Homalomena

Homalomena: A Comprehensive Reference on Botany, Traditional Use, Phytochemistry, and Pharmacological Evidence

1. Identity and Botanical Classification

Homalomena is a genus of plants in the family Araceae. It was formally described by H.W. Schott and S.L. Endlicher in Meletemata Botanica (1832), and belongs to the kingdom Plantae, phylum Tracheophyta, class Liliopsida, order Alismatales, and family Araceae. As of September 2024, Plants of the World Online accepted approximately 160 species within the genus.

Homalomena species are primarily found in southern Asia and the southwestern Pacific, but a few species are known to be indigenous to Latin America. Many Homalomena have a strong smell of anise, and the genus name derives apparently from a mistranslated Malayan vernacular name, translated as homalos (flat) and mene (moon).

The plants of this genus are clump-forming evergreen perennials with mainly heart-shaped or arrowhead-shaped leaves; the flowers are tiny and without petals, enclosed in a usually greenish spathe hidden by the leaves.

The genus encompasses a number of synonyms recognized in botanical databases. Accepted synonyms include Chamaecladon Miq., Curmeria Linden & André, Cyrtocladon Griff., Diandriella Engl., Homalonema Endl., and Spirospatha Raf.

Medicinally and Commercially Significant Species

Although the genus is large, research and traditional medicine have focused on a small number of species. The most studied include:

• Homalomena occulta (Lour.) Schott — officially listed in the Chinese Pharmacopoeia, named Qian-nian-jian, and found in the tropical and sub-tropical areas of Asia and America. Its synonyms include Calla occulta Lour., Spirospatha occulta (Lour.) Raf., and Zantedeschia occulta (Lour.) Spreng.
• Homalomena aromatica (Spreng.) Schott — a valuable medicinal aromatic plant having wide range of applications in ethnobotany, pharmacology, perfumery, and the flavor industry. Its synonyms include Calla aromatica (Spreng.) Roxb. and Zantedeschia aromatica Spreng. It is known locally in India as Sugandhmantri.
• Homalomena rubescens (Roxb.) Kunth — synonyms include Calla rubescens Roxb. and Chamaecladon rubens W. Bull. This species is widely cultivated ornamentally as "Emerald Gem."
• Homalomena pendula (Blume) Bakh.f. — a Vietnamese species investigated for sesquiterpenoids and acetylcholinesterase inhibitory activity.
• Homalomena cochinchinensis — investigated for its essential oil composition and anti-inflammatory properties.
• Homalomena sagittifolia — studied for phytol content and cyclooxygenase inhibitory activity.

Common Preparations and Commercial Forms

The rhizomes of Homalomena are used in herbal preparations; they are dug up in the spring or autumn, cleaned, dried in the sun, then cut into slices for use. Sliced, dried Homalomena rhizome can be found at some Asian markets and specialty stores, and pills and powders are also available. The essential oil is extracted from the rhizomes and aerial parts, and the residual material remaining after extracting the essential oil finds extensive use in the production of incense (dhup).

2. Traditional and Historical Use

Traditional Chinese Medicine (TCM)

The Chinese name for Homalomena is qian nian jian, which means "thousand years of health." The rhizomes of Homalomena occulta are called Qian-nian-jian in Traditional Chinese Medicine and are widely consumed in China owing to their health benefits for the treatment of rheumatoid arthritis and for strengthening tendons and bones. It is used as a folk remedy for the treatment of stomach disorders, rheumatoid arthritis, muscle soreness, and quadriplegia, as well as an anti-inflammatory and tonic agent.

In traditional Chinese medicine, Homalomena has bitter, pungent, and warm properties, and is associated with the Liver and Kidney meridians. Its main functions are to dispel wind and dampness, and to strengthen the tendons and bones; it is used to treat pain and weakness in the lower back and knees, along with numbness in the lower extremities.

