Dwarf Morning Glory (Evolvulus alsinoides L.): A Comprehensive Reference
1. Identity and Botanical Description
1.1 Nomenclature
Evolvulus alsinoides, commonly known as dwarf morning glory and slender dwarf morning glory, is a flowering plant from the family Convolvulaceae.
It was first described in 1753 by Carl Linnaeus as Convolvulus alsinoides; in 1762, he transferred it to the new genus, Evolvulus.
The Latin word evolvulus means "unrolled," referring to its non-twining habit; and alsinoides derives from the Greek alsiné, a name used by Theophrastus and Dioscorides, combined with -oides meaning "resembling."
Botanical synonyms include Evolvulus hirtus Lam., Evolvulus angustifolius Roxb., and Convolvulus alsinoides L. In Indian Ayurveda, it is commonly known as Visnukranta, Vishnukranti, or Shankhavel. Regional vernacular names include Shankhapushpi (Hindi/Sanskrit), Vishnukarandi (Tamil), Vishnukranta (Telugu), Vishnukranthi (Malayalam), Sankhavalli (Marathi), and Kalisankhavali (Gujarati). In Chinese traditional medicine, it is known as tu ding gui and has strong roots in traditional Chinese medicine (TCM).
In many classical texts and practices, the name "Shankhapushpi" is attributed to Convolvulus pluricaulis instead of Evolvulus alsinoides, and the two have been used interchangeably for the same medicinal purposes — as brain tonics and nervines — creating a classic case of botanical confusion in Ayurveda, but with aligned therapeutic intentions. Shankhapushpi is used largely or entirely for Convolvulus prostratus in northwestern India and for Evolvulus alsinoides farther south; in the south, the name is also commonly applied to Canscora decussata in the Gentianaceae. Clearly, the application of these names has been used differently by practitioners of Ayurveda, villagers, and scholars since at least the 1800s, probably before.
Vishnukraanti has been in use since the Vedic period in India, holding both a medicinal and spiritual importance in traditional Indian medicine. In addition to its use in traditional medicine, E. alsinoides is considered to have significant religious value; its Sanskrit name, Vishnukraanit, translates to "Vishnu's Step."
1.2 Botanical Description and Distribution
E. alsinoides is a herbaceous plant, annual or perennial, with numerous prostrate or ascending stems, slender, with appressed and spreading hairs. The leaves, petiolate or subsessile, are 0.7 to 2.5 cm long and 5 to 10 mm wide. The flowers are isolated or grouped in pauciflorous cymes, borne by filiform peduncles 2.5 to 3.5 cm long. The plant produces light blue flowers and small leaves; fruits are slender capsules. The fruit capsules are globose, 4-valved, and glabrous, with 1 to 4 tan or brown ovoid seeds.
E. alsinoides has a natural pantropical distribution encompassing tropical and warm-temperate regions of Australasia, Indomalaya, Polynesia, Sub-Saharan Africa, and the Americas. It grows throughout tropical and subtropical regions of the world, expanding through grasslands up to an elevation of 6,000 feet.
People in the Indian region often apply shankhapushpi and vishnukranti — two Sanskrit-based common names — to Evolvulus alsinoides. These are pre-European names applied to a medicinal American species transported into the area. The period of introduction is uncertain, but probably took place in the 1500s or 1600s. Examination of relationships of Evolvulus alsinoides, geographic distribution, its names in Asia, medical uses, and chemical and laboratory analysis indicates that the alien plant was adopted, given an ancient Indian name, and incorporated into some Old World pharmacopoeias.
Two varieties of Evolvulus alsinoides are distributed all over India: one is Evolvulus alsinoides (L.) L. var. angustifolius Torr. (slender dwarf morning glory), and another is Evolvulus alsinoides (L.) L. var. debilis (Kunth) van Ooststr. (slender dwarf morning-glory).
1.3 Common Forms and Preparations
Whole plants and leaves are the primary parts used for medicinal purposes. Preparations encountered in the literature include:
- Whole plant decoction, made along with cumin and milk, used to treat general debility, fever, syphilis, and loss of memory.
- Leaves are widely used in Africa and Asia to prepare tonics and febrifuges.
- In Niger, a decoction of the leaves is taken as a laxative or purgative.
- In Benin, powdered leaves mixed with shea butter are applied as a rub to treat stiffness of the limbs.
