Aquilegia viridiflora (Green Columbine): A Comprehensive Reference
1. Identity and Botanical Description
Taxonomic Classification and Nomenclature
Aquilegia viridiflora Pall. is the accepted binomial name for the species, first formally published by Peter Simon Pallas in Acta Academiae Scientiarum Imperialis Petropolitanae 2: 260 (1779). It is commonly known as the green columbine or green-flowered columbine, and is a perennial flowering plant in the family Ranunculaceae, native to southern Siberia, northern China, Mongolia, and Japan. Within plant systematics it belongs to the Ranunculaceae (buttercup) family, native to Asia.
The plant is listed in A Scientific Dataset of Useful Plants of China as a medicinal plant, with the accepted Chinese name 耧斗菜 (lóu dǒu cài) in simplified Chinese, and the specific epithet 绿花耧斗菜 (lǜ huā lóu dǒu cài). Botanical synonyms include Aquilegia flava Lam. (1783), Aquilegia lutea Lam. (1783), and Aquilegia hybrida Sims (1809).
Varieties
The species produces 3–7 nodding flowers measuring 1.5–2 cm across which are either yellowish-green (in the variety viridiflora) or dark purple (var. atropurpurea). The sepals and petals measure 1.5 cm or less, and the petals have straight or slightly incurved nectar spurs of 1.2 to 1.8 cm in length. These two botanical varieties are formally recognized in the Plants of the World Online (Kew Science) database.
Morphology
The plant is a herbaceous perennial growing to 15–50 cm tall, with hairy or glandular stems that often branch towards the top. It has few basal leaves, which are biternate and mostly smooth with stalks of up to 18 cm. Nodding, sweetly fragrant flowers feature yellowish-green sepals and petals, yellowish-green to brownish-red petal limbs, and short straight spurs. Flowers bloom in 3–7 flowered cymose inflorescences in spring (April to early June) over biternate blue-green leaves.
Etymology
The genus name Aquilegia comes from the Latin word for eagle, in reference to the flower's five spurs which purportedly resemble an eagle's talon. The specific epithet comes from the Latin word viridiflorus, meaning "having green flowers."
Natural Habitat and Range
In the wild, the species is found in forests, grassy slopes, valleys, stream banks, and wet places in China, Japan, and Russia (Siberia). The nominal variety, A. viridiflora var. viridiflora, is native to China across the provinces of Gansu, Hebei, Heilongjiang, Hubei, Jilin, Liaoning, Nei Mongol, Ningxia, Shaanxi, Shandong, and Shanxi, as well as Japan, Mongolia, and Siberia.
Common Forms and Preparations
Despite often being toxic, columbines have been in use by humans as herbal remedies, perfume, and food. In the context of phytochemical research, preparations of Aquilegia species, including those closely related to A. viridiflora, have been produced as aqueous decoctions, methanol extracts, ethanol extracts, and ethyl acetate extracts for laboratory analysis. Four types of extracts have been prepared in published studies using solvents of different polarities — distilled water, methanol, ethanol, and ethyl acetate — and evaluated to determine the best candidate for potent bioactivity. No standardized commercial supplement form specific to A. viridiflora has been identified in the peer-reviewed or regulatory literature.
2. Traditional and Historical Use
Overview of the Aquilegia Genus in Traditional Medicine
Asian traditional medicine practitioners, Indigenous North Americans, and medieval Europeans have all considered portions of Aquilegia plants to have medicinal uses. Archaeological evidence suggests Aquilegia plants were in cultivation by the 3rd century AD in Roman Britain.
East Asian and Mongolian Traditions
The Aquilegia L. genus has been used to treat a variety of diseases in traditional medicine systems, particularly digestive organ dysfunctions such as stomach ulcer, liver disease, as well as cancer, lung disease, and rheumatic diseases. A. viridiflora itself grows within the territories of the Mongolian nomadic peoples and has been part of the broader Mongolian-Siberian medicinal plant repertoire. In Mongolia, five species of the Aquilegia genus grow — including A. viridiflora Pall. — and their phytochemical and biological activities have not yet been formally studied in the literature as of the date of that review.
