Jewelweed

Jewelweed (Impatiens capensis): A Comprehensive Reference

1. Identity and Botanical Overview

Nomenclature and Taxonomy

Jewelweed, known botanically as Impatiens capensis, is commonly called orange jewelweed, common jewelweed, spotted jewelweed, spotted touch-me-not, or orange balsam, and is an annual plant in the family Balsaminaceae that is native to North America. A closely related species, Impatiens pallida (yellow jewelweed), is similar but has larger yellow flowers with a shorter nectar spur and is less common.

While the genus name Impatiens was an apt choice (made by the father of taxonomy himself, Linnaeus), the epithet capensis is a misnomer. Capensis means "from the cape," referring to the Cape of Good Hope in South Africa; the Dutch botanist Nicolaas Meerburgh mistakenly thought the species originated there when he bestowed the name in 1775.

The genus name comes from the Latin word impatiens meaning "impatient," in reference to the violent seed discharge from the ripe pods. The fruit capsules of Impatiens spp. dramatically explode along their seams at the slightest touch, propelling the seeds up to six feet away from the mother plant; the seeds are also buoyant, allowing them to travel even longer distances by water.

The leaves appear to be silver or "jeweled" when held underwater, which is possibly where the jewelweed name comes from. Another possible source of the name is the color and shape of the bright robin's egg-blue kernels of the green projectile seeds.

Common Names and Synonyms

Spotted or orange jewelweed is also known as touch-me-not, spotted touch-me-not, orange balsam, ear jewel, kicking colt, ladies earring, and silverleaf. It has also been recorded historically under the synonym Impatiens biflora, under which name some older clinical literature references it.

Morphology and Habitat

Jewelweed is a herbaceous plant that grows 0.9–1.5 m (3–5 ft) tall and often branches extensively. The round stems are glabrous (smooth) and succulent, and semi-translucent, with swollen or darkened nodes on some plants. The leaves, which measure up to 13 cm (5 in) long and 6 cm (2½ in) across, are alternate on the upper stems and opposite on the lower stems.

It is common and widespread in moist, shady areas such as low woodlands, margins of bogs and marshes, along streams and lakes, in ditches, and in disturbed areas such as road cuts. Its native distribution extends from Saskatchewan to Newfoundland, south to Georgia, west to Oklahoma, and north to Missouri.

Impatiens capensis was transported in the 19th and 20th centuries to England, France, the Netherlands, Poland, Sweden, Finland, and potentially other areas of northern and central Europe, where these naturalized populations persist.

Plant Parts Used

The principal parts used medicinally are the aerial portions of the plant — most importantly the stems and leaves, from which juice and mash are derived. When applied topically, sap from the stem and leaves is said to relieve itching and pain from a variety of ailments, including hives, poison ivy, stinging nettle, and other skin sores and irritations. Jewelweed flowers contain kaempferol, quercetin, and lawsone, and other aerial parts contain phenolics, flavonols, anthocyanins, quinones, saponins, and impatienol.

Common Preparations and Dosage Forms

Approaches, formulations, and preparations have varied, including glycerin or aqueous extracts, whole-plant mashes, juice from aerial parts, sprays, soaps, and creams. Herbalists traditionally prepare the plant as a poultice by crushing the fresh stems and leaves and applying directly to skin, or by boiling plant material to create a decoction or wash. Crushed jewelweed has been used as a topical salve for poison ivy; however, no specific dose has been determined in clinical trials.

2. Traditional and Historical Use

Native American Traditions

Jewelweed has a long history of use in Native American medicine. Many Native American tribes used I. capensis and its close relatives to treat and prevent rash from plant sources, particularly Toxicodendron radicans (poison ivy) and Urtica dioica (stinging nettle).

Historically, I. capensis was used to treat hives and rashes caused by other plants and to prevent poison ivy rash by rubbing it on the skin prior to known exposure or immediately after coming into contact with poison ivy. The Southern Cherokee used I. capensis to treat poison ivy rash and itch, insect bites, plant stings, and hives.

The Potawatomi used a fresh juice of I. capensis to treat nettle stings or poison ivy rash, and it was similarly used by the Chippewa, Meskwaki, and Omaha, who called it "zhi hin nonxe thionbaba," which means "plant like shiny glass."