- In Kenya, the powdered leaves are applied to sores and bleeding wounds; in Tanzania, the pounded leaves are placed onto enlarged glands in the neck.
- The Suri people of Ethiopia apply crushed leaves to burns; Sukuma people of Tanzania burn the dried leaves in a pipe as a cure for leprosy. Leaves are also made into cigarettes, smoked in Nigeria and India against asthma and chronic bronchitis.
- In Niger, ash of the plant enters into a preparation rubbed on against skin infections, especially chickenpox. In Togo, an infusion of the plant is taken to treat menstrual problems.
- An infusion of roots, stalks, and leaves is used in Nigeria as a stomachic. In the Philippines, the plant is used to treat certain bowel irregularities and as a vermifuge and febrifuge.
- Modern supplement forms include standardized ethanolic, methanolic, and aqueous extracts, as well as encapsulated whole-plant powder, which appear in the scientific literature as the vehicles for pharmacological investigation.
2. Traditional and Historical Use
2.1 Ayurveda (India)
Vishnukraanti has been in use since the Vedic period in India, holding both medicinal and spiritual importance in traditional Indian medicine. In Ayurvedic medicine, Vishnukraanti is used to treat many mental and cognitive disorders as it is considered a nootropic.
In Ayurvedic characterization, the plant's taste (Rasa) is described as pungent (Katu) and bitter (Tikta), with a pungent taste after digestion (Vipaka). The plant is described as cold in potency (Sheeta Veerya) and is considered to possess Rasayana (anti-aging and rejuvenating) and Medhya (memory-enhancing) properties. Ayurvedic texts describe its use for conditions such as Apasmara (epilepsy), Unmada (mania), Anidra (insomnia), Bhrama (vertigo), and Visha (poisoning).
In Ayurvedic medicine, the whole plant is used in the treatment of neurodegenerative diseases as a brain tonic, in amnesia, asthma, and epilepsy, and as a hepatoprotective. According to Ayurveda, Vishnukranthi is a key component of Medhya Rasyana (nervine tonic) herbs, which are believed to benefit synaptic plasticity and neural regeneration.
Anticonvulsant, anthelmintic, sedative, memory-enhancement, antiepileptic, and anti-anxiety applications are among the traditional uses. The plant is also utilized for epilepsy, uterine bleeding, nervous debility, and insanity, as well as a brain and memory tonic, and for antifungal, antibacterial, antiulcer, and anti-asthmatic properties.
2.2 Unani Medicine
In Unani literature, E. alsinoides is considered a memory enhancer and has been used as a rejuvenator, anti-aging agent, stimulant, and sedative. In Unani medicine it has been used as a brain tonic, anticonvulsant, nervine tonic, aphrodisiac, anti-inflammatory, antitussive, eye tonic, and blood purifier. According to Unani medicine, notable medicinal applications include the treatment of flatulence, haemorrhoids, diabetes, frequency of micturition, burning micturition, gonorrhea, syphilis, and other renal and bladder diseases.
2.3 Traditional Chinese Medicine
Known as tu ding gui in Chinese, E. alsinoides is a medicinal plant with strong roots in traditional Chinese medicine (TCM), with rich secondary metabolite compositions, as well as therapeutic and medical properties, though it has received comparatively limited research in that tradition.
2.4 Africa and Southeast Asia
Certain ethnic groups in India, Africa, and the Philippines utilize the plant to treat fever, cough, cold, venereal disorders, azoospermia, adenitis, and depression. In Sri Lanka, it is known as "Nil Vishnukranthi" in Sinhala and is used in a variety of traditional preparations. Burning the leaves produces a fragrant smoke used as incense; in Kerala, India, the dwarf morning glory is also revered as a sacred plant.
3. Key Constituents and Phytochemistry
3.1 Confirmed Phytochemical Classes
E. alsinoides contains an abundance of secondary metabolites, including triterpenoids, flavonoids, terpenoids, alkaloids, and essential oils, which contribute to its anti-inflammatory, antimicrobial, antioxidant, antiproliferative, and immunomodulatory properties.
