Stone root

Other Names

Canada horsebalmCitronellaCollinsoniaCollinsonia angustifolia Raf.Collinsonia canadensisCollinsonia canadensis L.Collinsonia canadensis var. cordata PurshCollinsonia canadensis var. ovata PurshCollinsonia canadensis var. tuberosa (Michx.) Alph.WoodCollinsonia cuneata Wender.Collinsonia decussata MoenchCollinsonia ovalis PurshCollinsonia praecox WalterCollinsonia scabra Pers.Collinsonia scabriuscula AitonCollinsonia scabriuscula var. puberula Benth.Collinsonia tuberosa Michx.Collinsonia urticifolia Salisb.Hard-hackHardbackHardhackHeal-allHorse balmHorse-weedHorsebalmHorseweedKnob grassKnob rootKnob weedKnobrootKnobweedNorthern horse-balmOx-balmPleuradenia praecox (Walter) Raf.Pleuradenia scabra Raf.Rich-leafRich-weedRichleafRichweedStoneroot

Synopsis

Stone Root (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. Its accepted scientific name is Collinsonia canadensis L., where the species epithet honors its native range, and the genus name commemorates the English botanist Peter Collinson. The plant was discovered and named after the English botanist Peter Collinson. More specifically, 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.

Other common names include Collinsonia, knob-root, knobgrass, knobweed, knotroot, horse-balm, horseweed, richweed, richleaf, ox-balm, and citronella. It is also known colloquially as stone root, heal-all, hard-hack, and hardhack. The common name "stone root" has a precise origin: it is best known under the rational name of Stone-root, which applies because the root is both very heavy and very hard, the term having been originally employed by the Shakers, who first packed the drug for commerce.

Morphology 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.

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.

A member of the mint family (Lamiaceae), it is characterized by its large, lemon-scented leaves and terminal spikes of pale yellow flowers. The plant's name is derived from its extremely hard, knotty, and "stone-like" rhizome, which is the primary part harvested for botanical use. The root is very hard and heavy, difficult to pulverize or process into powder.

Conservation Status

As the most common part of Collinsonia canadensis to be used is the root, wild harvest commonly results in the death of the plant, making it particularly vulnerable to overharvest. Collinsonia canadensis is listed as "Endangered" in Wisconsin. Today Collinsonia is wild harvested from public forests and cultivated under forest canopy.

Dosage Forms and Common Preparations

Although it can be sourced in its whole form and fresh or dried, it's commonly purchased ground, encapsulated, or as a tea, tincture, or liquid extract. Because the fresh root is exceptionally hard and possesses a pungent, distinct aroma, it is typically dried and either coarsely chopped for simmering or ground into a fine powder. All preparations should be made from the green plant, according to 19th-century Eclectic medical texts. Both the root and the rhizome are utilized for internal preparations, but the leaves are also associated with health benefits. Collinsonia leaves are traditionally used as a poultice to treat sprains, burns, bruises, ulcers, and other wounds, as it may improve capillary function and support speedy healing.

2. Traditional and Historical Use

Native American Traditions

Collinsonia canadensis, or Stone Root, a perennial plant in the mint family has its origins as a medicinal herb in Native American culture. 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.

Stone Root is one of many plants that European settlers learned about from Native Americans. The Iroquois in particular had many uses for tea prepared from the root: for diarrhea with blood, for arthritis, both topically and internally; for boils; as a blood medicine; for heart or kidney trouble; as a panacea; as a stimulant and strengthener for babies and children.

Entry into Formal Western Materia Medica

Collinsonia was not used in European or American medicine at an early date; as the Lloyd Brothers pamphlet on the herb states, it did not attract the attention of authoritative observers of the regular school, "probably because it possessed no prominent, poisonous or violent quality to make it conspicuous." It does have a distinct odor, described by herbalist David Winston as smelling like "Lemon Pledge." By the 1850s it was listed in King's American Dispensatory and in Lee's New York Plants. Lee noted that the bruised leaves had been used for many years as poultices for bruises and that the Thompsonian medicalists had referred to it in their pamphlets.

Named after the English botanist 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 Shakers were the first to pack the root commercially, and it became a distinctive feature of North American botanical practice.