The sap of jewelweed has been used by American Indians, particularly those living in Appalachia, as a prophylactic against poison ivy rash and as a treatment after eruptions have occurred. The Southern Cherokee, Potawatomi, Chippewa, Meskwaki, and Omaha used I. capensis for various forms of pruritic dermatitis, including the treatment and prevention of poison ivy rash and itch, stings from other plants such as stinging nettle, and insect bites.

Multiple Indigenous groups throughout its range used the plant's succulent stems and leaves to create poultices and washes for treating rashes, burns, cuts, and insect stings. The Potawatomi, Cherokee, and other nations had sophisticated methods for preparing and applying jewelweed remedies. This traditional use was quickly adopted by European colonists.

Use in Other Cultures

Chinese herbal medicine uses the aerial parts of related Impatiens species to treat pain and swelling, and as an antimicrobial agent. In Japan, the juice of Impatiens spp. flowers is used to stop itching. The related garden balsam, I. balsamina, a native of China, was used by the indigenous people of Asia for similar dermatological purposes.

Jewelweed was first used by Native Americans thousands of years ago to treat various medical conditions. When pioneers saw the plant being cultivated and valued for its health benefits, they too began to use it in the same way.

Traditional Preparation Methods

The most well-known historical use of jewelweed is as a remedy for skin irritations, particularly poison ivy, poison oak, and insect bites. The plant's juicy stems and leaves were crushed to create poultices or infusions, which were then applied directly to the affected area to alleviate itching, inflammation, and discomfort. The fresh juice of the stems is perhaps the most direct and historically attested preparation, used immediately upon contact with irritating plants.

3. Key Constituents and Active Compounds

Naphthoquinones

The principal active components in Impatiens sp. are the dinaphthofuran-7,12-dione derivatives, lawsone and lawsone methyl ether. These chemical constituents provide predominant anti-microbial, anti-anaphylaxis, and anti-allergic activities. Lawsone, lawsone methyl ether, and methylene-3,3'-bilawsone, described as an anti-pruritic agent, are each isolated from the leaves and roots of Impatiens sp.

Lawsone has many pharmacological effects including anti-inflammatory, antioxidant, antibacterial, antifungal, and anticancer properties. Traditionally, it was used in the treatment of dermatological infections including eczema, psoriasis, and fungal infections.

Flavonoids

Jewelweed flowers contain kaempferol, quercetin, and lawsone, and other aerial parts contain phenolics, flavonols, anthocyanins, quinones, saponins, and impatienol. Specific flavonoids identified through phytochemical analysis include dihydromyricetin (ampelopsin), eriodictyol-7-O-glucoside, kaempferol-3-O-glucoside (astragalin), kaempferol-3-O-6"-malonyl-glucoside, kaempferol-3-O-rhamno-rhamnosyldiglucoside, quercetin-3-O-galactoside (hyperoside), quercetin, and kaempferol.

Saponins

Jewelweed is efficacious in preventing the development of dermatitis following poison ivy contact; lawsone content does not correlate with poison ivy rash prevention. Perhaps saponins, the soapy component of jewelweed, are the effective agents. Saponins may act mechanically to remove or bind the urushiol resin responsible for poison ivy dermatitis, though this mechanism has not been conclusively demonstrated in clinical research.

Antimicrobial Peptides

Ib-AMP4 is a peptide isolated from Impatiens sp. Jewelweed extract, specifically the pod extract and its constituents, have been shown to be effective antimicrobial agents. Ib-AMP4 has shown effectiveness against MRSA and extended-spectrum β-lactamase-producing Escherichia coli and could be applicable in the treatment of septicemia. These findings, however, are from preclinical laboratory studies and have not yet been validated in human clinical trials.

Additional Compounds

Other active compounds possessing anti-dermatitis, anti-bacterial, anti-pruritic, and anti-histaminic properties include peptides, quinones, flavonoids, phenolic acids, and coumarins found in the seeds, roots, and flowers of Impatiens sp. Seeds also contain β-sitosterol, a new anthraquinone, and palmitic acid, stearic acid, and oleic acids as well as their ethyl esters.

4. Scientific Evidence by Area of Use

4.1 Poison Ivy / Urushiol-Induced Contact Dermatitis

This is the most extensively studied application of jewelweed. The overall picture from clinical research is mixed, with the preparation type proving critically important to outcomes.