E. alsinoides contains various secondary metabolites such as glycosides, alkaloids, polyphenols, amino acids and proteins, saponins, volatile oil, flavonoids, and tannins. Early phytochemical studies resulted in the isolation and identification of chemical constituents such as triacontane, pentatriacontane, and β-sitosterol in the petroleum ether extract, and two alkaloids betaine and shankpushpin, along with evolvine.
3.2 Specifically Isolated Compounds
Four substances isolated from the ethanol extract of E. alsinoides by means of polyamide and silica-gel chromatography have been identified and their molecular structures determined using NMR analyses: scopoletin, umbelliferone, scopolin, and 2-methyl-1,2,3,4-butanetetrol.
Several studies confirmed the presence of betaine, tannins, carbohydrates, proteins, amino acids, volatile oil, mineral substances (KCl), pentatriacontane, triacontane, β-sitosterol, glycoflavone, 4-methoxyvitexin, and phenolic acids (p-hydroxybenzoic, vanillic, protocatechuic, and gentisic acid) in E. alsinoides.
This medicinal herb is known to possess numerous bioactive compounds including alkaloids (such as convolamine), flavonoids (like kaempferol), phenolics (including β-sitosterol and ceryl alcohol), and the bitter compound scopoletin, which has been identified as the principal active phytoconstituent.
Compounds identified in whole plant extracts include long-chain alkanes, butanetriol, esters of ferulic acid and caffeoylquinic acid, caffeic acid, coumarin derivatives scopoletin, scopoline, and umbelliferone, and several kaempferol and sitosterol derivatives. Flavonoid glycosides have been designated evolvulus C–E.
The alkaloid evolvine has also been identified from the whole plant, though its precise chemical structure was not fully characterized in earlier studies.
3.3 GC-MS Analysis of Methanolic Extract
From the methanolic extract analyzed by GC-MS, the prevailing compounds identified were hexadecanoic acid methyl ester, benzoic acid, n-hexadecanoic acid, D-allose, and cytidine. The methanolic extract of E. alsinoides yielded ten compounds in total by GC-MS analysis.
4. Mechanisms of Action
4.1 Acetylcholinesterase (AChE) Inhibition
Scopoletin, identified as the principal active phytoconstituent in the plant, plays a pivotal role in its bio-potency. It is credited with antioxidant properties and memory enhancement; furthermore, scopoletin exhibited a mitigating effect on amnesia in animals induced with scopolamine, showcasing its multifaceted neuroprotective potential.
The acetylcholinesterase inhibitory activity of scopolin and scopoletin was discovered by virtual screening of natural products (Rollinger et al., 2004, J Med Chem 47: 6248–6254). The neuroprotective effect of plant extracts was attributed to inhibition of AChE activity and improved spatial memory formation.
Research published in BMC Complementary Medicine and Therapies (2020) reported the first findings on the inhibition effects of Evolvulus alsinoides extracts against α-amylase, α-glucosidase, and acetylcholinesterase.
4.2 Antioxidant and Neuroprotective Mechanisms
The key mechanisms include neuroprotection; the plant's bioactive components, including scopoletin and evolvine, have antioxidant qualities that reduce oxidative stress, which is a key contributor to neurodegenerative illnesses.
Caffeoylquinic acid derivatives and caffeic acid have been shown to exert antistress activity, normalizing hyperglycemia, plasma corticosterone levels, and adrenal hypertrophy in experimental models.
4.3 Alkaloid-Mediated Neuropharmacology
Alkaloids such as evolvine and betaine are considered central to the plant's neuropharmacological effects. Their primary actions are nootropic and anxiolytic, enhancing memory and learning and reducing anxiety, putatively through modulation of neurotransmitters like acetylcholine. Scopoletin, a coumarin compound, has documented sedative, anxiolytic, and antipyretic properties and contributes to the plant's calming effect on the central nervous system.
The neuropharmacologic effects primarily result from the cumulative impact of these phytochemicals. Existing literature struggles to elucidate the precise mechanisms governing the neuroactive functions of these phytochemicals; a comprehensive understanding of the underlying molecular mechanisms necessitates rigorous experimental exploration.
4.4 Antidiabetic Mechanisms
Administration of Evolvulus alsinoides to streptozotocin-induced diabetic rats improved antioxidant activity and remodeled the structure of the pancreas, attributed to the presence of secondary metabolites including phenols, flavonoids, alkaloids, steroids, terpenoids, and glycosides in the ethanolic extract. The plant extract effectively reduced oxidative stress induced by streptozotocin and potentially increased insulin levels.