In TCM combination formulas, Homalomena rhizome is indicated for wind-damp obstruction syndrome manifested as cold sensation and pain in the lower back and knees and spasms or numbness of the lower limbs; it has traditionally been soaked in wine together with Tiger's bone (Hugu), Cyathula root (Niuxi), and Wolfberry fruit (Gouqizi).

Homalomena occulta is mostly found in the Guangxi and Yunnan Provinces in China and is used as an anti-inflammatory and analgesic; it can be used for the treatment of cold and wet arthralgia, cold pain of the waist and knee, and numbness of the lower extremity contracture.

South and Southeast Asian Traditional Medicine

Homalomena aromatica is a highly demanded medicinal plant used under the name Sugandhmantri for the cure of rheumatoid arthritis, ulcer, and related disorders, as well as in perfumery for the preparation of oriental perfumes. It is widely distributed in northeastern India — including Arunachal Pradesh, Assam, Manipur, Meghalaya, Mizoram, Nagaland, and Tripura.

Traditionally, various parts of H. aromatica — such as leaves and rhizomes — were applied to treat joint pain, skin diseases, colds, asthma, diarrhea, and jaundice. Whole herb extracts are used to address muscle weakness, rheumatism, and allergies, purify the blood, treat deafness, and promote wound healing, especially in postpartum women.

The boiled petiole is used as a vegetable, the rhizome as an aromatic stimulant, powdered rhizome as gunpowder, burnt smoke of the rhizome as a mosquito repellent, and infusion of the plant is used for easy labor. The juice of the whole plant is used as a lotion in skin diseases. The Mizo-tribal communities of Northeast India are cited as one population that has made particular use of these preparations.

The plant is also used by tribal inhabitants in the hilly areas of the eastern regions of India (Sikkim, Arunachal) and Bhutan as an anti-inflammatory, antidepressant, analgesic, sedative, antispasmodic, antiseptic, and pain-killing agent.

H. occulta and H. aromatica, two abundant species of the genus, have been used to treat many diseases including stomach complaints, skin infections, and as a mosquito repellent, and for asthma and liver diseases.

Perfumery and Flavor Industry

Homalomena aromatica (Spreng.) Schott, or "Sugandhmantri," is known to biosynthesize a valuable essential oil that finds several applications in perfumery. The high linalool content of the rhizome essential oil has made it commercially significant in the fragrance trade of India, with the plant widely traded from Manipur to markets in Kanpur, Kannauj, Kolkata, and elsewhere.

3. Key Constituents and Active Compounds

Essential Oil of H. aromatica

Homalomena aromatica rhizomes are a rich source of essential oils; isolation and analysis using gas chromatography-mass spectrometry (GC-MS) has been extensively performed. HPLC and GC-MS analysis of rhizome oil showed the presence of 39 components accounting for 96.9% of the total oil; the major component was linalool (62.1%), followed by terpinen-4-ol (17.2%), α-terpineol (2.4%), γ-terpinene (1.9%), α-cadinol (1.5%), geraniol (1.4%), nerol (1.4%), α-terpinene (1.0%), spatulenol (1.0%), and T-cadinol (1.0%).

A more recent study identified 55 constituents. Among these, T-muurolol (5.32%), viridiflorol (3.69%), α-selinene (2.19%), M-cymene (2.19%), and γ-Muurolene (1.81%) were identified and reported for the first time; other major components were linalool (62.5%), terpene-4-ol (7.08%), δ-cadinene (5.57%), α-cadinol (3.71%), and spatulenol (1.81%). The oil was found to be mainly composed of monoterpenes, monoterpenols, sesquiterpenes, sesquiterpenols, esters, and oxides.

Across multiple studies, linalool is consistently the dominant component: linalool was reported as the major constituent of many Homalomena essential oils, including H. aromatica rhizome (62.5%), H. aromatica root (58.3%), H. occulta rhizome (36.9%), and H. sagittifolia rhizome.