Traditional Mongolian Medicine (TMM), like Traditional Chinese Medicine (TCM), is one of the most important ethnic medicines with systematic theories, having developed over thousands of years among the Mongolian people and deriving from Mongolian Folk Medicine (MFM). Folk medicine, based on the experiences of nomadic people, has its own unique medical theory, techniques, and medications in Mongolia. Some aspects of Mongolian folk medicine — along with elements from other Asian systems such as Tibetan medicine, Ayurveda, and traditional Chinese medicine — have been integrated into the Mongolian medical system.
Related Species in Parallel Traditions
Because direct ethnographic documentation specific to A. viridiflora in peer-reviewed sources is limited, the traditional use context for closely related Aquilegia species in the same region provides relevant comparative information. The related species Aquilegia pubiflora (Himalayan Columbine) has been used as traditional treatment for various human diseases including skin burns, jaundice, hepatitis, wound healing, and cardiovascular and circulatory diseases.
In European tradition, the first reliable descriptions of Aquilegia vulgaris were written by medieval European mystics and scientists, including the 12th-century abbess Hildegard of Bingen — who considered the plant's herbal functions — and the 13th-century friar Albertus Magnus. The 17th-century English herbalist Nicholas Culpeper recommended the seeds taken in wine to speed the process of childbirth. In modern herbal medicine the plant has been used as an astringent and diuretic.
Columbines were associated with fertility goddesses in ancient Greek and Roman religion and connected to Christian religious concepts. Columbine has been regarded as a religious symbol of purity and is often depicted in paintings together with the Virgin Mary. In traditional herbalism the plant was considered sacred to the goddess Venus.
3. Key Constituents and Active Compounds
Overview of Phytochemical Classes Across the Genus
Phytochemical studies of the Aquilegia L. genus have been underway since the 1960s, and as of the most recent reviews, 57 natural compounds have been isolated from 16 plant species. These include labdane diterpenes (3.5%), cycloartane triterpenes (22.8%), flavonoids (38.5%), alkaloids and nitrogen-containing compounds (17.5%), as well as phenolic acids and fatty acids. Among these, 19 new natural compounds belonging to cycloartane glycosides, labdane diterpenes, flavoalkaloids, and nitrile nitrogen compounds have been identified; the presence of flavoalkaloids is considered a specific chemical characterization of Aquilegia species.
Flavonoids
Flavonoids represent the largest single phytochemical class within the genus. In related Asian Aquilegia species, published HPLC studies have identified a consistent panel. Eight compounds have been identified, including four flavonoids — vitexin, orientin, isovitexin, and isoorientin — and four derivatives of hydroxycinnamic acid — chlorogenic acid, ferulic acid, sinapic acid, and p-coumaric acid.
In the related species Aquilegia ecalcarata, isolated compounds include beta-sitosterol, isoorientin-7-O-glucoside, isovitexin-4′-O-glucoside, isovitexin-2′-O-rhamnoside, and luteolin-7-O-glucoside. In A. ecalcarata, flavones apigenin, apigenin-7,4′-dimethyl ether, and luteolin have also been documented.
Plants from the Aquilegia genus mainly contain flavonoid constituents.
Flavoalkaloids (Flavonoid Alkaloids)
Two new flavonoid alkaloids, aquiledine and isoaquiledine, were isolated from the whole herb of Aquilegia ecalcarata, and their structures were determined by detailed spectral analysis. Flavonoids containing nitrogen are very rare natural products. As of the date of that publication, only eight flavonoidal alkaloids had been reported across all of plant chemistry, with aquiledine and isoaquiledine from Aquilegia ecalcarata being among them.
Cycloartane Triterpene Glycosides (Aquilegiosides)
Cycloartane-type glycosides named aquilegiosides A and B were isolated from the dried aerial parts of Aquilegia flabellata. Four additional new cycloartane glycosides, named aquilegiosides C–F, were isolated from the dried aerial parts of Aquilegia vulgaris. Their structures were determined by two-dimensional NMR spectroscopic analysis and chemical evidence.
Alkaloids
The genus Aquilegia contains flavonoids, phenolic acids, triterpenoid saponins (cycloartane glycosides), and alkaloids including magnoflorine and aporphine-type alkaloids. Labdane diterpene glycosides and megastigmane glycosides are also found. Chromatographic investigation of root alkaloids in a related species, Aquilegia formosa, revealed the presence of magnoflorine and berberine. A thin-layer chromatographic procedure also effectively separated berberine, palmatine, and jatrorrhizine.