5. Scientific Evidence by Area of Use
5.1 Cognitive Enhancement and Nootropic Activity
This is the most extensively investigated domain and the primary reason the plant is used in Ayurvedic and related systems. All available human-relevant evidence is preclinical (animal-based); no prospective randomized controlled trials in humans have been published.
Key animal study (Siripurapu et al., 2005): E. alsinoides (EA) is well known for its memory enhancement, antiepileptic, and immunomodulatory properties in Ayurveda. Researchers evaluated the crude ethanolic extract of EA for its adaptogenic and memory-enhancing properties in rodents. Adaptogenic activity was assessed in rats subjected to acute and chronic unpredictable stress. Male Sprague-Dawley rats weighing 180–200 g were immobilized for 150 minutes in the acute stress model; in the chronic unpredictable stress model, rats were subjected to different types of stressors daily for 7 days.
Dose-response study (Phytotherapy Research, 2009): In the Ayurvedic system of medicine, the whole herb of 'Shankhpushpi' has been employed clinically for centuries for its memory potentiating, anxiolytic, and tranquilizing properties. This study investigated the effects of Evolvulus alsinoides on learning and memory in rodents, using Cook and Weidley's pole climbing apparatus, passive avoidance paradigms, and active avoidance tests. The ethanol extract of EA and its ethyl acetate and aqueous fractions were evaluated at two doses (100 and 200 mg/kg p.o.) administered in separate groups of animals. Both doses of all extracts significantly improved learning and memory in rats. These doses also significantly reversed amnesia induced by scopolamine (0.3 mg/kg i.p.). Nootropic activity was compared using piracetam as the standard. EA also exhibited potent memory enhancing effects in the step-down and shuttle-box avoidance paradigms.
Scopolamine amnesia model (2024, PMC): The nootropic activity of methanolic extract from Evolvulus alsinoides was investigated in mice with scopolamine-induced amnesia. Healthy male Swiss albino mice ranging between 25 and 30 g were used. Testing employed the elevated plus maze test and the passive avoidance test. The findings of this study suggest that Evolvulus alsinoides may be a promising candidate for the development of new treatments for memory impairment and other cognitive disorders. It should be noted that more data is needed to confirm the safety and efficacy of Evolvulus alsinoides in humans and to investigate its long-term effects.
Comparative neuroprotection study (2019, PMC): A comparative study evaluated the nootropic and neuroprotective potentials of two medicinal plant species. For neuroprotective activity, behavioral models (elevated plus maze and Morris water maze), in vivo antioxidants (superoxide dismutase, catalase, lipid peroxidation, and reduced glutathione), inflammatory markers (IL-1β, IL-6, and TNF-α), and acetylcholinesterase (AChE) assessment procedures were followed at different dosages of 250 and 500 mg/kg of Evolvulus alsinoides and Centella asiatica ethanolic extracts. Histopathological analysis of brain, heart, liver, and kidney was performed at the end of the study. Both herbs showed significant neuroprotective activity, but E. alsinoides demonstrated superior performance in inhibiting acetylcholinesterase activity.
Evidence strength: Pre-clinical (in vivo and in vitro) investigations have demonstrated anti-amnesic, antistress (adaptogenic), antimicrobial, and gastroprotective activity. Although clinical studies are warranted for potential use of E. alsinoides in treating dementia, pre-clinical research has justified the ancient claim of 'brain-tonic.' Use in traditional medicine of East Asia for its purported psychotropic and nootropic properties is acknowledged, though such claims are not medically verified. Overall, the evidence is preliminary and confined to in vitro and animal models; controlled human trials are absent.
5.2 Adaptogenic and Anti-Stress Activity
The crude ethanol extract of the whole plant has been characterized as adaptogenic and antiamnesic in animal models. Caffeoylquinic acid derivatives and caffeic acid from the plant were specifically shown to exert antistress activity, normalizing hyperglycemia, plasma corticosterone levels, and adrenal hypertrophy in preclinical models.
Research from the Central Drug Research Institute, Lucknow (Siripurapu et al., 2005, Pharmacol Biochem Behav 81: 424–432) remains the most-cited preclinical investigation of adaptogenic properties, evaluating both acute and chronic stress paradigms in rodents. Evidence strength: animal models only; no human trials.
