Rheum pumilum

Names and Synonyms

Scientific Names

Accepted name

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

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

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant exhibits a specific distribution pattern across various high-altitude regions of East Asia. It is primarily found throughout the South-Central areas of China. Additionally, its range extends into the North-Central provinces of the country. The species is also documented growing within the Qinghai province. Finally, its geographical presence includes the vast plateau regions of Tibet.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Rheum pumilum is defined by its specialized adaptation to high-altitude alpine environments, where it occupies a specific niche within mountainous terrains. This species is characterized by a distinct elevational range, typically thriving in subalpine and alpine zones. Its distribution begins at a minimum elevation of 2800 m AMSL and extends to a maximum altitude of 4500 m AMSL, indicating a high tolerance for the extreme physiological stresses associated with high-mountain ecosystems, such as intense UV radiation, low atmospheric pressure, and fluctuating temperatures. On average, the plant is most prevalent at a mean elevation of 3650 m AMSL, a zone that likely provides the optimal balance of soil moisture, thermal stability, and light availability required for its survival and growth in these rugged habitats.

Elevational range max:

4500 m AMSL

Elevational range mean:

3650 m AMSL

Elevational range min:

2800 m AMSL

Morphology

The morphology of Rheum pumilum is characterized by its diminutive and compact growth habit, typically reaching a mean plant height of 0.175 m. The stature of the plant varies according to environmental conditions, with individual specimens ranging from a minimum height of 0.1 m to a maximum height of 0.25 m. This low-growing architecture is consistent with its specialized ecological niche, maintaining a stunted profile that distinguishes its overall physical form.

Plant height max:

0.25 m

Plant height mean:

0.175 m

Plant height min:

0.1 m

Reproduction

The reproduction of Rheum pumilum is characterized by the development of small, distinct fruits that exhibit specific morphological dimensions. The fruit length shows a narrow range of variation, with a minimum length of 0.5 cm, a mean length of 0.55 cm, and a maximum length reaching 0.6 cm. In terms of fruit width, the dimensions are remarkably consistent, maintaining a minimum, mean, and maximum width of 0.4 cm. These precise measurements define the structural profile of the reproductive output of the species.

Fruit length max:

0.6 cm

Fruit length mean:

0.55 cm

Fruit length min:

0.5 cm

Fruit width max:

0.4 cm

Sources: Global Inventory of Floras and Traits (GIFT)

Chemicals

Rheum pumilum has 6 reported phytochemicals identified across 0 scientific publications and several other databases. The most consistently reported chemicals include ABA, Br-, CK, GA, IAA.

ABA

1. Scientific reports

Br-

1. Scientific reports

CK

1. Scientific reports

GA

1. Scientific reports

IAA

1. Scientific reports

eth

1. Scientific reports