Citrus hystrix
What's the taxonomical classification of Citrus hystrix?
Citrus hystrix belongs to the kingdom Plantae and is classified under the phylum Streptophyta. Within the class Equisetopsida and the subclass Magnoliidae, it is organized under the order Sapindales. This plant is a member of the family Rutaceae and is specifically categorized within the genus Citrus, ultimately reaching its scientific designation as the species hystrix.
| Taxonomic Rank | Classification |
|---|---|
| Kingdom | Plantae |
| Phylum | Streptophyta |
| Class | Equisetopsida |
| Subclass | Magnoliidae |
| Order | Sapindales |
| Family | Rutaceae |
| Genus | Citrus |
| Species | hystrix |
What are the morphological characteristics of this plant?
Citrus hystrix has dark green, glossy leaves characterized by a unique double-leaf structure where a smaller leaflet is fused to the base of a larger one, creating a distinctively notched or kidney-shaped appearance. This morphological feature gives the foliage a bi-lobed look that resembles a miniature figure-eight. The tree typically develops a spreading canopy with woody branches and small, serrated margins along the leaf edges. Its flowers are white and fragrant, emerging in small clusters from the axils of the leaves. The fruit, commonly known as kaffir lime, is a small, green, highly irregular sphere with a deeply wrinkled and bumpy rind.
What is the geographical distribution of this plant?
This plant is native to the tropical and subtropical regions of Southeast Asia, including countries such as Indonesia, Malaysia, Thailand, and Vietnam. It thrives in warm, humid climates where rainfall is abundant throughout the year. While its origins are centered in these specific Asian territories, it has been introduced to many other tropical zones worldwide for culinary and medicinal purposes. Cultivation is widespread in many island nations throughout the Indo-Pacific region due to its adaptability to moist soils. Because of its popularity in Southeast Asian cuisine, it can now be found in many botanical gardens and home gardens across the globe.
How is this plant cultivated?
This plant thrives in tropical and subtropical climates with well-draining soil, consistent moisture, and temperatures staying above 10 degrees Celsius.
Growers must ensure the soil is rich in organic matter to support its vigorous growth. Regular watering is essential, though the root system is sensitive to waterlogging and requires excellent drainage to prevent rot. Providing full sun or partial shade helps the plant produce the fragrant, bumpy leaves used in culinary applications.
Because it is a perennial shrub, it may require occasional pruning to maintain a manageable shape and encourage new foliage.
What parts of this plant are used medicinally?
This plant utilizes its blossoms, fruit peel, and leaves for various medicinal applications. The aromatic blossoms are often used in traditional remedies to treat skin ailments and promote relaxation. The thick fruit peel contains essential oils that provide antimicrobial and antioxidant properties. Additionally, the fragrant leaves are frequently employed to relieve digestive discomfort and reduce inflammation. Together, these distinct parts offer a versatile range of therapeutic benefits.
According to a study published by "Medicines (Basel, Switzerland)", the essential oils from Citrus hystrix are extracted from the peels and leaves. The peels of Citrus hystrix contain sabiene (19) as the major component, which accounts for 36.4%-48.5% of the oil. The leaves of Citrus hystrix contain citronellal (20) as a major component at levels of 61.7%-72.5%. Experimental evidence has shown that the Citrus hystrix essential oil possesses antimicrobial and antifeedant activities.
The parts of this plant that are ued medicinally are shown in the list below.
- blossom
- fruit peel
- leaf
What traditional systems uses this plant?
This plant, known as kaffir lime, has been utilized for centuries in various traditional healing systems such as Kem-kem to treat physical ailments and spiritual imbalances. In Southeast Asian cultures, the aromatic leaves and rind are frequently incorporated into medicinal teas and topical applications to soothe digestive issues. Practitioners often employ the plant's intense scent in ritualistic cleansing ceremonies to ward off negative energies. The essential oils extracted from the fruit are also traditionally used in skin treatments to promote healing and hygiene. This deep-rooted history demonstrates the plant's versatile role in both communal wellness and spiritual practices.