Positive findings: A study published in the Journal of Ethnopharmacology (2012) aimed to validate the ethnopharmacological use of jewelweed in poison ivy dermatitis prevention. Poison ivy was brushed onto the forearms of volunteers in six locations, and exposed areas were treated with jewelweed extracts, fresh plant mashes, soaps made of plant extracts, water, and Dawn® dish soap. Jewelweed mash was effective in reducing poison ivy dermatitis, supporting ethnobotanical use. However, jewelweed extracts were not effective; and soaps made of these extracts were effective but no more so than jewelweed-free soaps.

Negative findings: A pilot study published in the American Journal of Contact Dermatitis (1997) noted that jewelweed has been used for centuries for the treatment of poison ivy/oak allergic contact dermatitis, and numerous claims for its effectiveness exist in the lay press, but few scientific studies had been performed. This study was a randomized, double-blinded, paired comparison investigation testing the efficacy of a jewelweed extract in treatment of experimentally induced allergic contact dermatitis. This study concluded that an extract of jewelweed was not effective in the treatment of poison ivy/oak allergic contact dermatitis.

Despite being used both traditionally and in modern times for the treatment of poison ivy and poison oak exposure, Impatiens sp. has not been found to be convincingly successful when used in the treatment of urushiol-induced contact dermatitis. In one clinical study, ten adult volunteers were subjected to urushiol on a site on their forearm; after nine days of treatment with distilled water or jewelweed, there was no statistically significant improvement at the sites treated by jewelweed versus the distilled water control sites.

Contextual factors: It is possible that the time frame is the culprit in the failure of jewelweed to prevent poison ivy rash in many studies. One earlier study applied poison ivy to the test site for a full 15 minutes prior to treating with jewelweed extract, an experimental exposure time far exceeding normal contact time, which possibly resulted in urushiol binding that could not be counteracted by delayed jewelweed treatment. Lawsone content varied with harvest season and did not appear to affect rash development.

Summary of evidence strength: Evidence is preliminary and conflicting. The fresh mash of the whole plant has shown some benefit in one controlled study, while processed extracts have generally failed to demonstrate efficacy. The mechanism of benefit from the mash, if genuine, likely relates to saponins rather than lawsone. All existing studies involve small sample sizes and significant methodological heterogeneity. No large, well-controlled randomized controlled trials (RCTs) currently exist.

4.2 Antipruritic (Anti-Itch) Activity

A study using an ethanol extract of the white petals of I. balsamina suggested two different compounds possibly responsible for the antipruritic activity demonstrated in mice. A small clinical trial suggested an aqueous extract of jewelweed stem was ineffective in reducing the erythema, vesicles, and edema associated with poison ivy, but the subjects did report decreased pruritus.

Evidence strength: Weak. Antipruritic effects have been observed in murine (animal) models and in very limited human data. Human clinical evidence is insufficient to draw firm conclusions.

4.3 Antifungal Activity

The three naphthoquinone compounds — lawsone, lawsone methyl ether, and methylene-3,3'-bilawsone — from Impatiens balsamina leaf extracts were tested for their ability to inhibit the growth of dermatophyte fungi, yeast, aerobic bacteria, facultative anaerobic bacteria, and anaerobic bacteria. Lawsone methyl ether showed the highest antibacterial activity and some antifungal activity against dermatophyte fungi and Candida albicans.

The sap has also been shown to have anti-fungal properties and can be used to treat athlete's foot, according to the United States Forest Service. The jewelweeds have a mucilaginous sap that is supposed to soothe skin irritation caused by poison ivy and stinging nettle; this sap also has fungicidal properties and has been used to treat athlete's foot.

Evidence strength: Preclinical only. Available evidence comes from in vitro (laboratory) studies. No human clinical trials have specifically tested jewelweed for athlete's foot or other fungal infections.

4.4 Antimicrobial Activity

Jewelweed extract, specifically the pod extract, and its constituents have been shown to be effective antimicrobial agents. Ib-AMP4 has shown effectiveness against MRSA and extended-spectrum β-lactamase-producing Escherichia coli and could be applicable in the treatment of septicemia.

Ib-AMP4 is a plant defense antimicrobial peptide with a net charge of +6, derived from Impatiens balsamina seeds, with cysteine residues forming two intermolecular disulfide bonds that increase its stability in liquid substrate.

