Collinsonia

Collinsonia (Collinsonia canadensis L.): A Comprehensive Reference

1. Identity and Botanical Description

Taxonomic Classification and Nomenclature

Collinsonia canadensis, commonly called richweed or stoneroot, is a species of perennial herb in the mint family (Lamiaceae). Additional common names include Canada Horsebalm, Richweed, Hardhack, Heal-All, Horseweed, Ox-Balm, and Stone Root. The genus name honors its European discoverer: the plant was discovered by Peter Collinson (1693–1768), an enthusiastic English merchant botanist who took great interest in transporting to England and cultivating new American plants.

Natural Distribution and Habitat

It is native to eastern North America, primarily east of the Mississippi River, where it is widespread. It is the most broadly distributed member of the genus Collinsonia, ranging north to Quebec and south to Florida. Its natural habitat is nutrient-rich mesic forests, most often in rocky, calcareous areas.

Morphological Characteristics

Collinsonia canadensis can grow up to 4 feet (1.2 m) tall and has terminal clusters of tiny, tubular yellow flowers. Leaves are green, large, sharply toothed, and ovate. It produces lemon-scented flowers in mid-summer, a time when little else is in bloom in densely shaded forests.

The plant has a stem two to three feet high, somewhat branching above; leaves are three to eight inches long and three to four inches broad, ovate, serrate, and acuminate, with the lower leaves on long petioles and the upper almost or quite sessile. The parts used medicinally are the root and herb. However, it is not the flowers but the root and rhizome of the plant that are considered to hold the primary therapeutic value.

Common Preparations and Dosage Forms

The plant has historically been employed in infusion, tincture, and fluid extract. Although it can be sourced in whole form, fresh or dried, it is commonly purchased ground, encapsulated, or as a tea, tincture, or liquid extract. Classical Eclectic authorities recommended that all preparations should be made from the green (fresh) plant.

The extraction of active constituents from the root presents particular technical challenges. The active principles are very difficult to abstract, whether the drug be finely ground or powdered, its constituents demanding an element of time for their solution, regardless of the menstruum employed. Either the green or the dried root of Collinsonia imparts a deep, red-brown color to any menstruum that finally abstracts its full qualities. This color arises from the fact that its virtues reside largely in the rootlets, the brown epidermis, and the slightly colored subjacent portions, which must not be excluded if the operator expects to obtain the full preparation.

Conservation Status

Since the entire plant needs to be uprooted to gather the medicinal rhizomes, wild harvesting often causes plant death. For this reason, it is particularly vulnerable to over-harvesting. In some states, this plant is listed as "endangered." Today, Collinsonia is wild-harvested from public forests and cultivated under forest canopy.

2. Historical and Traditional Use

Indigenous North American Use

Collinsonia canadensis was used by Native Americans to treat a variety of ailments. Historically, stone root was used primarily by the Cherokee and Iroquois. The Iroquois used this plant as a cure-all but made specific note that it was given to listless children, as well as those with headaches or blood, heart, or kidney issues. The Cherokee noted use in treating swollen breasts, as a deodorant, and as an emetic to induce vomiting.

European-American settlers in North America did not often use this species after they initially discovered it, due to it lacking any conspicuous qualities, toxic or otherwise. It was not until later, after observing Native American medicinal uses of the plant, that the herb came into the broader materia medica.

Eclectic and 19th-Century Botanical Medicine

Named after the English botanist and friend of Benjamin Franklin, Peter Collins, Collinsonia root was first used for medicinal purposes in the 1800s by the Shakers and Eclectic physicians — physicians known for their medicinal use of botanicals native to North America. The Eclectic School, which emerged in the United States in the 1830s, arose from earlier botanical medicine movements and Native American herbal traditions. Practitioners primarily used plant-based drugs that were indigenous to the United States and developed a distinct "American materia medica." Lloyd Brothers, established in 1886 by brothers John Uri Lloyd, Curtis Gates Lloyd, and Nelson Ashley Lloyd, was a major supplier of quality botanical drugs for the eclectic physician.

