Plumeria lancifolia

Plumeria lancifolia (Agoniada): A Comprehensive Reference

1. Identity, Taxonomy, and Nomenclature

Plumeria lancifolia Müll.Arg. is the historically used botanical name for a South American tree that is today placed under the accepted current name Himatanthus bracteatus (A.DC.) Woodson, with the synonym Himatanthus lancifolius (Müll.Arg.) Woodson also appearing prominently in the pharmacological and ethnobotanical literature. The taxonomic transfer was executed by Robert Everard Woodson in 1938, following his systematic evaluation of the genera Plumeria L. and Himatanthus Willd. published in the Annals of the Missouri Botanical Garden. Plumeria lancifolia Müll.Arg. is a synonym now placed within the genus Himatanthus, as formalized through Woodson's 1938 evaluation of the genera Plumeria and Himatanthus.

The preferred current name is Himatanthus lancifolius, with the authority (C. Müller) Woodson, classified within Kingdom Plantae, Order Gentianales, Family Apocynaceae, Subfamily Rauvolfioideae, Genus Himatanthus.

The native range of this species is South Tropical America. It is a tree growing primarily in the wet tropical biome and is used as both a medicine and for food. Its documented native range encompasses Brazil (North, Northeast, Southeast, West-Central), Ecuador, French Guiana, Guyana, Peru, Suriname, and Venezuela.

In commerce and in older scientific literature, the name Plumeria lancifolia continues to appear, particularly in Brazilian herbal trade and pharmacological studies, where it is sold under the vernacular name agoniada. The scientific name Himatanthus lancifolius (Woodson, Apocynaceae) was formerly known as Plumeria lancifolia, and is popularly called "agoniada" in Brazil. Other recorded common names include banana-de-papagaio (in Portuguese). The genus Himatanthus Willd. ex Schult. was initially included in the genus Plumeria, and the large bracts involving the floral buttons are determinants for the separation of the two genera.

The genus Plumeria of the Apocynaceae family has a rich history of traditional medicines supported by empirical evidence. Within the family Apocynaceae, Plumeria is placed in the subfamily Rauvolfioideae, tribe Plumerieae, and subtribe Plumeriinae.

Common Forms and Preparations

• Dried stem bark: The primary commercial and traditional form; H. lancifolius is a shrub of medicinal importance, and in South American traditional medicine, the dried stem bark of the plant is used to cure snakebite, malaria, tumors, arthritis, and gastritis, among other ailments.
• Bark tea (decoction): The plant is sold commercially as 100% Agoniada Bark (Plumeria lancifolia or Himatanthus lancifolius).
• Fluid extract and tincture: Plumeria can be used in the form of tea, capsules, tincture, or fluid extracts, which are prepared from the plant's flowers or bark.
• Component of commercial pharmaceutical products: Himatanthus lancifolius is an official plant of the Brazilian Pharmacopeia I (1929) and forms part of the composition of commercial products indicated in the treatment of dysmenorrhea and in the amelioration of menopausal symptoms.

2. Traditional and Historical Use

Charles Plumier, a 17th-century French botanist, coined the name Plumeria. Since then, species of Plumeria have been used extensively throughout the world for their medicinal and ornamental value, and the period from the early 19th century has been an era of extensive research regarding extraction, isolation, structure elucidation, and establishment of pharmacological activity of chemical constituents of plants of the Plumeria species.

Phytochemical studies on the genus Plumeria started as far back as 1870, when Peckolt and Boorsma reported the isolation of the main iridoid glucoside plumieride from the stem bark of P. rubra and P. lancifolia, respectively.

H. lancifolius is a Brazilian native shrub, laticiferous, popularly known as "agoniada," and it is mainly used for uterine disorders.

Brazil and South America

The plant is a popular herbal remedy in Brazil, where it is gathered from the wild; it is also traded in local markets and exported to countries such as the United States.

Himatanthus lancifolius, popularly known as "agoniada" in Brazil, is largely used in folk medicine against asthma, dysmenorrhea, and as an emmenagogue and abortive.

The dried stem bark has been commonly used as a febrifuge, as an emmenagogue, and as an abortive.

The plant, known in folk medicine as agoniada, is indicated to treat skin diseases, asthma, syphilis, and mainly to stimulate uterine contractions, helping with conception and regularizing menstruation.

