant regions in China, including North-Central China. It also grows in the high-altitude terrains of Qinghai and Tibet. Interestingly, the species exhibits a much wider range than most, with occurrences recorded in Middle Europe, specifically in Austria. Consequently, its geographical distribution reflects a unique presence in both Asian and European territories.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Rheum tanguticum is defined by its specialization within high-altitude alpine environments, where it occupies specific niches dictated by topographical gradients. This species thrives within a distinct elevational range, typically found at altitudes starting from a minimum of 1600 m AMSL. Its distribution extends upward through montane and subalpine zones, reaching a maximum elevation of 3000 m AMSL. On average, the plant establishes itself at a mean elevation of 2300 m AMSL, a positioning that exposes it to the unique climatic stressors, such as intense solar radiation and fluctuating temperatures, characteristic of these high-elevation habitats.

Elevational range max:

3000 m AMSL

Elevational range mean:

2300 m AMSL

Elevational range min:

1600 m AMSL

Life history

The life history of Rheum tanguticum is characterized by its status as a perennial species, allowing it to establish a robust presence within its high-altitude habitats over multiple growing seasons. As a perennial, the plant does not complete its life cycle in a single season but instead invests energy into developing a substantial, starch-rich rhizome that serves as a vital storage organ for surviving harsh alpine winters. This underground structure enables the plant to persist through dormancy periods, providing the necessary nutrients to trigger regrowth once favorable environmental conditions return each spring. The developmental trajectory involves a period of vegetative growth where the plant focuses on expanding its leaf rosette and strengthening its root system, followed by a reproductive phase where it produces inflorescences to facilitate sexual reproduction via seeds. Because it is perennial, the plant can undergo repeated cycles of flowering and seeding, contributing to its long-term survival and ability to colonize stable mountain environments.

Lifecycle :

perennial

Morphology

The morphology of Rheum tanguticum is characterized by its growth form as a non-woody herb. It is a self-supporting plant that does not function as a climber or a liana, maintaining a sturdy, independent structure. As a terrestrial species, it is neither aquatic nor an epiphyte, growing independently in its environment without parasitic tendencies. The plant's stature is variable, with a height ranging from a minimum of 0.5 m to a maximum of 2 m, maintaining an average plant height of approximately 1.25 m.

Aquatic :

terrestrial

Climber :

self-supporting

Epiphyte :

terrestrial

Growth form :

herb

Parasite :

independent

Plant height max:

2 m

Plant height mean:

1.25 m

Plant height min:

0.5 m

Woodiness :

non-woody

Physiology

The physiology of Rheum tanguticum is characterized by distinct vegetative development patterns, particularly regarding its foliar architecture and photosynthetic capacity. The plant exhibits significant morphological variability in its leaf dimensions, which plays a crucial role in its ability to capture solar energy within its native high-altitude habitats. On average, the leaves maintain a mean length of 45 cm, though the physiological range of development is quite broad. Individual specimens may produce smaller leaves with a minimum length of 30 cm, while under optimal environmental conditions, the leaves can reach a maximum length of 60 cm. This variation in leaf length suggests a flexible physiological response to local microclimates and resource availability, allowing the plant to optimize its surface area for gas exchange and transpiration.

Leaf length max:

60 cm

Leaf length mean:

45 cm

Leaf length min:

30 cm

Reproduction

The reproduction of Rheum tanguticum culminates in the development of specialized fruit structures that exhibit specific morphological dimensions. The resulting fruits are characterized by a relatively consistent size range, with the fruit length typically measuring a minimum of 0.8 cm and reaching a maximum of 0.95 cm, resulting in a documented mean length of 0.875 cm. In terms of lateral dimensions, the fruit width varies from a minimum of 0.7 cm to a maximum of 0.75 cm, with an average width of 0.725 cm observed across specimens. These precise measurements in length and width define the physical parameters of the reproductive output of the species.

Fruit length max:

0.95 cm

Fruit length mean:

0.875 cm

Fruit length min:

0.8 cm

Fruit width max:

0.75 cm

Fruit width mean:

0.725 cm

Fruit width min:

0.7 cm

Sources: Global Inventory of Floras and Traits (GIFT)

Plant Parts

Rheum tanguticum has 3 reported plant parts identified across 8 scientific publications and several other databases that are studied for medicinal purposes. The most consistently reported plant part include root, seed, leaf.

Root

1. Plant biotechnology journal
2. BMC plant biology
3. Metabolomics : Official journal of the Metabolomic Society
4. Journal of ethnopharmacology
5. Planta medica

Seed

1. Plant biotechnology journal
2. BMC complementary medicine and therapies

Leaf

1. Plant biotechnology journal

Chemicals

Rheum tanguticum has 15 reported phytochemicals identified across 8 scientific publications and several other databases. The most consistently reported chemicals include Chrysophanol, emodin, Aloe emodin, Anthraquinones, Flavonoids.

Chrysophanol

1. Yao xue xue bao = Acta pharmaceutica Sinica
2. BMC plant biology
3. Chemistry & biodiversity
4. BMC complementary medicine and therapies

emodin

1. Yao xue xue bao = Acta pharmaceutica Sinica
2. BMC plant biology
3. Plant biotechnology journal
4. Journal of ethnopharmacology

Aloe emodin

1. Yao xue xue bao = Acta pharmaceutica Sinica
2. BMC plant biology
3. Plant biotechnology journal

Anthraquinones

1. Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica
2. Frontiers in plant science

Flavonoids

1. Plant biotechnology journal
2. BMC plant biology

Physcion

1. Yao xue xue bao = Acta pharmaceutica Sinica
2. BMC plant biology

Sennoside A

1. BMC plant biology
2. Chemistry & biodiversity

Sennoside B

1. BMC plant biology
2. Chemistry & biodiversity

3-Methyl-1,6,8-trihydroxyanthraquinone

1. Journal of ethnopharmacology

AQS

1. Plant biotechnology journal

Activities

Rheum tanguticum has 3 reported activities identified across 8 scientific publications and several other databases. The most consistently reported activities include Hepatoprotective, Neuroprotective, Purgative.

Hepatoprotective

1. Plant biotechnology journal

Neuroprotective

1. BioFactors (Oxford, England)

Purgative

1. Plant biotechnology journal

Medicinal Uses

Rheum tanguticum has 7 reported medicinal uses identified across 8 scientific publications and several other databases. The most consistently reported uses include HIV, allergy, anti-oxidant, cardiovascular disease, constipation.

Most Reported Uses

Preparations