Native to the Eastern United States, Collinsonia was used extensively by indigenous peoples and Eclectic Physicians for a variety of conditions related to improving the function of the gastrointestinal, respiratory, genitourinary, and circulatory systems.

An important bowel tonic, Collinsonia was used by the Eclectics to facilitate digestion — stimulating appetite, gastric secretions, and peristalsis — and to exert tonifying effects upon the mucosa of the gastrointestinal tract. It was given to relieve a range of concerns related to gastrointestinal discomfort including gastritis, diarrhea/constipation, dyspepsia, hemorrhoids, spasmodic stomach and intestines, tenesmus, anal fistula, proctitis, and others. Its astringent action was viewed as having a particular affinity towards tonifying weak vasculature, such as in venous congestion (e.g., hemorrhoids, varicose veins) and mitral regurgitation.

King's American Dispensatory records that some of the Eclectic physicians' first uses of Collinsonia root was to treat "minister's sore throat," an affliction now known as laryngitis, giving clues to stone root's affinity for mucosa conditions of the throat.

Its gentle, soothing properties made it a popular choice for addressing sore throats, hoarseness, and even voice loss among public speakers and singers.

Genitourinary and Women's Health Applications

The remedy was used with varying degrees of success by the profession in female disorders, including amenorrhea, dysmenorrhea, menorrhagia, vicarious menstruation, prolapsus uteri, leucorrhea, threatened abortion, and pruritus vulvae dependent on varicosis. Stone root, being diuretic and tonic, was formerly much used in genitourinary troubles. It was highly thought of in calculous diathesis. While considered very much overrated in some quarters, it was deemed "not without beneficial results in toning the renal organs and allaying irritation consequent upon the presence of gravel." It was considered a good remedy in vesical catarrh.

Cardiac and Circulatory Applications in Eclectic Practice

Collinsonia was described in classical Eclectic literature as acting as a tonic to the enfeebled muscular structure of the heart. It was said to be conspicuous in its ability to overcome relaxed and out-of-tone conditions of the walls of the veins, with a direct influence upon atonic and dilated or otherwise impaired conditions of the veins and arteries.

Traditional Topical Use

Eclectic-era practitioners and indigenous populations also used Collinsonia externally. Eclectic physicians believed the herb's roots formed a great poultice for bruises, burns, and sprains.

3. Key Chemical Constituents

Phenolic Acids and Polyphenolics

HPLC analysis identified rosmarinic acid as a major component in Collinsonia shoots and roots at 20.1 and 15.8 mg/g, respectively. An 80% methanol extract of the Collinsonia root also contained two other major compounds with spectra typical of phenolic compounds.

Rosmarinic acid (RosA) is a water-soluble phenolic compound that is an ester of caffeic acid and 3,4-dihydroxyphenyl lactic acid. It is found in many plants of the Boraginaceae and Lamiaceae families. RosA has a wide range of pharmacological effects, including anti-oxidative, anti-apoptotic, anti-tumorigenic, and anti-inflammatory effects.

Volatile Oil Constituents

Primary constituents found in Collinsonia root and leaves include polyphenolics (e.g., rosmarinic acid), volatile oils (thymol, carvacrol, and caryophyllene), saponins, tannins, and mucilage. The presence of thymol and carvacrol in the essential oil fraction connects Collinsonia to a broader class of phenolic monoterpenes well-studied in other Lamiaceae genera.

Flavonoids

Scutellarein is a bioactive compound isolated from the plant, found to possess various pharmacological properties including anti-inflammatory and antioxidant activities. Isoscutellarein, a flavonoid glycoside, is isolated from the roots and leaves of the plant and has been shown to exhibit anti-inflammatory and antioxidant activities, which may be beneficial in treating various diseases such as arthritis and cardiovascular disorders. Additionally, isoscutellarein has been reported to have antimicrobial properties, making it a potential agent against certain types of bacteria and fungi.