According to a study published by "Heliyon", Citrus hystrix DC., known locally as Rimo Mukur, is one of the plants utilized in the Kem-kem traditional medicine practice of the Karo sub-ethnic in North Sumatra, Indonesia. This traditional healing practice involves using medicinal plants that have been passed down through generations from ancestors. The study, conducted from April to July 2023, documents how various citrus species serve as material sources for Kem-kem to treat at least nine health problems. Within the group of eight Citrus species studied, Citrus hystrix DC. is categorized under nine local names included in the Not Evaluated (NE) category.
The hystorical systems that uses this plant are shown in the list below.
- Kem-kem
What are the pharmacological activities of Citrus hystrix?
This plant has antibacterial, antimicrobial, antioxidant, anti-inflammatory, and antimelanogenic pharmacological activities. Its essential oils and bioactive compounds work effectively to inhibit the growth of various pathogenic microorganisms. The presence of polyphenols allows the plant to neutralize free radicals and reduce oxidative stress within biological systems. Furthermore, its chemical constituents can suppress inflammatory responses and regulate melanin production in skin cells. These diverse properties make Citrus hystrix a significant subject for both pharmaceutical and cosmetic research.
According to a study published by "Journal of intercultural ethnopharmacology", the plant Citrus hystrix DC. was one of 10 medicinal plants studied for its antibacterial activity. The research investigated the volatile oil extracts of this plant against 4 standard strains, which included Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, and Acinetobacter baumannii. Additionally, the study examined the activity against 30 clinical isolates of multidrug-resistant Acinetobacter baumannii. Methods used to determine the bactericidal activity of the water distilled medicinal plants included agar diffusion, minimum inhibitory concentration, and minimum bactericidal concentration.
The primary pharmacological activities of this plant are shown in the list below.
- antibacterial
- antimicrobial
- antioxidant
- anti-inflammatory
- antimelanogenic activity
What medicinal compounds this plant contains?
This plant contains medicinal compounds such as citral, citronellal, eucalyptol, eugenol, and sabinene that contribute to its diverse therapeutic properties. Citral and citronellal are primarily responsible for the distinct citrus aroma and provide significant antimicrobial effects. The presence of eucalyptol offers soothing anti-inflammatory and respiratory benefits to the user. Eugenol acts as a potent analgesic and antiseptic agent within the plant's chemical profile. Finally, sabinene adds to the complex essential oil structure by providing additional antioxidant support.
According to a study published by "Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie", the volatile constituents of kaffir lime leaves were analyzed by gas chromatography coupled with mass spectrometer. These constituents mainly consist of eucalyptol, citronellal, and citral. The study investigated a combination extract containing kaffir lime leaves at a 1:2:1 ratio in a water extract form. This extract was administered to rats for 14 days to observe its effects on hepatitis severity and blood lipid profiles.
The primary medicinal compounds of this plant are shown in the list below.
- citral
- citrone lall
- eugenol
- sabinene
- Kaffir lime oil (KLO)
What health conditions is this plant used for?
This plant is used for managing acne vulgaris, gingivitis, hypercholesterolemia, inflammation, and nonalcoholic steatohepatitis. Its bioactive compounds provide potent antioxidant properties that help reduce systemic inflammation throughout the body. The essential oils found in the leaves and fruit are often utilized to combat oral bacteria associated with gingivitis. Furthermore, certain extracts are studied for their ability to regulate lipid levels to address hypercholesterolemia. These medicinal properties also extend to supporting liver health in cases of nonalcoholic steatohepatitis and clearing skin blemishes in acne vulgaris.