A comprehensive study using gas chromatography, enantioselective gas chromatography, mass spectrometry, and NMR experiments identified (R)-(-)-linalool as the single predominant enantiomer and characterized a new compound, homalomenol D (HMD). A total of over 49 compounds (covering 82.94–92.70% of the oil) were identified, with linalool (40.2–54.4%) as the major constituent, followed by terpinen-4-ol (3.7–5.3%), δ-cadinene (2.4–5.2%), τ-muurolol (2.4–4.6%), and α-cadinol (6.2–7.3%).

Sesquiterpenoids of H. occulta

Previous phytochemical studies on H. occulta have resulted in the isolation of a series of sesquiterpenoids, triterpenoids, triterpenoid saponins, flavonoids, lignans, and essential oils.

A phytochemical investigation yielded 19 sesquiterpenoids (1–19) with various carbocyclic skeletons, including isodaucane, guaiane, eudesmane, oppositane, and aromadendrane types. The structures of new compounds, Homalomenins A–E (1–5), were determined by diverse spectroscopic data; compound 1 possessed a rare sesquiterpenoid skeleton and compound 5 represented the first example of a 1,4-oxa-oppositane sesquiterpenoid.

Chemical investigation of the rhizomes of H. occulta led to the isolation and identification of two sesquiterpenoids (6,7), one daucane ester (8), together with five known sesquiterpenoids: oplodiol, oplopanone, homalomenol C, bullatantriol, and 1β,4β,7α-trihydroxyeudesmane.

Aromatic Compounds of H. occulta

Three new aromatic compounds were isolated from the 95% EtOH extract of Homalomena occulta, identified as 1-(3′,4′-methylenedioxy-phenyl)-10-(3″-hydroxyphenyl)-decane (1), 1-(3′,4′-methylenedioxy-phenyl)-12-(3″-hydroxyphenyl)-dodecane (2), and 1-(3′,4′-methylenedioxy-phenyl)-12-(3″-hydroxyphenyl)-6Z-dodecylene (3), along with six known compounds.

Sesquiterpenoids of H. pendula

Sixteen sesquiterpenoids, including two new ones — homalolides A and B — were first isolated from the methanolic extract of the rhizomes of Homalomena pendula collected in Vietnam.

Non-Volatile Constituents of H. aromatica

Besides essential oils, H. aromatica also contains alkaloids, saponins, cardioactive glycosides, polyphenolics, fixed oils, oleic acid, undecylenic acid, epiandrosterone, palmitic acid, and linoleic acid. Quantitative analysis of the methanolic leaf extract has displayed higher contents of phenolics and flavonoids (147.71 mg gallic acid equivalent/g and 66.65 mg quercetin equivalent/g dried extract, respectively).

4. Scientific Evidence by Area of Use

4.1 Anti-Inflammatory Activity

Evidence level: Preliminary — in vitro and in silico only; no published human clinical trials identified.

Sesquiterpenoids isolated from the rhizomes of H. occulta were evaluated for their inhibitory effects on COX-2 mRNA, COX-2 protein expression, and prostaglandin E2 (PGE2) production in RAW264.7 cells. Compounds 5, 18, and 19 (sesquiterpenoids of various skeletal types) showed potent anti-inflammatory activity in this cell-based assay.

All sixteen sesquiterpenoid isolates from the rhizomes of H. pendula were tested for their inhibitory activities against lipopolysaccharide-induced nitric oxide production in the RAW 264.7 macrophage cell line; compounds 1, 3, 6–8, and 10–12 displayed moderate inhibitory effect on NO production with IC50 values ranging from 35.41 to 64.06 μM.

In one study assessing anti-inflammatory, anti-diabetic, tyrosinase inhibitory, acetylcholinesterase (AChE), antimicrobial, and genotoxic efficacies of H. aromatica rhizome essential oil (HAEO), GC/MS profiling yielded an oil with linalool as the major compound (76.29%); the anti-inflammatory activity showed IC50 values of 19.59 µL/mL for a protease inhibitor assay and 32.16 µL/mL for an albumin denaturation assay.