Evidence strength: Preclinical only. All antimicrobial data come from in vitro and in vivo animal studies. Ib-AMP4 is particularly well characterized at the laboratory level but has not progressed to human clinical investigation for these applications as yet.

4.5 Anti-Inflammatory Activity

Some laboratory studies have identified compounds such as lawsone and flavonoids within the plant, which exhibit potential anti-inflammatory and antioxidant properties. Lawsone has many pharmacological effects including anti-inflammatory and antioxidant properties.

Evidence strength: Primarily in vitro and animal-model data. Human clinical evidence for isolated anti-inflammatory use is lacking.

4.6 Anticancer Properties

Lawsone, lawsone methyl ether, and methylene-3,3'-bilawsone have been shown to exhibit cytotoxicity in cancer cell lines A549, Bel-7402, and HeLa. Researchers have concluded that lawsone can reduce cell proliferation in colon cancers, with the suppressive activity mediated not by apoptosis but rather via a reduction in NF-kB (nuclear factor kappa light chain enhancer of activated B cells) activity.

Evidence strength: Preliminary in vitro evidence only. No human trials have evaluated jewelweed or its isolated compounds for anticancer applications. These results cannot be extrapolated to clinical use.

5. Body Systems and Health Areas

• Integumentary System (Skin): The primary and most extensively documented area of use. Applications include relief from urushiol-induced contact dermatitis (poison ivy/oak), stinging nettle stings, insect bites, hives, and general skin rashes. Historically, Native American communities used jewelweed topically to alleviate skin irritations, especially those caused by poison ivy, insect bites, and minor burns.
• Dermatological / Fungal: Jewelweed has a historical use by Native Americans as an antidote for hives and a treatment for athlete's foot. In vitro antifungal activity has been identified in naphthoquinone constituents.
• Antimicrobial: The antimicrobial peptide Ib-AMP4, identified in the related species I. balsamina, has shown laboratory-level activity against drug-resistant organisms including MRSA. This reflects a preclinical area of active research interest.
• Immune / Allergic Response: The principal active components provide predominant anti-microbial, anti-anaphylaxis, and anti-allergic activities in preclinical studies.
• Oncology (preclinical): In vitro evidence for cytotoxicity against multiple cancer cell lines via lawsone and its derivatives, without clinical data.

6. Dosage Forms and Reported Dosages

No standardized pharmaceutical dosage has been established for any preparation of jewelweed. The following dosage forms and approaches have been used in either traditional contexts or clinical/laboratory research:

• Fresh plant mash (topical): In the Motz et al. (2012) clinical study, poison ivy was brushed onto the forearms of volunteers in six locations, and exposed areas were treated with jewelweed extracts, fresh plant mashes, soaps made of plant extracts, water, and Dawn® dish soap. No standardized weight or amount of mash was reported as a clinical dosage recommendation.
• Aqueous extract (topical): A small clinical trial assessed an aqueous extract of jewelweed stem; the formulation was applied topically but the results demonstrated it was ineffective in reducing erythema, vesicles, and edema associated with poison ivy.
• Crushed stem juice / succus: Applied directly to the affected skin surface using the fresh, crushed aerial parts of the plant. This is the most traditional form of application.
• Soaps and topical cleansers: Soaps made from jewelweed extracts were effective in reducing poison ivy-associated dermatitis, but no more effective than jewelweed-free soaps.
• Internal use (traditional): Use of Impatiens spp. tea has been reported to cause digestive upset, while consumption of the whole plant induces vomiting and diuresis. No internally administered dosage has been established through clinical research.

No specific clinical dose has been determined in clinical trials for any topical or oral application.

7. Safety Considerations

Oxalic Acid Content

Young leaves and shoots, when eaten, contain calcium oxalate crystals; calcium oxalate is usually destroyed by thorough cooking. Large quantities of the leaves are purgative. Jewelweed leaves and stems are high in oxalic acid; for this reason, young leaves and shoots are typically cooked to remove some of the oxalic acid.

People prone to developing calcium oxalate kidney stones should avoid eating plants high in oxalates like jewelweed, even when cooked.

Pregnancy and Lactation

Information regarding safety and efficacy in pregnancy and lactation is lacking. Traditional use as an emmenagogue suggests the need for caution.

Topical Sensitivity

The effectiveness of jewelweed use to prevent the development of a rash after short-term exposure to poison ivy has been supported by peer-reviewed study, and is likely due to the plant containing saponins. These studies also found that some individuals have a sensitivity to jewelweed which can cause a more severe rash.