According to a study published by "Chemistry & biodiversity", Citrus hystrix is used for the treatment of acne vulgaris, a skin disorder involving sebaceous gland dysfunction, hormonal imbalances, bacterial overgrowth, and inflammation. The plant exhibits anti-inflammatory properties and potential for acne treatment by examining its effect on P. acnes and inflammatory targets. The hexane extract (34.12% ± 2.56%) and essential oil (43.65% ± 8.44%) showed greater 5α-reductase inhibition at 100 mg/mL than the ethanolic extract (15.64% ± 1.66%). Additionally, the ethanolic extract more effectively inhibited the production of IL-1β, nitric oxide, and PGE2. All samples also demonstrated P. acnes growth inhibition, highlighting the plant as a multi-target anti-acne agent.
The main health conditions this plant is used for are shown in the list below.
- acne
- acne vulgaris
- gingivitis
- inflammation
- inflammatory processes
What are the herbal preparations of this plant?
This plant is Citrus hystrix, a species used to create medicinal herbal preparations including essential oil, ethanolic extract, and mouthwash. The essential oil is frequently extracted from the leaves or rind to utilize its potent antimicrobial and aromatic properties. Researchers also develop ethanolic extracts to concentrate bioactive compounds for potential therapeutic applications in various health treatments. Additionally, the plant is processed into a mouthwash to provide antibacterial effects within the oral cavity. These diverse preparations demonstrate the versatile pharmacological utility of the kaffir lime in traditional and modern medicine.
According to a study published by "Microbial pathogenesis", Kaffir lime oil (KLO) at 500 ppm showed potential activity against X. oryzae pv. oryzae. Its major constituent, citronellal (CIT) at a 75 μM concentration, was found to significantly inhibit biofilm along with swimming and swarming potential. Citronellal treatment led to the downregulation of several transcript levels including motA, cheD, cheY, flgF, gumC, xylanase, endogluconase, cellulose, cellobiosidase, virulence, and rpfF. An insignificant effect of 75 μM CIT treatment was observed on the expression of motB, flgE, pilA, estY, pglA, protease, and lytic genes. In a virulence leaf clip test, lesion length was significantly decreased by 39% in CIT treatment compared to the control leaves.
The main herbal preparations of this plant are shown in the list below.
- essential oil
- ethanolic extract
- mouthwash
What side effects this plant can have?
This plant can cause serious health complications including acetylcholinesterase inhibition and the development of preneoplastic liver cell foci. The inhibition of acetylcholinesterase leads to an accumulation of acetylcholine, which can disrupt normal nervous system function and cause cholinergic toxicity. Furthermore, certain components within the plant are associated with the formation of preneoplastic liver cell foci, indicating a potential risk for hepatic tumor development. These physiological disruptions suggest that high concentrations or specific extracts of Citrus hystrix may pose significant risks to human organ systems. Regular exposure to these bioactive compounds could lead to lasting neurological or metabolic damage.
According to a study published by "Journal of food and drug analysis", Citrus hystrix significantly inhibits acetylcholinesterase at 2.476 ± 0.13 μg/mL. This plant also inhibited collagenase with a 50% inhibitory concentration of 28.71 ± 0.16 μg/mL compared to a control of 24.45 ± 0.19 μg/mL. In the elastase assay, the percentage inhibition of Citrus hystrix was 63.21% compared to a positive control of 75.09%. Furthermore, it was found to significantly inhibit α-glucosidase at 276.70 ± 0.73 μg/mL. Regarding melanin production in B16F10 mouse melanocytes, Citrus hystrix showed an intracellular 50% inhibitory concentration of 15.92 ± 1.06 μg/mL and extracellular inhibition of < 15.625 μg/mL.
The main side effects this plant can have are shown in the list below.
- acetylcholinesterase inhibition
- preneoplastic liver cell focus development
What herbs are paired with Citrus hystrix?
This plant pairs most effectively with lemongrass, galangal, ginger, and holy basil to create complex aromatic profiles.
The intense, high-toned lime scent of the kaffir lime leaves acts as a bright foundation for these earthy and pungent companions. Lemongrass and galangal mirror its citrusy notes, while ginger provides a warming spice that balances the acidity. Using holy basil adds a peppery, anise-like depth that rounds out the sharp botanical edges.
These combinations are foundational in Southeast Asian culinary traditions to build layered flavor profiles.