In cell-based experiments, treatment with H. aromatica essential oil showed a significant decrease in pro-inflammatory cytokines (TNF-α and IL-6) without significant toxic effect in HaCaT cells, and a relaxation response of isolated mouse bronchial tissue precontracted with carbachol.

All available evidence is from in vitro cell-based models and in silico approaches. No randomized controlled trials or clinical studies in human subjects have been published for any Homalomena species' anti-inflammatory effects.

4.2 Musculoskeletal and Bone Health

Evidence level: Preliminary — in vitro only; no human clinical trials identified.

The chloroform extract of H. occulta and compounds 1–7 were tested in vitro for their activities in stimulating osteoblast (OB) proliferation, differentiation, and mineralization; compounds 1–4 had a stimulative effect on significantly proliferating and differentiating culture osteoblasts, while the chloroform extract and compound 1 significantly stimulated mineralization of cultured osteoblasts in vitro.

Two new sesquiterpenoids — 4,6,7-trihydroxy-isodaucane and (–)1β,4β,6α-trihydroxy-eudesmane — both stimulated the proliferation of osteoblasts in a dose-dependent manner.

In a more recent study, seventeen sesquiterpenoids were isolated from the aerial part of Homalomena occulta; two new compounds, Homoccusions A (1) and B (2), were characterized, and the anti-osteoclastogenic effects of all compounds were studied — compounds 1–5 showed strong inhibition with an osteoclastogenesis inhibitory ratio of over 90% at 10 μM.

These in vitro findings are mechanistically consistent with the TCM use of the plant for bone strengthening. However, they have not been translated into clinical studies, and no human trial data exist. The in vitro conditions do not necessarily predict efficacy in vivo.

4.3 Antimicrobial and Antifungal Activity

Evidence level: Preliminary — in vitro only; no human clinical trials identified.

H. aromatica rhizome essential oil showed high antimicrobial activity against Trichophyton rubrum, Trichophyton mentagrophytes, Microsporum fulvum, Microsporum gypseum, Trichosporon beigelii, and Candida albicans.

The oil also showed good antifungal activity against Curvularia pallescens, Aspergillus niger, and Fusarium graminearum, as well as insecticidal behavior against white termite (Odontotermes obesus).

GC-MS analyses of H. aromatica essential oil confirmed linalool as the major compound; the essential oil and purified linalool showed antibacterial activity against multidrug-resistant (MDR) clinical bacteria isolates including CRE (carbapenem-resistant Enterobacteriaceae) and MRSA (methicillin-resistant Staphylococcus aureus), and also exhibited synergistic effects in combination with antibiotics (ceftriaxone, meropenem) against MRSA and CRE.

The minimum cidal concentration (MCC) of H. aromatica oil against some common human pathogenic fungi was found to be 1.2 to 1.8 µl/ml, which contains heavy inoculum density.

Antimicrobial activities of three new eudesmane-type sesquiterpenoids and eight known constituents isolated from the aerial parts of H. occulta against six different bacterial strains were reported using an agar-diffusion assay. All reported antimicrobial data are in vitro; no clinical trials have evaluated these effects in humans.

4.4 Antioxidant Activity

Evidence level: Preliminary — in vitro only.

A study explored in vitro antioxidant and thrombolytic activities of a methanolic extract of H. aromatica (MEHA) leaves; antioxidant activity was assessed by DPPH free radical scavenging assay, and the IC50 value of the extract against DPPH was 199.51 μg/mL. The extract also showed a significant clot lysis (33.31%) activity in the thrombolytic assay.

4.5 Neuropharmacological Activity / Acetylcholinesterase Inhibition

Evidence level: Preliminary — in vitro and in silico only; no human studies identified.

A study aimed to evaluate the AChE inhibitory activities of sesquiterpenoids from the rhizomes of Homalomena pendula; among fourteen isolates, teucmosin showed significant AChE inhibition with an IC50 value of 4.53 ± 0.39 μM, which was comparable to berberine (positive control, IC50 = 3.78 ± 0.51 μM), and in silico investigations indicated that teucmosin possessed good pharmacokinetic properties, drug-likeness, and low toxicities on most common targets in Alzheimer's disease.