Saponins

Akeboside St(b) and two new saponins named collinsonin and collinsonidin were isolated from the roots of Collinsonia canadensis. The structure of collinsonin was established as 3-O-alpha-L-arabinopyranosylcollinsogenin. 16-alpha-Hydroxyhederagenin, obtained by hydrolysis, is a new sapogenin named collinsogenin. Collinsonidin has been identified as 3-O-beta-D-glucopyranosyl-(1'→3')-alpha-L-arabinopyranosylhederagenin. These plant-specific saponins — collinsonidin and collinsogenin — are considered distinctive phytochemical markers of the species.

Sesquiterpene Lactones

Sesquiterpene lactones are a type of bioactive compound found in the plant. These compounds are responsible for the herb's anti-inflammatory and antiseptic properties. Sesquiterpene lactones have been shown to exhibit significant inhibitory effects on enzymes involved in inflammation and allergic reactions, making them a valuable component of natural remedies for skin and respiratory issues.

Tannins, Mucilage, and Fatty Acids

Tannins and mucilage are likely responsible for astringent, vulnerary, and tonifying effects upon mucus membrane linings of the gastrointestinal and upper respiratory tracts. The primary fatty acids present are palmitic, stearic, oleic, linoleic, and linolenic acids.

Pharmacognostical Standardization

Traditionally the roots and rhizomes of the plant are used for various diseases. The pharmacognostical study and parameters related to physicochemical properties of plant — including macroscopy, microscopy (transverse section and powder microscopy), quantitative studies, foreign matter, ash values, extractive values, and loss on drying — have been assessed for roots and rhizomes of the plant, as no prior work on standardization had been conducted. The study found total ash at 8.0%, alcohol extractive value at 11.3%, and water-soluble extractive value at 8.33%.

4. Mechanisms of Action

Anti-Inflammatory Activity

The anti-inflammatory properties of Collinsonia extract were assessed using a lipopolysaccharide (LPS)-stimulated macrophage model (RAW 264.7 cells). The 80% methanol extract from Collinsonia inhibited LPS-stimulated nitrite production at a concentration corresponding to 5 mg of dry Collinsonia root per mL of media without producing toxicity.

Importantly, the anti-inflammatory effect appears to be synergistic rather than attributable to a single compound: Treatment of RAW cells with rosmarinic acid at an equimolar concentration as was present in the 5 mg/mL Collinsonia extract did not significantly inhibit LPS-stimulated nitrite production. However, a combination of all three major phenolic compounds at equimolar concentrations equivalent to the 5 mg/mL Collinsonia extract treatment did result in significant inhibition of LPS-stimulated nitrite production. This initial characterization demonstrated high concentrations of phenolic compounds with anti-inflammatory activity in macrophage cells.

Acetylcholinesterase Inhibition

C. canadensis has been found to prevent the breakdown of acetylcholine via inhibition of acetylcholinesterase, a key clinical enzyme involved in neurodegenerative diseases such as Alzheimer's disease (AD). Several bioactive compounds have been isolated from C. canadensis which have been found to be beneficial in the management of AD.

Other bioactive compounds from this plant — namely thymol, in the range of 0.5–2.0 mg/kg — have shown inhibition of cognitive impairments caused by the heightened level of amyloid beta (Aβ) or cholinergic hypofunction in Aβ models. Another compound from C. canadensis, carvacrol, was reported to exert 10 times stronger acetylcholinesterase inhibitory activity than thymol.

The total essential oil and selected compounds, specifically thymol, carvacrol, and their derivatives thymoquinone and thymohydroquinone, were tested for AChE inhibition. Thymohydroquinone exhibited the strongest AChE inhibitory effect over the range of concentrations. The AChE inhibitory potential decreased in the following order: thymohydroquinone > carvacrol > thymoquinone > essential oil > thymol > linalool.