Eclectic Medicine (19th–Early 20th Century)

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 Eclectic physicians — the dominant 19th-century American botanical medicine tradition — used stone root with notable breadth. One of the first uses of collinsonia by Eclectics was in the treatment of that form of laryngitis known as "minister's sore throat." For this condition it is described as the best agent they possessed. It is equally valuable in other forms of chronic laryngitis, pharyngitis, and in some cases of chronic bronchitis, and tracheitis. It is an excellent remedy for aphonia, resulting from vascular hyperemia, or from congestion.

One of collinsonia root's earliest uses was for a specific type of laryngitis referred to as "minister's sore throat." This condition was described as resulting from the "prolonged and excessive use of the voice in a strained or unnatural key."

An important bowel tonic, Collinsonia was used by the Eclectics to facilitate digestion (e.g. stimulate appetite, gastric secretions and peristalsis) and exert tonifying effects upon the mucosa of the gastrointestinal tract. In diseases of the gastro-intestinal tract, it is described as beneficial in relieving irritation, improving the appetite, promoting the flow of gastric juice, and in exerting a decided tonic effect upon the organs involved.

An 1888 account in the Electric Medical Journal states that Collinsonia has a marked action upon the left side of the heart, relieving irritation and increasing the power and regularity of contraction. In mitral regurgitation and in the cough of heart disease, the remedy had proven efficacious; the indications for its use are found in flatulency, palpitation, and indigestion.

Perhaps the most noticeable historical action of the remedy was that which was manifested upon the mucous membrane of the throat, as a remedy for follicular pharyngitis, chronic laryngitis, and chronic bronchitis. Under its influence the secretion from the kidneys is increased, and dropsical fluids are removed. In chronic catarrh of the bladder and in leucorrhoea, Collinsonia is described as valuable.

Collinsonia was said to pass from the blood through the kidneys, exerting upon them its tonic action, and this action was described as manifested upon the whole urinary tract. As a remedy for calculous deposits it was considered most valuable, preventing the tendency to the formation of calculi, and expediting the removal of such as have already formed.

Eclectic physicians Felter and Lloyd documented the herb's use in their landmark reference text. They described Collinsonia canadensis as one of the main herbs for a "hemorrhoidal and constipated state due to vascular engorgement of the pelvic viscera." Their King's American Dispensatory also observed that the use of the herb was "not without beneficial results in toning the renal organs and allaying irritation consequent upon the presence of gravel."

Traditional Preparations Summarized

It was administered as a tea, tincture, or poultice to ease symptoms of kidney stones, bladder inflammation, and hemorrhoids.
The rhizomes were used for internal issues, while the leaves were used as a poultice for bruises, wounds, external ulcers, and burns.
Herbalists and Eclectic doctors prescribed Stone Root to help pass kidney and gallbladder stones, to strengthen weak veins and improve pelvic circulation, and for many issues centering around the genitourinary tract and especially the colon, rectum, and anus.

3. Phytochemistry: Key Constituents and Active Compounds

Polyphenolics and Caffeic Acid Derivatives

Primary constituents that have been found with Collinsonia root and leaves include polyphenolics (e.g. rosmarinic acid), volatile oils (thymol, carvacrol, and caryophyllene), saponins, tannins, and mucilage.

Rosmarinic acid is established as the principal phenolic compound. HPLC analysis identified rosmarinic acid as a major component in Collinsonia shoots and the roots at 20.1 and 15.8 mg/g, respectively. A 80% methanol extract of the Collinsonia root also contained two other major compounds with spectra typical of phenolic compounds. Rosmarinic acid is itself a well-characterized molecule: this naturally-occurring phenol acid is an ester, the esterification product of a caffeic acid and a 3,4-dihydroxyphenyl lactic acid. Rosmarinic acid has been successively found in more than 160 plants belonging to Lamiaceae, Boraginaceae, Apiaceae, and others. It has been investigated for its miscellaneous pharmacological activities including anti-oxidative activity, anti-inflammatory activity, and anti-viral activity.

Volatile Oils

Key constituents of Collinsonia include flavonoids, polyphenolics and caffeic acid derivatives (e.g. rosmarinic acid), volatile oils including thymol, carvacrol, and caryophyllene, and saponins including akeboside, collinsonidin, and collinsogenin. The volatile oils — thymol, carvacrol, and caryophyllene — are shared with a number of other Lamiaceae species and have been independently studied for biological activity.