Traditional applications, as documented in ethnobotanical surveys of Brazilian folk medicine, include:

• The seeds were used by indigenous peoples to manufacture special pieces for celebrations, and the bark was used to help prevent the spread of malaria. This natural preparation is known to influence uterine and vaginal well-being and is used to relieve symptoms caused by menstruation and menopause.
• Traditional healers valued the plant for its ability to alleviate fevers, soothe skin irritations, and relieve pain. Decoctions made from its bark and leaves were often used as remedies for digestive issues, such as diarrhea and dysentery, as well as to reduce inflammation and swelling.
• The aromatic flowers were sometimes infused in oils or balms to calm nerves and promote restful sleep.

The bark is recorded in botanical literature as antiasthmatic, antisyphilitic, emmenagogue, and purgative.

Across the broader Plumeria / Himatanthus genus in tropical South America and Southeast Asia: Species of Plumeria are known for their diverse medicinal uses in indigenous medicine, mainly as purgative, rubefacient, emmenagogue, febrifuge, or diuretic, and for treatment of dropsy, dysuria, diarrhea, itch, bronchitis, cough, asthma, fever, piles, dysentery, blood disorders, and tumors.

3. Key Chemical Constituents and Active Compounds

Chemical investigations have revealed that the plant is rich in indole alkaloids, with uleine as its dominant compound.

Indole Alkaloids (Bark)

The isolation of (+)-uleine (1) and (+)-demethoxyaspidospermine (2) from the bark of Plumeria lancifolia is reported along with ¹H- and ¹³C-NMR data. This was published in the journal Fitoterapia (2000, vol. 71, pp. 208–210) by França, Brown, and Santos. GC-MS investigation of components of the alkaloidal fraction (AlkF) resulted in the identification of 3 main indole alkaloids: uleine (53%), its isomer (13%), demethoxyaspidospermine (23.8%), and traces of at least five other alkaloids.

Uleine is a tetracyclic indole alkaloid belonging to the aspidosperma-type structural class. It is the dominant alkaloid and the compound most extensively studied for the plant's pharmacological activities.

Iridoid Glucosides (Bark and Latex)

Phytochemical studies on the genus Plumeria started as far back as 1870 when Peckolt and Boorsma reported the isolation of the main iridoid glucoside plumieride from the stem bark of P. rubra and P. lancifolia, respectively. Plumieride is one of the defining chemotaxonomic markers of the genus Himatanthus/Plumeria. The iridoids plumieride (major) and isoplumieride (minor) have been identified by HPTLC in extracts of the leaves, barks, and latex of related Himatanthus species.

Broader Class Profile of the Genus

The genus encompasses a wide range of natural compounds, including iridoids, triterpenoids, alkaloids, flavonoids, steroids, cardiac glycosides, quinones, anthocyanins, cardenolides, fatty acid esters, lignans, and coumarins. For P. lancifolia / H. lancifolius specifically, confirmed isolates from published peer-reviewed reports include:

• Indole alkaloids: Uleine (+), demethoxyaspidospermine (+) — isolated from bark (França et al., Fitoterapia, 2000).
• Iridoid glucoside: Plumieride — isolated from stem bark (Boorsma, 1870s; also referenced across the genus).
• Triterpenoids: Triterpenoids are very common chemical constituents of the Plumeria species; approximately 37 triterpenoids have been reported from various parts of related species.

Recent phytochemical analyses of Plumeria lancifolia have also revealed the presence of various bioactive compounds, including flavonoids, alkaloids, and triterpenoids. However, comprehensive phytochemical profiling specific to P. lancifolia / H. lancifolius (beyond the alkaloids and plumieride) remains limited in the published peer-reviewed literature, and many broader phytochemical statements in the literature draw from studies on closely related species such as P. rubra, P. obtusa, and H. sucuuba.

4. Established and Proposed Mechanisms of Action

Calcium Channel Modulation / Smooth Muscle Relaxation

Studies reveal that the bark of Himatanthus lancifolius possesses one or more indole alkaloids able to alter non-vascular and vascular smooth muscle responsiveness, an event that may involve the blocking of calcium entry or changes in intracellular calcium utilization or mobilization.

Leukocyte Trafficking Inhibition (Anti-inflammatory)

The uleine-rich fraction significantly inhibits the migration of casein-induced granulocytes and their adhesion to fibronectin and vitronectin, along with mononuclear cells, by down-regulating the expression of α4β1 and α5β1 integrins. These data suggest that H. lancifolius has the potential to interfere with leukocyte trafficking through its uleine-rich fraction, emphasizing its usefulness in inflammatory conditions.

Acetylcholinesterase (AChE) Inhibition

The study of AChE inhibitory activity of the Brazilian Apocynaceae Himatanthus lancifolius led to the identification of active extracts and allowed the isolation of uleine, an active indole alkaloid, at a high concentration in the alkaloid fraction.