Astringent and Tonic Action

The tannin content of Collinsonia root is central to its traditionally described astringent, tonifying, and vulnerary properties on mucous membranes. Astringent compounds cause precipitation of surface proteins in mucous membranes, leading to a tightening and tonifying effect that classical Eclectic physicians described as therapeutic for atonic veins, hemorrhoids, and inflamed mucosal surfaces.

Diuretic Activity

The plant is said to be diuretic and tonic, and useful in calculous affections. Modern herbalists and natural medical practitioners suggest it has potential as a diuretic and as a treatment for urinary tract pain.

5. Scientific Evidence by Area of Use

5.1 Gastrointestinal Health and Hemorrhoids

Traditional and Practitioner Basis: In the 21st century, Collinsonia root is most commonly used in natural health care for the treatment of hemorrhoids, a condition of vascular irritation of the rectal area with a general sense of "constriction" or pain in the lower abdomen. Based on Eclectic use, hemorrhoids and constipation — particularly when due to portal system congestion and venous capillary weakness — are perhaps the most direct indications for using Collinsonia.

Evidence Strength: As of 2023, no published clinical trials with Collinsonia have been conducted. Evidence in this area rests entirely on historical practitioner accounts, case descriptions, and in vitro mechanistic data rather than controlled human trials. The plant's constituent phenolics and saponins provide a plausible biochemical rationale, but no randomized controlled evidence exists for hemorrhoid treatment.

5.2 Anti-Inflammatory Effects

In Vitro Evidence: The most direct scientific investigation of Collinsonia is a preclinical study by Hanlon et al. (2009), published in The FASEB Journal. HPLC analysis identified rosmarinic acid as a major component in Collinsonia shoots and roots at 20.1 and 15.8 mg/g, respectively. An 80% methanol extract of the root also contained two other major compounds with spectra typical of phenolic compounds. The anti-inflammatory properties of Collinsonia extract were assessed using a lipopolysaccharide (LPS)-stimulated macrophage model (RAW 264.7 cells). The 80% methanol extract from Collinsonia inhibited LPS-stimulated nitrite production at a concentration corresponding to 5 mg of dry Collinsonia root per mL of media without producing toxicity.

A key finding of the study concerns synergism among constituents: The three major phenolics from Collinsonia root were purified using preparatory HPLC. Treatment of RAW cells with rosmarinic acid at an equimolar concentration as was present in the 5 mg/mL Collinsonia extract did not significantly inhibit LPS-stimulated nitrite production. However, a combination of all three major phenolic compounds at equimolar concentrations did result in significant inhibition of LPS-stimulated nitrite production.

Evidence Strength: This evidence is limited to a single in vitro macrophage model and has not been replicated in animal or human studies. The synergistic finding is scientifically interesting but preliminary.

5.3 Neurological and Cognitive Function (Alzheimer's Disease)

Several bioactive compounds have been isolated from C. canadensis which have been found to be beneficial in the management of Alzheimer's disease (AD). Its main mode of action in neurodegenerative diseases might be ascribed to its anti-inflammatory activities, in which the combination of major phenolic compounds from Collinsonia extract showed significant inhibition of LPS-stimulated nitrite production. Interestingly, C. canadensis has been found to prevent the breakdown of acetylcholine via inhibition of acetylcholinesterase, a key clinical enzyme involved in neurodegenerative diseases such as AD.

Evidence Strength: All evidence in this area is in vitro and, for thymol, in rodent models. Studies with compounds isolated from Collinsonia have indicated potential benefit in the management of neurodegenerative diseases such as Alzheimer's disease. No clinical or human trials exist. The connection to AD is indirect, drawing on the pharmacological activity of constituent compounds (thymol, carvacrol, rosmarinic acid) that are also found in other widely studied plants. This evidence is considered hypothesis-generating at best.

5.4 Genitourinary System

Stone root, being diuretic and tonic, was formerly much used in genitourinary troubles. It was highly thought of in calculous diathesis. While very much overrated in some clinical estimation, it is probable that it was not without beneficial results in toning the renal organs and allaying irritation consequent upon the presence of gravel. It was considered a good remedy in vesical catarrh.