Saponins

Akeboside St(b) and two new saponins named collinsonin and collinsonidin were isolated from the roots of Collinsonia canadensis. On the basis of chemical and spectral studies, the structure of collinsonin has been established as 3-O-alpha-L-ambinopymnosylcollinsogenin. 16-alpha-Hydroxyhederagenin, obtained by the hydrolysis of collinsonin, is a new sapogenin named collinsogenin. Collinsonidin has been identified as 3-O-beta-D-glucopyranosyl-(1'→3')-alpha-L-arabinopyranosylhederagenin. These saponins are plant-unique isolates representing a distinctive phytochemical fingerprint for the species.

Flavonoids

Stone root also contains a range of flavonoid compounds. A 1999 study published in the Journal of Natural Products reported that a new flavonoid, 2,5-dihydroxy-6,7-dimethoxyflavanone, was isolated from the leaf and stem exudates of Collinsonia canadensis along with three known flavones, baicalein-6,7-dimethyl ether, norwogenin-7,8-dimethyl ether, and tectochrysin (5-hydroxy-7-methoxyflavone).

Additional Constituents

Early 19th-century chemical analysis found the plant to contain resin, starch, tannin, wax in all parts of the plant, mucilage in the root, and volatile oil in the leaves. Like some other herbs, including several in the Lamiaceae (mint) family, Stone Root contains the antioxidant and anti-inflammatory compound rosmarinic acid.

4. Proposed Mechanisms of Action

Anti-Inflammatory Activity

The most mechanistically studied activity of stone root extracts is anti-inflammatory action. 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.

The three major phenolics from Collinsonia root were then 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 equimolar to the 5 mg/mL Collinsonia extract treatment did result in significant inhibition of LPS-stimulated nitrite production. This finding is notable: it suggests synergistic interaction among the phenolics, and that rosmarinic acid alone does not account for the observed effect.

This initial characterization of a methanol extract from Collinsonia demonstrated high concentrations of phenolic compounds with anti-inflammatory activity in macrophage cells.

Acetylcholinesterase Inhibition

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 Alzheimer's disease. This effect is believed to be partially attributable to its volatile oil constituents. Research on structurally related monoterpenes found that thymohydroquinone exhibited the strongest AChE inhibitory effect over the range of concentrations tested. The AChE inhibitory potential decreased in the following order: thymohydroquinone > carvacrol > thymoquinone > essential oil > thymol > linalool. Since thymol and carvacrol are documented constituents of Collinsonia canadensis, this mechanism has been proposed as relevant to the plant's own potential neuroprotective properties.

Venous and Vascular Tone

The historical Eclectic rationale for the vascular effects of stone root centered on its effect on venous muscle tone. Collinsonia acts as a tonic to enfeebled muscular structure of the heart. It is conspicuous in its ability to overcome relaxed and out-of-tone conditions of the walls of the veins. It has a direct influence upon atonic and dilated or otherwise impaired conditions of the veins and arteries. The flavonoid and saponin constituents — classes of compounds with established venotonic and capillary-stabilizing activities in other medicinal plants — are generally held responsible for these observed properties.

Astringency and Mucous Membrane Tonification

Though all parts of the plant have been used for medicinal purposes, the root is often given internally while its leaves are applied topically to aid in wound healing. The tannins, mucilage, and resinous components present in the root are consistent with the traditional astringent and mucous membrane–tonifying properties attributed to this plant. Given a dry, harsh mucous membrane with engorged capillaries, Collinsonia in the proper doses was described as acting specifically to relieve the condition. The dry, harsh, engorged membrane was considered a certain indication for the remedy.

5. Scientific Evidence by Area of Use

5.1 Anti-Inflammatory Activity (In Vitro)

Study type and finding: The most rigorous laboratory study on stone root was published in the FASEB Journal in 2009 by Hanlon et al. (Standard Process, Inc.). It employed an in vitro model using LPS-stimulated murine RAW 264.7 macrophages. HPLC analysis identified rosmarinic acid as a major component in Collinsonia shoots and the 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. The anti-inflammatory properties of Collinsonia extract were then assessed using the LPS-stimulated macrophage model. 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.

Limitation: This study was conducted entirely in vitro (cell culture model only). There are no human clinical trials or animal in vivo studies confirming that the anti-inflammatory properties translate to living organisms or clinically meaningful outcomes. The evidence level for anti-inflammatory activity is therefore preliminary and limited to in vitro data.