5.3 Anxiolytic Activity
The plant is suggested to have nootropic, anti-stress, anxiolytic, antidepressant, anticonvulsant, tranquilizing, and sedative properties. These characterizations rest on preclinical studies using elevated plus maze and related behavioral paradigms in rodents. Nahata, Patil, and Dixit published a rodent study on anxiolytic activity of Evolvulus alsinoides and Convolvulus pluricaulis. No human clinical trials for anxiolytic indications have been published. Evidence strength: weak (preclinical only).
5.4 Antidiabetic Activity
Histopathological studies showed normal histology of the pancreas after treatment with plant extract and glibenclamide in streptozotocin-induced diabetic rats. The administration of Evolvulus alsinoides to these rats improved antioxidant activity and remodeled the structure of the pancreas, due to the presence of secondary metabolites. The plant extract effectively reduced oxidative stress induced by streptozotocin and potentially increased the insulin level; hence, it may be useful in the management of diabetes mellitus.
In vitro evidence from BMC Complementary Medicine and Therapies (2020) demonstrated inhibitory activity of leaf extracts against α-amylase and α-glucosidase. Ethanolic extract treatment reduced glycoprotein levels in diabetic rat models over 45 days. Evidence strength: limited to in vitro and animal models; no human data.
5.5 Antimicrobial Activity
Antimicrobial properties of E. alsinoides are observed with methanolic extracts. Organisms tested include Candida albicans, Aspergillus niger, Staphylococcus aureus, Listeria monocytogenes, Yersinia enterocolitica, Vibrio cholerae, Bacillus megaterium, Klebsiella pneumoniae, Salmonella typhi, and Bacillus subtilis. Inhibitory values for each microorganism were determined at three distinct concentrations: 50, 100, and 150 µg/mL.
High antibacterial activity was observed against Klebsiella pneumoniae with a 38 mm clearance zone in disc diffusion assay. Ethanolic leaf extracts showed moderate antibacterial and antifungal properties and also activity against Trypanosoma brucei rhodesiense. Evidence strength: in vitro only; clinical translation unknown.
5.6 Anti-Inflammatory and Antipyretic Activity
A published study scientifically validated the ancient claim that the whole plant of Evolvulus alsinoides has anti-inflammatory, antipyretic, and antidiarrhoeal activities. These findings derive from preclinical animal experiments. Evidence strength: preclinical; no human trials identified.
5.7 Antiulcer Activity
An ethanol extract of the whole plant showed anti-ulcer and anticatatonic activity in rats. In vivo, the extract significantly reduced the incidence of ulcers in aspirin-treated rats and reduced the incidence of catatonia in chlorpromazine-treated rats. Evidence strength: animal model only.
5.8 Hepatoprotective Activity
The plant has a variety of pharmacological qualities, including those that aid hepatoprotection. Hepatoprotective properties are listed consistently in review literature as traditional and partially validated preclinical properties, but no dedicated human hepatoprotection trials have been published for this species. Evidence strength: preclinical.
5.9 Antioxidant Activity
Antioxidant activity of the isolated substances (scopoletin, umbelliferone, scopolin, 2-methyl-1,2,3,4-butanetetrol) was measured by DPPH assay using the SIA method. Antioxidant activity and total phenolic content of prepared fractions were also described. The water extract of the leaf contained 45.08 ± 0.02 mg GAE/g tannins, 49.30 ± 0.07 mg GAE/g phenolics, and 211.21 ± 0.02 mg QE/g flavonoids; antioxidant activity was supported by IC₅₀ 52.43 ± 0.2 µg/mL by DPPH assay. Evidence strength: in vitro; no clinical antioxidant trials.
6. Body Systems and Health Areas
Based on the converging evidence of traditional use and preclinical investigation, the following body systems and health areas are associated with Evolvulus alsinoides:
- Central Nervous System: E. alsinoides has demonstrated scientific potential in central nervous system depression, anxiolytic, tranquilizing, antidepressant, antistress, neuroprotective, antiamnesic, antioxidant, and anticatatonic activities.
- Endocrine / Metabolic: Anti-diabetic and hypolipidemic activities supported by animal studies, including effects on pancreatic insulin secretion and glycoprotein levels.