There are no modern scientific accounts of stone root use; however, modern registered herbalists recommend Collinsonia root to support the urinary system and as a strong diuretic when needed. Human clinical research is required to confirm this finding.

5.5 Upper Respiratory Tract and Voice

The respiratory indications of Collinsonia in historical practice center on its astringent and mucous membrane-tonifying properties. Its astringency was considered to relieve hoarseness and cough secondary to overuse of the voice, sore throat, chronic laryngitis, and chronic bronchitis. No controlled clinical studies have evaluated Collinsonia for these indications.

5.6 Cardiovascular and Venous System

Classical Eclectic literature described Collinsonia as a heart tonic of direct and permanent influence. Its continued use was said to induce steady, permanent, and highly satisfactory improvement in the strength and character of cardiac function, and a correspondingly improved general circulation. These claims originate entirely from 19th-century clinical observation and have not been subjected to modern pharmacological or clinical investigation.

5.7 Overall Evidence Assessment

The totality of clinical evidence for Collinsonia canadensis is extremely limited. The only modern experimental science consists of one in vitro macrophage model demonstrating anti-inflammatory effects, and pharmacological studies on individual constituent compounds (rosmarinic acid, thymol, carvacrol) derived primarily from research on other plants in which those compounds are more abundantly studied. Although the physiological actions of Collinsonia have not been sufficiently studied, its extensive historical use draws upon numerous case studies and observed effects which elucidate its medicinal profile. No phase I, II, or III clinical trials for any indication have been identified in the published literature.

6. Body Systems Associated with Collinsonia

Native to the Eastern United States, Collinsonia has been used extensively by indigenous peoples and Eclectic Physicians for a variety of conditions related to improving the function of the gastrointestinal, respiratory, genitourinary, and circulatory systems. The following specific body system associations are documented in traditional medical texts:

• Gastrointestinal system: Bowel tonic, appetite stimulation, relief of constipation, hemorrhoids, proctitis, tenesmus, and dyspepsia.
• Venous and circulatory system: Venous congestion, hemorrhoids, varicose veins, and mitral valve conditions in classical Eclectic accounts.
• Upper respiratory tract: Laryngitis, hoarseness, sore throat, chronic bronchitis, and voice loss.
• Genitourinary system: Kidney stone support, vesical catarrh, and general urinary tonic activity.
• Neurological system (preclinical only): Acetylcholinesterase inhibition relevant to neurodegenerative disease research.

7. Dosage Forms and Reported Dosages

The British Herbal Pharmacopoeia suggests using 1–4 g of the dried root daily.

For infusion (tea), 1–2 teaspoons of dried root are added to 1 cup of boiling water, infused for 10–15 minutes, and drunk 3 times per day.

Tincture (1:5): 1 to 2 mL, three times daily. Fluid Extract (1:1): 1 to 4 mL, three times daily.

Classical 19th-century dosage records indicate broader ranges: Very old case reports note 1 cup (240 mL) of infusion, 10–60 grains of powdered root, 1–3.5 mL of root extract, or up to 7 mL of tincture as the most common dosages.

Ellingwood's classical Eclectic formulary specified: Extractum Collinsoniae Fluidum (Fluid Extract of Collinsonia): dose from two to fifteen minims. Tinctura Collinsoniae (Tincture of Collinsonia): dose from five to thirty minims.

Due to a lack of recent scientific studies on Collinsonia root, little data exists on its effective dosages. Appropriate dosages likely depend on factors such as age, particular ailments, and overall health status.

8. Safety Considerations

General Safety Profile

Based on old reports, Collinsonia root appears generally safe in moderation. Ingestion of large amounts may cause gastrointestinal upset. No formal toxicological studies establishing lethal dose parameters, maximum tolerated doses, or organ-specific toxicity thresholds for the whole root extract have been identified in the published literature reviewed.