5.2 Hemorrhoids and Venous Insufficiency

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.

Hemorrhoids are also considered a sign of portal system congestion, as well as a venous and capillary weakness, and Collinsonia has become an important remedy in their treatment. Collinsonia root is used to support various circulatory conditions and is believed to help support the integrity of blood vessels, which is why it is sometimes used as a remedy for varicose veins.

Evidence assessment: Modern scientific research on Collinsonia's effectiveness for vein support is extremely limited. A few early 20th-century herbal texts and anecdotal case reports mention its benefits, but there are no large-scale clinical trials or well-designed studies validating these historical uses. Some preliminary laboratory studies have indicated potential for anti-inflammatory and vasoprotective actions, supporting its traditional use for vascular conditions like hemorrhoids and varicose veins. However, comprehensive human clinical trials are limited, and most evidence remains anecdotal. The saponin and flavonoid constituents of stone root — compound classes associated with venotonic activity in better-studied botanicals such as horse chestnut — provide a plausible phytochemical rationale, but direct clinical evidence for stone root itself is lacking.

5.3 Digestive System Effects

In diseases of the stomach marked by debility of the nutritive functions, historical reports state that Collinsonia acts with certainty; under its influence the flow of gastric juice is increased, and the peristaltic action of the stomach is improved. Physiologically, Collinsonia stimulates the stomach, promoting its own absorption. It is described as actively tonic in its influence upon the entire function of this organ, and from this influence its beneficial action is described as exercised upon the function of all the vital organs.

Evidence assessment: These accounts derive entirely from 19th-century Eclectic medical case series and clinical observations. There are no controlled clinical studies examining stone root's effects on gastrointestinal function. The evidence base is historical and observational only.

5.4 Urinary Tract and Kidney Stone Applications

Historically, Native American tribes and early settlers recognized stone root for its remarkable medicinal properties. For centuries, it was prized as a remedy for urinary tract and kidney issues, earning its common name due to its reputed ability to help dissolve kidney and bladder stones.

Herbalist Maud Grieve, in her widely-cited A Modern Herbal, described stone root as helpful for "catarrh of the bladder [inflammation of the bladder], gravel [kidney stones], and…complaints of urinary organs," and wrote that a decoction of the fresh root is the best herbal remedy to soothe these issues.

Evidence assessment: While Stone Root has a history of traditional use, scientific research on its medicinal properties is limited, and more studies are needed. No controlled human studies on stone root for kidney stones or urinary tract conditions have been published in peer-reviewed literature.

5.5 Respiratory Tract Applications

Since Collinsonia is regarded as a tonic for mucosa, it has been used for any irritation of the mouth and throat, including laryngitis, pharyngitis, and even bronchitis. Its gentle, soothing properties made it a popular choice for addressing sore throats, hoarseness, and even voice loss among public speakers and singers.

Evidence assessment: These uses are exclusively supported by historical clinical accounts from Eclectic physicians and herbal compendium references. No controlled clinical studies have examined stone root specifically for respiratory mucous membrane conditions.

5.6 Alzheimer's Disease and Neuroprotective Potential (Preclinical)

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 lipopolysaccharide-stimulated nitrite production.

Recent research suggests that the anti-inflammatory compounds in collinsonia root may be useful in the management of Alzheimer's disease. More specifically, collinsonia root contains polyphenols, thymol, and carvacrol, all of which may help prevent the breakdown of a key enzyme involved in the onset and progression of Alzheimer's disease.

Evidence assessment: Evidence for neuroprotective applications is entirely preclinical — specifically in vitro (macrophage inflammation models and acetylcholinesterase inhibition assays). No animal or human studies have examined stone root's effects on neurodegenerative conditions. This application area should be considered highly preliminary.

6. Body Systems and Health Areas of Association

Based on documented traditional use and available phytochemical or in vitro evidence, stone root has been historically associated with the following body systems:

Venous and circulatory system: 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. Specific vascular applications include support for hemorrhoids, varicose veins, and venous tone.
Gastrointestinal tract: Traditionally used as a bowel tonic, it was employed for constipation associated with rectal venous congestion, promotion of gastric secretions, and as a general GI mucous membrane tonic.
Respiratory mucous membranes: Throat conditions including laryngitis, pharyngitis, and "minister's sore throat"; also chronic bronchitis and hoarseness.
Genitourinary system: Kidney stones, bladder catarrh, urinary tract irritation, and as a diuretic tonic.
Cardiovascular system: It has also been historically used as a tonic to support the blood vessels of the heart and cardiovascular system.
Dermatological (topical): Though all parts of the plant have been used for medicinal purposes, the root is often given internally while its leaves are applied topically to aid in wound healing.