The genus contains several alkaloids (including magnoflorine and berberine), triterpenoid saponins, flavonoids (quercetin, apigenin), and small amounts of cyanogenic glycosides (including triglochinin).
Cyanogenic Glycosides
Among Aquilegia species that have cyanophores — cells that produce a blue color — such as A. vulgaris, the cyanogenic glycoside compounds dhurrin and triglochinin have been observed. Cyanogenic constituents have also been noted as a chemical class found across the genus. These include cyanogenic constituents, cycloartane-type glycosides, butenolides, and unusual unsaturated fatty acids.
4. Established Mechanisms of Action (Genus-Level Evidence)
No mechanisms of action have been established specifically for A. viridiflora in the peer-reviewed literature, as targeted pharmacological studies on this species have not yet been published. The following mechanisms are documented for closely related Aquilegia species or for constituents that have been chemically identified across the genus.
Cycloartane Glycosides — Immunosuppressive Activity
Aquilegiosides C–F (isolated from A. vulgaris) suppressed the proliferation of lymphocytes in mouse allogeneic mixed lymphocyte reaction with IC50 values ranging from 3.7 × 10−5 to 2.2 × 10−4 M. The saponins of Aquilegia show immunosuppressive activity, and the alkaloids have cytotoxic activity.
Magnoflorine — Broad Pharmacological Properties
Magnoflorine is an important quaternary aporphine alkaloid isolated from some commonly used herbal medicines. In recent years it has received increasing attention due to its multiple pharmacological activities. A comprehensive review concluded that it possesses a wide spectrum of pharmacological properties, including anti-diabetic, anti-inflammatory, neuropsychopharmacological, immunomodulatory, hypotensive, antioxidant, and antifungal activities. Magnoflorine is the most widely distributed naturally occurring quaternary aporphine alkaloid and is found in numerous genera of flowering plant families including Ranunculaceae, Menispermaceae, and Magnoliaceae.
Pharmacokinetic studies have shown that magnoflorine has low bioavailability and high absorption and elimination rates.
Flavonoids — Antioxidant, Anti-inflammatory, and Hepatoprotective Actions
Orientin and chlorogenic acid protect plants from stress conditions and perform various biological activities including antioxidant, anti-aging, anti-inflammatory, anti-diabetic, antifungal, antibacterial, hepatoprotective, and anticancer functions. These compounds have been consistently detected in HPLC analyses of related Asian Aquilegia species.
Anti-diabetic Enzyme Inhibition
In vitro cell-free α-amylase and α-glucosidase inhibition assays in a concentration range of 25 to 400 μg/mL were performed to study the anti-diabetic potential of Aquilegia pubiflora leaf extracts. The ethanol extract showed greater efficiency against α-glucosidase (47.23 ± 0.41%) and α-amylase (55.38 ± 0.73%) inhibition compared to aqueous and methanol extracts.
Antimicrobial Activity
In antimicrobial studies on Aquilegia pubiflora, Klebsiella pneumoniae was found most susceptible with inhibition zones of 11.2–13.9 mm measured at 5 mg/mL across extract types. Aspergillus niger was the most susceptible fungal strain with the highest zone of inhibition of 15.4 mm recorded for the ethyl acetate extract at 5 mg/mL.
Antioxidant Activity
For Aquilegia pubiflora, the highest antioxidant activity values — 92.6 ± 1.8 μgAAE/mg (TAC), 89.2 ± 2.4 μgAAE/mg (TRP), 277.5 ± 2.9 μM (ABTS), and 289.9 ± 1.74 μM (FRAP) — were shown by the ethanol extract.
Cytotoxic / Anticancer Activity
Methanol, ethanol, and ethyl acetate extracts of Aquilegia pubiflora showed significant percentage cell inhibition (above 40%) against HepG2 (hepatocellular carcinoma) cells. These are in vitro findings and have not been replicated in animal models or humans for this species group.
Anti-inflammatory Activity
The highest anti-inflammatory activity among Aquilegia pubiflora extracts was shown by the ethanol extract — 52.5 ± 1.1% against sPLA2, 41.2 ± 0.8% against 15-LOX, followed by 38.5 ± 1.5% and 32.4 ± 0.8% against COX-1 and COX-2, respectively.