Nitric Oxide Modulation and Antioxidant Activity

The alkaloidal fraction demonstrated antioxidant activity of 59.3 ± 0.8% (phosphomolybdenum method); in the DPPH assay, the alkaloidal fraction presented an IC₅₀ = 196.3 ± 8.9 µg/mL, while uleine alone showed an IC₅₀ of 6,475.0 ± 25.0 µg/mL. Uleine also stimulated a maximum nitric oxide production at concentrations of 0.1 µg/mL (20.9 ± 1.4 µM) and 1 µg/mL (41.1 ± 0.2 µM) in RAEC and B16F10 cells, respectively.

Immunomodulation (Lymphocyte Proliferation)

The uleine-rich fraction from the barks of Himatanthus lancifolius was shown to inhibit the proliferation of phytohemagglutinin-stimulated lymphocytes by blocking their transformation into blast-dividing cells. Furthermore, it inhibited the proliferation of Daudi and Reh cells, two leukemic cell lines of lymphoid origin. This study widened the biological applications of H. lancifolius alkaloids to include its possible use as a modulator of the immune system.

5. Scientific Evidence by Area of Use

5.1 Gynecological Use (Dysmenorrhea, Uterine Smooth Muscle)

Evidence Level: Preclinical (ex vivo animal tissue), no controlled human trials.

This study reveals the effects of an alkaloid-rich fraction (AlkF) obtained from the bark of Himatanthus lancifolius in vascular and non-vascular smooth muscle responsiveness. Incubation of AlkF (3–30 µg/mL) during 15 min generated a concentration-related and fully reversible reduction in maximal contractile responses evoked by acetylcholine and phenylephrine in rat jejunum and aorta preparations, respectively. Exposure of endothelium-denuded pre-contracted rat aorta rings to AlkF resulted in complete relaxation, with an EC₅₀ of 22.2 (16.2–28.2 µg/mL).

AlkF was also able to induce a concentration-related rightward shift of cumulative concentration curves for calcium in uterus and aorta rings maintained in depolarizing nutritive solution. This ex vivo data provides a potential mechanistic rationale for the traditional emmenagogue use, but no controlled clinical trials in humans have been published. Himatanthus lancifolius is an official plant of the Brazilian Pharmacopeia I (1929) and forms part of the composition of commercial products indicated in the treatment of dysmenorrhea and in the amelioration of menopausal symptoms.

5.2 Antimicrobial Activity

Evidence Level: Preclinical in vitro only.

The alkaloidal fraction from Himatanthus lancifolius bark possesses broad-spectrum in vitro antimicrobial properties against most of the tested Gram-negative and Gram-positive microorganisms. The alkaloidal fraction from Himatanthus lancifolius barks demonstrated broad-spectrum in vitro antimicrobial activity for most of the Gram (+) and Gram (–) tested microorganisms. No clinical trials exist evaluating antimicrobial efficacy in human infections.

5.3 Anti-inflammatory Activity

Evidence Level: Preclinical in vitro (human cell-based assay) — no animal model studies or human clinical trials for this species specifically.

The aim of a published study was to investigate the anti-inflammatory activities of the uleine-rich fraction extracted from the barks of Himatanthus lancifolius, focusing on in vitro effects on some steps of the inflammatory response using peripheral human leukocytes. The results showed that the uleine-rich fraction significantly inhibits the migration of casein-induced granulocytes and their adhesion to fibronectin and vitronectin, along with mononuclear cells, by down-regulating the expression of α4β1 and α5β1 integrins. This was published in Planta Medica (2008, vol. 74). While peripheral human leukocytes were used, this remains an in vitro cell assay and does not constitute clinical evidence.

5.4 Gastroprotective Activity

Evidence Level: Preclinical (rodent models).

The indole alkaloid mixture (AlkF) obtained from the barks of Himatanthus lancifolius was evaluated for gastroprotective properties in rodents. The results showed the novel gastroprotective properties of the indole AlkF of H. lancifolius through a variety of mechanisms. A crude extract has been shown to possess antiulcer activity. No human studies have been conducted.

5.5 Immunomodulatory / Anti-proliferative Activity

Evidence Level: Preclinical in vitro (human cell lines) — no human clinical trials.

The uleine-rich fraction inhibited the proliferation of phytohemagglutinin-stimulated lymphocytes by blocking their transformation into blast-dividing cells, and inhibited the proliferation of Daudi and Reh cells, two leukemic cell lines of lymphoid origin. Published in Planta Medica (2009). These findings are from in vitro leukemic cell line assays and do not constitute evidence of anti-cancer efficacy in humans.

5.6 Acetylcholinesterase Inhibition / Neuroprotective Potential

Evidence Level: Preclinical in vitro enzyme assay — no human trials.