Oral/Internal Use

Use of Impatiens spp. tea has been reported to cause digestive upset, while consumption of the whole plant induces vomiting and diuresis.

General Safety Observations from Research

Of all the studies reviewed in one systematic overview, no negative side effects of the use of jewelweed extract and its constituents were reported; however, further clinical studies would likely be necessary to confirm this. The absence of reported adverse events in small studies should not be taken as evidence of safety at unstudied doses or in unstudied populations.

Drug Interactions

No drug interactions are well documented for jewelweed in the peer-reviewed clinical literature. This reflects a paucity of formal pharmacokinetic and interaction studies rather than established safety.

8. Relationship to Related Species

The closely related garden balsam, Impatiens balsamina, is also a self-seeding annual, native to China and India, which grows to a height of 2.5 ft and produces pink to purple axillary flowers on short pedicels. The related I. balsamina was used by the indigenous people of Asia for similar dermatological purposes. Much of the in vitro pharmacological research on naphthoquinone constituents (particularly lawsone, lawsone methyl ether, and Ib-AMP4) has been conducted using I. balsamina rather than I. capensis; findings from I. balsamina are often discussed in the context of the broader Impatiens genus but may not be directly applicable to I. capensis without species-specific confirmation.

9. Evidence Summary

Jewelweed (Impatiens capensis) carries a rich documented history of topical ethnomedicinal use among multiple Native American nations and subsequently among European colonists for skin conditions, especially those associated with contact with urushiol-producing plants. Extensive ethnobotanical evidence supports the efficacy of jewelweed in preventing urushiol-induced dermatitis as a result of contact with poison ivy. However, the clinical trial record is small, methodologically heterogeneous, and produces conflicting conclusions. Fresh plant mash has shown some efficacy in preventing poison ivy rash in one controlled study; processed extracts have failed to do so. Antifungal, antimicrobial, and anticancer activities have been identified in preclinical research but have not been tested in human populations. Overall, the scientific evidence base for jewelweed remains preliminary and insufficient to establish any dosage, indication, or safety profile by regulatory or clinical standards.

References

• Abrams Motz V, Bowers CP, Mull Young L, Kinder DH. "The effectiveness of jewelweed, Impatiens capensis, the related cultivar I. balsamina and the component, lawsone in preventing post poison ivy exposure contact dermatitis." Journal of Ethnopharmacology, 2012. ScienceDirect.
• Long D, Ballentine NH, Marks JG Jr. "Treatment of poison ivy/oak allergic contact dermatitis with an extract of jewelweed." American Journal of Contact Dermatitis, 1997. PubMed PMID: 9249283.
• Zink BJ et al. "The effect of jewel weed in preventing poison ivy dermatitis." Journal of Wilderness Medicine, 1991. SAGE Journals.
• Klemow KM et al. "Medical attributes of Impatiens sp. — Jewelweed." Wilkes University, Herbal Medicine: Biomolecular and Clinical Aspects.
• Lawsone Unleashed: A Comprehensive Review on Chemistry, Biosynthesis, and Therapeutic Potentials. PMC / NCBI.
• Ib-AMP4 antimicrobial peptide as a treatment for skin and systematic infection of methicillin-resistant Staphylococcus aureus (MRSA). PMC / NCBI.
• Shah et al. "A phyto-pharmacological overview on Jewel Weed." Journal of Applied Pharmaceutical Science, 2017.
• Drugs.com Natural Products Database: "Jewelweed Uses, Benefits & Dosage."
• Wikipedia: Impatiens capensis.
• United States Forest Service — Celebrating Wildflowers: "Jewelweed (Impatiens capensis)."
• University of Wisconsin–Extension Horticulture: "Jewelweed, Impatiens capensis."
• Native Plant Trust — Go Botany: "Impatiens capensis (Jewelweed, Spotted Touch-Me-Not)."
• Lady Bird Johnson Wildflower Center — Native Plants of North America: "Impatiens capensis (Jewelweed)."
• Morris Arboretum & Gardens: "Plant Name Blooper: Impatiens capensis (Jewelweed)."
• "The Application of Impatiens balsamina L. and Its Advances." Biointerface Research in Applied Chemistry, 2024.
• Science.gov — Topic Pages: "Jewelweed Impatiens capensis."