In silico results for H. aromatica essential oil identified six potential targets via Swiss Target Prediction — including AChE, CYP51, PPAR, COX-2, and tyrosinase-related protein 1 (TYRP1) — and molecular docking studies revealed that linalool, spathulenol, and aromadendrene oxide-2 produced docking scores of −7.4, −8.5, and −8.3 kcal/mol, respectively.

Three new aromatic compounds from H. occulta — including two methylenedioxy-phenyl-hydroxyphenyl alkyl chains — exhibited inhibitory activity against BACE1, with IC50 values of 0.82–1.09 μmol/L. BACE1 is the beta-secretase enzyme implicated in amyloid precursor protein processing in Alzheimer's disease. This is a purely in vitro biochemical finding with no clinical correlates yet reported.

4.6 Neuropharmacological Effects (Animal Models)

Evidence level: Preliminary — animal studies only; no human data available.

A study explored in vivo neuropharmacological effects of methanolic extract of H. aromatica (MEHA) leaves using hole-board, tail suspension, forced swimming, and elevated plus maze tests. The results indicated potential anxiolytic and antidepressant-like effects in animal models; however, these findings have not been replicated or extended to human clinical trials.

4.7 Anti-diabetic Activity

Evidence level: Preliminary — in vitro and in silico only.

For the first time, a 2025 study reported anti-diabetic, anti-tyrosinase, and acetylcholinesterase inhibitory activities of H. aromatica rhizome essential oil (HAEO). These assessments were conducted via combinative in vitro and in silico approaches; no animal or human trial data for anti-diabetic effects have been published.

4.8 Anti-viral Activity

The evaluation of the effect of sesquiterpenoids from H. occulta on porcine epidemic diarrhea virus (PEDV) replication showed that compounds 1–5, 12, 14, 16, 17, 19, and 21 increased cell viability against cell death in PEDV-infected cells. This represents in vitro data only.

5. Body Systems and Health Areas Associated with Homalomena

• Musculoskeletal system: The plant has been used in TCM for the treatment of rheumatoid arthritis, strengthening tendons and bones, and invigorating the kidney and liver. In vitro work has identified sesquiterpenoids that stimulate osteoblast proliferation and inhibit osteoclastogenesis.
• Skin and dermatological health: Traditional preparations using the juice of the whole plant as a lotion for skin diseases are documented, and in vitro studies confirm antifungal (dermatophyte) and antibacterial activity of the essential oil.
• Digestive system: H. occulta rhizomes have long been used in TCM for treatment of stomach aches and gastroenteritis.
• Nervous system: Preliminary in vitro data support AChE inhibitory activity of sesquiterpenoids from H. pendula, and BACE1 inhibition by aromatic compounds from H. occulta; animal studies suggest potential anxiolytic and antidepressant activity.
• Respiratory system: Traditional use of leaves and rhizomes includes treatment of colds and asthma.
• Cardiovascular/hematological: In vitro thrombolytic activity has been reported for H. aromatica leaf extracts.
• Metabolic: Preliminary in vitro and in silico anti-diabetic activity has been identified for H. aromatica essential oil.

6. Dosage Forms and Reported Dosages

Formal pharmacokinetic or dose-ranging clinical studies have not been published for any Homalomena species. The dosage information available comes exclusively from traditional medicine sources:

• TCM decoction: The typical dosage of Homalomena in TCM is between 5 and 10 grams, usually decocted in water.
• Wine-soaked preparation: Homalomena rhizome soaked in wine with other herbs is indicated for wind-damp obstruction syndrome with cold pain of the lower back and knees and spasms of the lower limbs.
• Essential oil: The rhizomes of H. aromatica yield approximately 2% essential oil by weight under steam distillation. In vitro antimicrobial studies used oil concentrations in the range of 1.2–1.8 µl/ml (minimum cidal concentration against fungi); these are laboratory assay concentrations and do not represent therapeutic dosages for human use.
• Topical: Poultices, decoctions, and topical applications of the rhizomes and leaves for joint pain and skin conditions are described in ethnobotanical literature, but no standardized topical dosage has been defined in the published scientific literature.