5. Scientific Evidence by Area of Use
It is essential to note at the outset that no clinical (human) studies have been identified for Aquilegia viridiflora specifically in any peer-reviewed database, including PubMed/MEDLINE. The scientific evidence base consists entirely of in vitro (cell-based) and, in some closely related species, limited in vivo (animal) data. All findings below are therefore categorized as preclinical only and are presented at the genus level unless otherwise stated.
5.1 Antimicrobial Activity
Evidence level: Preclinical (in vitro), weak to preliminary.
HPLC analysis demonstrated the presence of dvitexin, isovitexin, orientin, isoorientin, ferulic acid, sinapic acid, and chlorogenic acid in varied proportions in all plant extracts of Aquilegia pubiflora. These phytochemicals collectively underlie antimicrobial effects seen in in vitro models of related species. HPLC analysis confirmed the presence of vitexins, p-coumaric acid, and ferulic acid, phenols, and flavonoids, which are physiologically important against the treatment of pathogenic illness in humans. No clinical trials have been conducted.
5.2 Antioxidant Activity
Evidence level: Preclinical (in vitro), preliminary.
Antioxidant activity has been demonstrated in in vitro assays (DPPH, ABTS, FRAP, TAC) for related Asian Aquilegia species. Preliminary phytochemical screening of a related species confirmed the presence of alkaloids, flavonoids, phenols, tannins, saponins, cardiac glycosides, amino acids, and steroids, with the methanol extract exhibiting the richest phytochemical profile. Antioxidant activity was determined through the DPPH free radical scavenging assay, in which the methanol extract showed superior dose-dependent activity, achieving 69.74% inhibition at 1000 µg/mL and an IC50 value of approximately 441 µg/mL. No human trials exist.
5.3 Immunosuppressive / Immunomodulatory Activity
Evidence level: Preclinical (in vitro), preliminary.
Cycloartane-type glycosides named aquilegiosides — isolated from related species A. flabellata and A. vulgaris — have demonstrated immunosuppressive effects in laboratory models. Aquilegiosides C–F suppressed the proliferation of lymphocytes in mouse allogeneic mixed lymphocyte reaction with IC50 values ranging from 3.7 × 10−5 to 2.2 × 10−4 M. Whether equivalent glycosides are present in A. viridiflora has not been confirmed by published phytochemical study.
5.4 Anti-diabetic Activity
Evidence level: Preclinical (in vitro), preliminary.
Strong antimicrobial, protein kinase potency, and considerable α-glucosidase, α-amylase, and cytotoxic potential were exhibited by plant samples in studies of the related Himalayan columbine (A. pubiflora). These results are from cell-free enzyme assays only, and no animal or human studies have been published.
5.5 Cytotoxic / Anticancer Activity
Evidence level: Preclinical (in vitro), preliminary.
In vitro cytotoxic effects against HepG2 hepatocellular carcinoma cells have been reported for related Aquilegia species. Significant anti-Alzheimer, anti-inflammatory, anti-aging, and kinase inhibitory potential of plant samples from Aquilegia pubiflora has been noted, indicating the need for further detailed research to determine novel drugs. All evidence is at the cell culture stage with no clinical corroboration.
5.6 Anti-inflammatory Activity
Evidence level: Preclinical (in vitro), preliminary.
COX-1, COX-2, and 15-LOX inhibitory activity has been recorded in cell-free assays of related species. These preliminary findings do not constitute clinical evidence. Magnoflorine — a constituent of Aquilegia alkaloid fractions — has multiple findings published in the scientific literature mentioning its application in the treatment of a wide spectrum of diseases including inflammatory conditions, allergies, hypertension, osteoporosis, bacterial, viral and fungal infections, and some diseases such as cancer, obesity, diabetes, dementia, and depression. Again, these findings relate to the isolated constituent, and most are preclinical.
6. Body Systems and Health Areas of Association
Based on the available phytochemical and preclinical evidence at the genus level, the following body systems and health areas have been investigated or traditionally associated with Aquilegia species, including those closely related to A. viridiflora:
- Gastrointestinal system: The genus has been used in traditional medicine to treat digestive organ dysfunctions, including stomach ulcer and liver disease.
- Immune system: Cycloartane glycosides identified across the genus demonstrate in vitro immunosuppressive activity, suppressing lymphocyte proliferation in mixed lymphocyte reaction models.
- Cardiovascular system: Magnoflorine, identified in Aquilegia alkaloid fractions, possesses hypotensive activity among its pharmacological properties.