The study evaluated Himatanthus lancifolius and its main indole alkaloid uleine as AChE inhibitors. The plant fluid extract, fractions, and uleine were tested for AChE inhibitory activity using Ellman's colorimetric method. Both TLC assays showed similar results. At 5 mg/mL, the fluid extract inhibited the AChE enzyme by (50.71 ± 8.2)%. The ethyl acetate fraction exhibited the highest level of AChE inhibition, followed by the dichloromethane fraction. Published in Zeitschrift für Naturforschung C (2010, vol. 65, pp. 440–444). The extracts of H. lancifolius have also shown a potent anticholinesterase effect and hindered amyloid beta aggregation, which highlights its potential for treating Alzheimer's disease. No human studies have followed.

5.7 Anti-malarial Activity

Evidence Level: Preclinical in vitro and in vivo (rodent models); no human trials for this species.

Research on closely related species within the genus supports the traditional use for malaria. Plumieride was isolated from the ethyl acetate fraction of the ethanol extract of H. articulatus. Both dichloromethane and ethanol extracts reduced parasitemia in Plasmodium berghei-infected mice. Separate studies on H. articulatus found that the ethanol extract proved to be a promising anti-malarial medicine and showed low toxicity. These data are from a related species and should not be directly extrapolated to H. lancifolius without specific study.

5.8 Overall Evidence Assessment

To date, there are limited clinical trials specifically evaluating the efficacy and safety of Plumeria lancifolia in humans. Most available research is preclinical, focusing on in vitro or animal models. While the plant shows promise as a source of natural compounds that may support health, definitive evidence from well-designed human studies is currently lacking.

6. Body Systems and Health Areas Associated with Plumeria lancifolia

• Reproductive / Gynecological system: Use recorded for relief of menstrual cramps, regulation of the menstrual cycle, uterine inflammation, vaginal discharge, and urinary infections.
• Gastrointestinal system: Decoctions from bark and leaves used as remedies for digestive issues such as diarrhea and dysentery.
• Immune / inflammatory system: Indole alkaloid–rich fractions have been evaluated for their antimicrobial, anti-inflammatory, gastroprotective, and immunosuppressive effects.
• Nervous system (Alzheimer's disease potential): The extracts of H. lancifolius have also shown a potent anticholinesterase effect and hindered amyloid beta aggregation, which highlights its potential for treating Alzheimer's disease.
• Respiratory system: The plant is indicated in folk medicine to treat skin diseases, asthma, and syphilis.
• Infectious diseases (antimicrobial, malaria): In South American traditional medicine, the dried stem bark is used to cure snakebite, malaria, tumors, arthritis, and gastritis, among other ailments.

7. Dosage Forms and Reported Dosages

Rigorous dose-ranging clinical studies specific to Plumeria lancifolia / Himatanthus lancifolius have not been published. The following dosage data are derived from pharmacological studies or traditional use records:

• Alkaloid-rich fraction (in vitro / ex vivo studies): Incubation of AlkF at 3–30 µg/mL for 15 minutes was used in tissue preparations to study smooth muscle responsiveness.
• Fluid extract (AChE inhibition study): At 5 mg/mL, the fluid extract inhibited the AChE enzyme by 50.71 ± 8.2%.
• Tincture (traditional use record): A tincture, described as a liquid extract made from the leaves, is cited in traditional use documentation at a dose of 2 drops/kg/day divided 3 to 4 times a day. This figure is from a traditional use record, not a controlled clinical trial.
• Bark decoction / bark tea: Bark decoctions are sold commercially in Brazil and exported, but no standardized dose expressed in milligrams or grams has been validated in peer-reviewed clinical studies for this species.

8. Safety Considerations and Notable Interactions

Abortifacient / Emmenagogue Risk

Himatanthus lancifolius is largely used in folk medicine against asthma, dysmenorrhea, and as an emmenagogue and abortive. The dried stem bark is commonly used as a febrifuge, as an emmenagogue, and as an abortive. The mechanistic basis for uterine stimulation is supported by ex vivo pharmacological evidence showing that the alkaloidal fraction can alter uterine smooth muscle calcium utilization. Excessive use of plumeria can lead to side effects such as increased menstrual flow, miscarriage, or diarrhea. The plant is not recommended for children, pregnant, or breastfeeding women.

Toxicity at High Doses

This herb should be treated with caution since it is toxic, and high doses can cause faintness, unconsciousness, and death. This warning appears in botanical reference databases citing Corrêa's authoritative multivolume work on Brazilian plants.

Latex Irritation

The trunk and branches of Plumeria species have a milky latex sap that, like many other Apocynaceae, contains poisonous compounds that irritate the eyes and skin.

