Indian soapberry

Names and Synonyms

Common Names

• North Indian Soapnut
• Washing nuts
• washing-nuts
• Indian soapberry

Scientific Names

Accepted name

Synonyms

• Sapindus mukorossi var. carinatus
• Sapindus indicus
• Sapindus abruptus
• Sapindus utilis
• Sapindus boninensis

Regional and Traditional Names

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae and the phylum Streptophyta, falling under the class Equisetopsida and subclass Magnoliidae. It is further classified within the order Sapindales and the family Sapindaceae. Finally, its taxonomic identity is established within the genus Sapindus.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant exhibits a broad geographical range across several key regions of East Asia. In China, it is widely distributed throughout the south-central provinces and the southeast coastal areas. Its presence is also noted on the tropical island of Hainan. Moving further north and east, the species can be found naturally occurring in Japan. Finally, its distribution extends into the Korean Peninsula, completing its regional footprint.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Sapindus mukorossi is characterized by its adaptability to diverse tropical and subtropical environments, typically thriving in deciduous forests, riverine thickets, and scrublands. It prefers well-drained soils and can tolerate varying degrees of moisture, often colonizing disturbed areas or forest edges where sunlight is more abundant. The species exhibits a broad altitudinal distribution, commonly found in lowland regions but capable of ascending to significant heights, with an elevational range reaching a maximum of 1500 m AMSL. Its ability to persist in seasonally dry climates makes it a resilient component of its native ecosystems, where it plays a role in soil stabilization and providing habitat for local fauna.

Elevational range max:

1500 m AMSL

Life history

The life history of Sapindus mukorossi is characterized by its nature as a perennial species, allowing it to persist in its environment through multiple growing seasons. Throughout its developmental stages, the plant exhibits a deciduous habit, shedding its foliage periodically, typically in response to seasonal changes or dry periods. This life cycle enables the plant to endure varying climatic conditions while maintaining long-term structural presence in its natural habitat.

Deciduousness :

deciduous

Lifecycle :

perennial

Morphology

The morphology of Sapindus mukorossi is characterized by its growth form as a robust, woody tree that typically reaches a significant plant height with a mean of approximately 20 m. As a terrestrial species, it does not exhibit aquatic or semiaquatic tendencies, nor does it function as an epiphyte, maintaining an independent existence rather than a parasitic one. The plant is structurally self-supporting, lacking the characteristics of a climber, liana, or vine, and possesses a distinctively woody constitution.

Aquatic :

terrestrial

Climber :

self-supporting

Epiphyte :

terrestrial

Growth form :

tree

Parasite :

independent

Plant height mean:

20 m

Woodiness :

woody

Physiology

The physiology of Sapindus mukorossi is characterized by a C3 photosynthetic pathway, which dictates its carbon fixation processes and metabolic efficiency under standard environmental conditions. The plant exhibits a moderate structural density, with a mean stem specific density (SSD) of 651 mg/cm³, reflecting its wood properties and internal cellular architecture. Additionally, regarding its nutrient acquisition and symbiotic relationships, Sapindus mukorossi is not a nitrogen fixer, meaning it relies on the uptake of available nitrogen from the soil rather than through atmospheric nitrogen fixation via specialized root nodules.

Nitrogen fixer :

no

Photosynthetic pathway :

C3

Stem specific density (SSD) mean:

651 mg/cm³

Reproduction

The reproduction of Sapindus mukorossi is characterized by a complex biological process involving specific seasonal timing and biotic interactions. The flowering period for this species is quite extensive and variable, typically beginning in April and continuing through until September. The pollination process is strictly biotic, relying on animal vectors rather than abiotic factors like wind or water; specifically, the plant utilizes an insect-based pollination syndrome, with bees playing a significant role in the transfer of pollen. Following successful fertilization, the plant produces seeds with notable variations in size. The seed mass is highly variable, with a minimum recorded mass of 0.321 g and a maximum reaching up to 1.7519 g, resulting in an average seed mass of approximately 0.88653 g.

Flowering time :

Apr

Flowering time :

Sep

Pollination syndrome :

insect

Pollination syndrome :

bee

Pollination syndrome :

biotic

Seed mass max:

1.7519 g

Seed mass mean:

0.88653 g

Seed mass min:

0.321 g

Sources: Global Inventory of Floras and Traits (GIFT)

Plant Parts

Sapindus mukorossi has 1 reported plant parts identified across 1 scientific publications and several other databases that are studied for medicinal purposes. The most consistently reported plant part include seed.

Seed

1. Preparative biochemistry & biotechnology

Chemicals

Sapindus mukorossi has 7 reported phytochemicals identified across 1 scientific publications and several other databases. The most consistently reported chemicals include Abscisic acid (ABA), Furamizole, alpha-Tocopherol quinone, luteolin, oleic acid.

Abscisic acid (ABA)

1. Genomics

Furamizole

1. Scientific reports

alpha-Tocopherol quinone

1. Scientific reports

luteolin

1. Scientific reports

oleic acid

1. Microbiological research

sucrose

1. Scientific reports

troxipide

1. Scientific reports

Activities

Sapindus mukorossi has 3 reported activities identified across 1 scientific publications and several other databases. The most consistently reported activities include Contraceptive, Emetic, Hepatoprotective.

Contraceptive

1. Revista do Instituto de Medicina Tropical de Sao Paulo

Emetic

1. Revista do Instituto de Medicina Tropical de Sao Paulo

Hepatoprotective

1. Revista do Instituto de Medicina Tropical de Sao Paulo

Conditions

Sapindus mukorossi has 3 reported investigations on conditions identified across 1 scientific publications and several other databases. The most consistently reported conditions include contraceptive, dandruff, liver diseases.

Contraceptive

1. Revista do Instituto de Medicina Tropical de Sao Paulo

Dandruff

1. Journal of ethnobiology and ethnomedicine

Liver diseases

1. Phytotherapy research : PTR

Preparations

Sapindus mukorossi has 7 reported preparations identified across 1 scientific publications and several other databases. The most consistently reported preparations include Defatted sapindus seed kernel, Protein isolate, aqueous Ethanol and ethanol extracts, aqueous ethanol and ethanol extract, defatted kernel.

Defatted sapindus seed kernel

1. Preparative biochemistry & biotechnology

Protein isolate

1. Preparative biochemistry & biotechnology

Aqueous ethanol and ethanol extracts

1. Preparative biochemistry & biotechnology

Aqueous ethanol and ethanol extract

1. Preparative biochemistry & biotechnology

Defatted kernel

1. Preparative biochemistry & biotechnology

Deffated seed

1. Preparative biochemistry & biotechnology

Methanolic extract

1. Microbiological research