7. Dosage Forms and Reported Dosages

Modern scientific validation of stone root's benefits is still emerging. Because of this, reliable contemporary dosing data is sparse and the following dosages derive from historical herbal literature.

Historical accounts reference common dosages such as 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. However, modern studies are necessary to determine which preparations or dosages — if any — are truly effective.

The British Herbal Pharmacopeia provides the most specific pharmacopeial reference: the British Herbal Pharmacopeia suggests using 1–4 g of the dried root daily.

Additional traditional dosage forms reported in Eclectic texts include:

Tincture (1:5): 1 to 2 ml, 3×/day. Fluid Extract (1:1): 1 to 4 ml, 3×/day.
Fluid Extract of Collinsonia: dose from two to fifteen minims.
Tincture of Collinsonia: dose from five to thirty minims.

Because contemporary studies on collinsonia root are scarce, reliable dosing information is limited. Optimal dosages likely vary with age, the condition being treated, and overall health status.

8. Safety Considerations and Interactions

General Safety Profile

Based on old reports, collinsonia root appears generally safe in moderation. Small doses purportedly produce a warm sensation in the stomach or bowels, while larger doses may cause excessive sweating, nausea, or repeated vomiting.

When fresh and green, even small doses of the root will cause emesis, according to 19th-century Eclectic accounts — reinforcing the importance of using appropriately dried and processed preparations.

Gastrointestinal Effects

Ingestion of large amounts may cause gastrointestinal upset. It is essential to take precautions to avoid side effects, including gastrointestinal upset and allergic reactions. For example, taking high doses can lead to stomach cramps, diarrhea, and nausea, while allergic reactions can cause skin irritation and respiratory issues.

Pregnancy and Lactation

Use should be avoided in pregnancy and lactation due to unknown effects, though Eclectic medical texts indicate that it was used to treat hemorrhoids in pregnant women. This historical use should not be interpreted as establishing safety, as those accounts were observational and lack modern pharmacovigilance.

Emetic Properties of Leaves

The Cherokee noted use of stone root as an emetic to induce vomiting. It is said that the leaves can be taken to induce vomiting. The emetic property is most strongly associated with the leaves and with large doses of the fresh root, making preparation method and dose critical safety considerations.

Known Drug Interactions

No known drug interactions have been documented in the available herbal literature. However, the absence of interaction data reflects the complete absence of formal pharmacokinetic studies on stone root and should not be construed as a confirmation of safety in polypharmacy settings.

Conservation and Sustainability Note

As the most common part of Collinsonia canadensis to be used is the root, wild harvest commonly results in the death of the plant, making it particularly vulnerable to overharvest. This has practical implications for supply quality and consistency of commercial preparations.

9. Overall Evidence Assessment

Stone root (Collinsonia canadensis) has a rich and well-documented history of traditional use spanning multiple Native American peoples and the North American Eclectic medical tradition of the 19th century. It occupies a distinctive niche as a venous tonic, mucous membrane trophorestorative, and urinary herb. However, although the physiological actions of Collinsonia have not been sufficiently studied, its extensive historical use draws upon numerous case studies and observed effects. Considered one of the most valuable indigenous American medicinal plants, "Stone Root" is one of Collinsonia's many common names due to its dark color, dense rhizome, and fibrous roots.

The most important scientific work to date remains the 2009 in vitro study by Hanlon et al. demonstrating anti-inflammatory activity of a methanol extract in murine macrophages, and phytochemical studies identifying rosmarinic acid, plant-unique saponins (collinsonin, collinsonidin), and novel flavonoids as key constituents. Evidence for human clinical efficacy in any indication — hemorrhoids, venous insufficiency, urinary conditions, respiratory mucous membrane disease, or Alzheimer's disease — is currently absent. All clinical applications rest on historical use, Eclectic case reports, herbal authority texts, and pharmacological plausibility from constituent studies.

References

Health Conditions

Health conditions that Stone root may help support.

No conditions available.

Body Systems

Body systems that Stone root may help support.

No body systems available.