Immunosuppressive Effects

The uleine-rich fraction inhibited the proliferation of phytohemagglutinin-stimulated lymphocytes by blocking their transformation into blast-dividing cells. The study widened the biological applications of H. lancifolius alkaloids to include its possible use as a modulator of the immune system. This immunosuppressive potential represents a theoretical concern for individuals with compromised immunity or those taking immunosuppressive medications.

Calcium Channel Blocking Activity

The bark possesses one or more indole alkaloids able to alter non-vascular and vascular smooth muscle responsiveness, an event that may involve the blocking of calcium entry or changes in intracellular calcium utilization or mobilization. This mechanism could theoretically interact with calcium channel blocker medications or affect cardiovascular function at pharmacologically relevant doses, although no specific drug interaction studies have been conducted.

Pharmacopoeial Status

Himatanthus lancifolius is an official plant of the Brazilian Pharmacopeia I (1929) and forms part of the composition of commercial products indicated in the treatment of dysmenorrhea and in the amelioration of menopausal symptoms. Its inclusion in the Brazilian Pharmacopeia represents recognition of its historical medical use, but the 1929 edition predates modern standards for clinical evidence and safety evaluation. No EMA, WHO monograph, NIH Office of Dietary Supplements fact sheet, or Cochrane review has been identified for this specific species.

References

• França OO, Brown RT, Santos CAM. Uleine and demethoxyaspidospermine from the bark of Plumeria lancifolia. Fitoterapia. 2000;71:208–210. PubMed.
• Rattmann YD et al. Effects of alkaloids of Himatanthus lancifolius (Muell. Arg.) Woodson, Apocynaceae, on smooth muscle responsiveness. J Ethnopharmacol. 2005. PubMed.
• Nardin JM et al. Effects of Himatanthus lancifolius on human leukocyte chemotaxis and their adhesion to integrins. Planta Med. 2008;74:1253–1258. PubMed.
• Uleine-rich fraction of Himatanthus lancifolius blocks proliferative responses of human lymphoid cells. Planta Med. 2009. PubMed.
• Seidl C et al. Acetylcholinesterase inhibitory activity of uleine from Himatanthus lancifolius. Z Naturforsch C J Biosci. 2010;65(7-8):440–444. PubMed.
• Vale VV et al. Anti-malarial activity and toxicity assessment of Himatanthus articulatus, a plant used to treat malaria in the Brazilian Amazon. Malaria Journal. 2015;14:132. PMC.
• Himatanthus Willd. ex Schult. (Apocynaceae): Review. PMC.
• Natural AChE Inhibitors from Plants and their Contribution to Alzheimer's Disease Therapy. PMC.
• Rattmann YD et al. Effects of alkaloids of Himatanthus lancifolius on smooth muscle responsiveness. ScienceDirect / J Ethnopharmacol. 2005.
• Souza WM et al. Antimicrobial activity of alkaloidal fraction from barks of Himatanthus lancifolius. Fitoterapia. 2004. ScienceDirect.
• Plumeria obtusa L.: A systematic review of its traditional uses, morphology, phytochemistry and pharmacology. ScienceDirect.
• Himatanthus lancifolius (Müll.Arg.) Woodson — Chapter. ScienceDirect (Elsevier book chapter, 2020).
• A review on phytochemical constituents, analytical data, and pharmacological properties of the genus Plumeria. Medicinal Chemistry Research. Springer Nature. 2024.
• Himatanthus bracteatus (A.DC.) Woodson. Plants of the World Online. Kew Science.
• Himatanthus bracteatus (A.DC.) Woodson — Synonyms. GBIF.
• Himatanthus lancifolius (HMHLA). EPPO Global Database.
• Himatanthus lancifolius (Müll.Arg.) Woodson. World Flora Online.
• Spina AP et al. Typifications, new synonyms and a new combination in Himatanthus (Apocynaceae). TAXON. 2013.
• Anti-inflammatory evaluation of leaves of Plumeria acuminata. PMC.
• Chemical Characterization, Antioxidant, Antimicrobial, and Antibiofilm Activities of Essential Oils of Plumeria alba. PMC.
• Biological Activity and Isolation of Compounds from Stem Bark of Plumeria acutifolia. PMC.
• Phytochemical and Pharmacological activity of Genus Plumeria: An updated review. ResearchGate.
• Himatanthus lancifolius. Useful Tropical Plants Database.
• Pharmacological Justification for the Medicinal Use of Plumeria rubra Linn. in Cardiovascular Disorders. PMC.
• Plumeria. Wikipedia (taxonomy and synonymy section).