- Metabolic / endocrine system: In vitro α-glucosidase and α-amylase inhibitory activity has been demonstrated for related species, suggesting potential relevance to blood glucose regulation, though this remains undemonstrated in humans.
- Liver / hepatoprotective: Traditional medicinal applications of related species include treatment of hepatitis and jaundice.
- Skin and wound healing: Traditional applications across the genus include skin burns and wound healing.
- Respiratory and pulmonary: The genus has been used in treatment of lung disease in traditional systems.
- Musculoskeletal: Traditional use for rheumatic diseases is documented at the genus level.
- Neurological / cognitive: Aquilegia is also used in epilepsy and as a hypnotic in some traditional systems.
7. Dosage Forms and Reported Dosages
No standardized dosage recommendations for Aquilegia viridiflora appear in any peer-reviewed clinical study, pharmacopoeial monograph, or regulatory authority document (WHO, EMA, NIH/ODS, ESCOP, or German Commission E). The species is absent from all major pharmacopoeias and dietary supplement regulatory databases reviewed.
In the in vitro and phytochemical research literature for related species, the following concentrations were employed in experimental settings (not clinical doses):
- In vitro cell-free α-amylase and α-glucosidase inhibition assays were performed using concentration ranges of 25 to 400 μg/mL of leaf extracts of A. pubiflora.
- Antimicrobial studies assessed inhibition zones at a concentration of 5 mg/mL for aqueous, methanol, ethanol, and ethyl acetate extracts.
- Antioxidant DPPH assays used concentrations up to 1000 µg/mL for methanol extract, achieving 69.74% inhibition.
- For the isolated constituent magnoflorine, one animal study utilized intraperitoneal doses of 10 mg/kg, 20 mg/kg, and 50 mg/kg body weight administered to mice.
These figures are experimental parameters from laboratory settings and cannot be extrapolated to human supplemental dosages.
8. Safety Considerations
Cyanogenic Glycoside Toxicity
The most significant and well-documented safety concern for the Aquilegia genus is the presence of cyanogenic glycosides. Among Aquilegia species with cyanophores, the cyanogenic glycoside compounds dhurrin and triglochinin have been observed. Cyanogenic glycosides generally taste bitter and can be toxic to animals and humans. Ingestion of 20 g of fresh A. vulgaris leaves by a human was observed to cause convulsions, respiratory distress, and heart failure. A child who consumed 12 A. vulgaris flowers experienced weakness of the limbs, cyanosis, drowsiness, and miosis; all symptoms abated after three hours. Mature seeds and roots contain toxins that, if consumed, are perilous to human heart health.
The mechanism of toxicity is well understood at the biochemical level. Cyanogenic glycosides and their derivatives have amino acid-derived aglycones, which spontaneously degrade to release highly toxic hydrogen cyanide (HCN). Cyanide released from a cyanogenic glycoside in food by β-glucosidase — either of plant or gut microflora origin — follows the known cyanide metabolic pathway. Cyanide is detoxified by the enzyme rhodanese, forming thiocyanate, which is excreted in urine.
General Toxicity of the Genus
Despite often being toxic, columbines have been in use by humans as herbal remedies, perfume, and food. The toxicity is dose-dependent and varies across plant parts; the seeds and roots are considered more toxic than the aerial parts in some species.
Absence of Clinical Safety Data
No formal clinical safety studies, toxicological assessments, drug interaction studies, or regulatory safety evaluations have been published specifically for Aquilegia viridiflora as a dietary supplement or medicinal preparation. The species is not listed in any major pharmacopoeia or official herbal monograph. No regulatory body (EMA, WHO, EFSA, FDA, or NCCIH) has evaluated this species for use as a dietary supplement or herbal medicine. The Mongolian phytochemical research review explicitly noted that the phytochemical and biological activities of A. viridiflora in Mongolia have not yet been studied, underscoring that even foundational toxicological profiling is currently unavailable for this specific species.
Note on Evidence Gaps
Phytochemical studies of the Aquilegia L. genus have been started since the 1960s, yet only 57 natural compounds have been isolated from 16 plant species. A. viridiflora itself has not been among the species subjected to systematic phytochemical isolation studies in the published literature. All biological activity data referenced in this article comes from other species within the same genus. Until dedicated phytochemical and pharmacological studies are conducted on A. viridiflora itself, extrapolation from other Aquilegia species must be treated as hypothesis-generating only.
References
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