Pregnancy and Lactation

The Botanical Safety Handbook indicates that "stone root was used to stop threatened abortions and to treat hemorrhoids in pregnant women"; however, there are no trials on the safety of using Collinsonia root while pregnant or breastfeeding. The herb is generally designated as one to avoid in pregnancy and lactation due to unknown effects. These two positions reflect an unresolved tension between historical Eclectic therapeutic use and the absence of modern safety data.

Drug Interactions

No drug interactions with Collinsonia are currently known. However, the presence of rosmarinic acid — which has documented anti-platelet and anti-inflammatory activity in the broader scientific literature — and volatile oils with acetylcholinesterase-inhibiting properties means that theoretical interactions with anticoagulants, anti-inflammatory drugs, and cholinergic medications cannot be ruled out, though no case reports or pharmacokinetic studies documenting actual interactions have been identified.

Conservation Concerns as a Safety-Adjacent Issue

Since the entire plant needs to be uprooted to gather the medicinal rhizomes, wild harvesting often causes plant death. For this reason, it is particularly vulnerable to over-harvesting. This has practical implications for raw material standardization and adulteration risk, factors relevant to supplement quality and safety.

Gastrointestinal Tolerability

Historical Eclectic sources noted that high doses of the concentrated tincture could be poorly tolerated. The fluid extract acts with great certainty, but much remains to be learned concerning its range of application; one thing is certain, however, namely, that a dose varying from ten to thirty drops four or five times a day of the "concentrated tincture" is too large, with better results having been obtained from doses of five drops four times a day. This historical observation suggests a dose-dependent gastrointestinal tolerability ceiling, though modern controlled data are absent.

References

• Wikipedia — Collinsonia canadensis
• WikiDoc — Collinsonia canadensis
• ScienceDirect — Mahomoodally et al., Collinsonia canadensis L. In Naturally Occurring Chemicals Against Alzheimer's Disease (Academic Press, 2021)
• ResearchGate — Collinsonia canadensis L. (review chapter, 2021)
• ResearchGate — Hanlon et al. (2009), A methanol extract from Collinsonia canadensis root decreases LPS-induced inflammatory response in murine macrophages. FASEB Journal
• ResearchGate — Abascal & Yarnell (2005), Botanical Treatments for Hemorrhoids. Alternative and Complementary Medicine
• ResearchGate — Joshi et al. (1992/2004), Saponins from Collinsonia canadensis. Journal of Natural Products
• ACS Publications — Saponins from Collinsonia canadensis. Journal of Natural Products
• PMC — Review of Anti-Inflammatory Effects of Rosmarinic Acid on Inflammatory Diseases (2020)
• PubMed — Anti-inflammatory effect of rosmarinic acid and an extract of Rosmarinus officinalis in rat models (2014)
• PubMed — Anti-inflammatory and anti-allergic effect of rosmarinic acid; inhibition of seasonal allergic rhinoconjunctivitis (2005)
• PubMed — In vitro acetylcholinesterase inhibitory properties of thymol, carvacrol and their derivatives
• Academia.edu — Kaur & Sekhon, Pharmacognostical Standardization of Roots and Rhizomes of Collinsonia canadensis
• WholisticMatters — Collinsonia Root: Digestive Health
• WholisticMatters — Collinsonia canadensis Herb Detail
• WholisticMatters — Collinsonia Root: A Remedy Rooted in American History
• The Botanical Institute — Collinsonia Root: Dosage & Safety
• United Plant Savers — Stone Root (Collinsonia canadensis)
• National Museum of American History — Collinsonia canadensis (Lloyd Brothers collection)
• PMC — The Phytochemistry of Cherokee Aromatic Medicinal Plants
• Henriette's Herbal — King's American Dispensatory (Felter & Lloyd, 1898): Collinsonia
• Henriette's Herbal — Ellingwood's American Materia Medica: Collinsonia
• Henriette's Herbal — Povall (1888), Collinsonia canadensis, Eclectic Medical Journal
• Lloyd Brothers (1904) — A Treatise on Collinsonia canadensis