- Immune System: A review study verified that Evolvulus alsinoides acted as an anthelmintic, antibacterial, antioxidant, and immunomodulatory agent with potential use as a gastroprotective.
- Gastrointestinal System: Anti-ulcer, gastroprotective, antidiarrhoeal, and stomachic uses reported in both traditional medicine and preclinical studies.
- Respiratory System: All parts of the plant are used in Ayurvedic medicine to treat cough, cold, and fever.
- Cardiovascular: Cardioprotective and antihypertensive properties are reported in review literature, though the evidence base is limited to in vitro and animal models.
- Reproductive: Traditional uses include addressing azoospermia, uterine bleeding, and as an agent to promote conception.
7. Dosage Forms and Reported Study Doses
No regulatory-approved or standardized human dose has been established for Evolvulus alsinoides. The following dosages are reported only as they appear in the cited scientific literature:
- In the rodent learning and memory study (Phytotherapy Research), two doses — 100 mg/kg p.o. and 200 mg/kg p.o. — of the ethanol extract and its fractions were administered in separate animal groups.
- In the comparative neuroprotective activity study, dosages of 250 mg/kg and 500 mg/kg of ethanolic extracts of both Evolvulus alsinoides and Centella asiatica were used.
- For LD₅₀ evaluation, a single dose of ethanolic extracts of E. alsinoides was orally administered to mice at doses of 200, 400, 800, 1600, and 2000 mg/kg.
- For acute toxicity evaluation, a single dose of the extract was orally administered to mice at doses of 300, 600, 1200, and 2000 mg/kg with observation for 14 days. In the sub-acute study, the extracts were orally administered to mice for 28 days at doses of 300, 600, 1200, and 2000 mg/kg.
- Antimicrobial inhibitory values were determined at three distinct concentrations: 50, 100, and 150 µg/mL.
All doses above are derived from preclinical (animal) studies and do not translate directly to human dosing recommendations. No human clinical dose-finding studies have been published for this plant.
8. Safety Considerations and Interactions
8.1 Acute and Sub-Acute Toxicity (Animal Data)
In an in vivo toxicity study conducted according to OECD guidelines, E. alsinoides and Centella asiatica extracts at different doses caused no mortality in acute and sub-acute toxicity studies. Additionally, histopathology of kidney, liver, heart, and brain showed no alterations in tissue morphology.
In mice, the extract showed central nervous system depressant activity with an ED₅₀ of 450 mg/kg. In tests with albino mice, moderate doses (200 mg/kg) of the alcoholic extract caused drowsiness, stupor, and reduced mobility; higher doses tested were neither lethal nor toxic.
Large doses of E. alsinoides may cause drowsiness and lowered mobility, but no toxic effect on the body has been reported.
8.2 Potential Drug Interactions
The plant should not be used in large quantities in conjunction with drugs that have a sedative effect, given its own demonstrated CNS depressant activity at higher doses. People on sedative medications should exercise caution due to potential additive CNS depressant effects.
8.3 Special Populations
Based on available traditional and preclinical information, the plant is not recommended for use by pregnant or nursing women. The absence of clinical safety studies in humans means that data on pediatric populations, pregnant or lactating women, or individuals with pre-existing organ disease are absent.
8.4 Botanical Confusion and Adulteration Risk
In many classical texts and practices, the name "Shankhapushpi" is attributed to Convolvulus pluricaulis instead of Evolvulus alsinoides, creating a classic case of botanical confusion in Ayurveda. This substitution, documented historically across multiple regions, represents a significant quality-control concern: preparations marketed as Shankhapushpi may contain one or more of several different species. The application of these names has been used differently by practitioners of Ayurveda, villagers, and scholars since at least the 1800s, probably before.
8.5 Evidence Limitations and Research Gaps
Thorough clinical trials and translational research are required to bridge the gap between conventional knowledge and current medical uses. Existing literature struggles to elucidate the precise mechanisms governing the neuroactive functions of the phytochemicals in this plant; a comprehensive understanding of the underlying molecular mechanisms necessitates rigorous experimental exploration.
The existing findings suggest that Evolvulus alsinoides may be a promising candidate for the development of new treatments for memory impairment and other cognitive disorders; however, more data is needed to confirm the safety and efficacy of Evolvulus alsinoides in humans and to investigate its long-term effects.
References
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