No human pharmacokinetic data, no established bioavailability parameters, and no evidence-based dosage recommendations exist for any Homalomena species or preparations.

7. Safety Considerations

Calcium Oxalate Crystal Content (Araceae Family Hazard)

Homalomena rubescens is toxic to pets and humans if ingested; the plant contains calcium oxalate crystals, which can cause irritation and swelling in the mouth and throat. All parts of the plant contain calcium oxalate crystals that are toxic to dogs and cats; the sap can also irritate the skin and eyes. This is a characteristic shared broadly across the Araceae family.

According to the American Veterinary Medical Association's Pet Poison Guide, the houseplants that are reported to have caused the most pet poisonings are in the plant family Araceae, which includes the genus Homalomena; these plants contain varying amounts of calcium oxalate crystals in their sap, which are released when bruised, crushed, chewed, or bitten, causing irritation and swelling in the mouth and throat and difficulty swallowing and breathing.

Genotoxicity of Essential Oil

Genotoxicity analysis showed that H. aromatica essential oil (HAEO) has a moderate toxic effect. This was determined in a 2024/2025 in vitro study using combinative in vitro and in silico approaches. The clinical relevance and dose-dependency of this finding have not been further characterized in vivo.

Overdose Reports (TCM Context)

There are two reported cases of overdose with symptoms including nausea, vomiting, dizziness, convulsions, unconsciousness, and urinary and bowel incontinence. These reports appear in TCM pharmacopoeial sources and concern overdose specifically in the context of decocted rhizome use; the doses involved are not specified in the available summary.

TCM Contraindications

In TCM, Homalomena should not be given to patients diagnosed with yin deficiency. This contraindication reflects traditional constitutional medicine principles specific to Chinese medical theory.

Skin and Mucosal Irritation from Sap

The sap of the plant can cause skin irritation in humans; wearing gloves when handling the plant is advisable.

Absence of Drug Interaction Data

No peer-reviewed, pharmacological drug–herb interaction studies for any Homalomena species have been published in accessible scientific literature. As of the most recent review of this herb, there are no known drug interactions or adverse side effects formally associated with taking Homalomena in the literature surveyed by one TCM reference source. The absence of documented interactions should not be interpreted as confirmed safety, given the limited clinical data overall.

8. Current State of Evidence and Research Gaps

The overall body of scientific evidence for Homalomena as a medicinal or dietary supplement ingredient remains at a preliminary stage. The majority of published work consists of:

• Phytochemical isolation and characterization studies (in vitro)
• Cell-based (in vitro) bioactivity assays in macrophage or bone cell lines
• Animal model studies (rodent behavioral pharmacology)
• In silico (computational docking) analyses

No published randomized controlled trials, dose-response studies, pharmacokinetic studies in humans, or systematic reviews of clinical evidence were identified for any Homalomena species as of the time of writing. The biological activities consistently described — anti-inflammatory, bone-protective, antimicrobial, and neuroprotective — align mechanistically with traditional uses, but the translation of these in vitro findings into demonstrated human efficacy remains unestablished. Homalomena aromatica Schott, a member of the Araceae family, is considered pivotal in both medicinal and aromatic purposes, and current literature highlights ethnobotany, phytochemistry, and biological activities as areas of ongoing investigation and future pharmacological development.

References

• Wikipedia — List of Homalomena species (Plants of the World Online data)
• GBIF Backbone Taxonomy — Homalomena Schott (genus)
• GBIF Backbone Taxonomy — Homalomena aromatica (Spreng.) Schott
• GBIF Backbone Taxonomy — Homalomena rubescens (Roxb.) Kunth
• GBIF Backbone Taxonomy — Homalomena occulta (Lour.) Schott
• Wikipedia — Homalomena (genus)
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