86 Hemp-Dogbane

Names

Common name – Hemp Dogbane

Scientific name – Apocynum cannabinum

Other names – Indian Hemp, sṕ’áts’enúl

Fig 36.1: Upright stems and opposite, oval leaves of Apocynum cannabinum (Hemp-Dogbane / Indian Hemp), showing the reddish-tinged stems and milky latex characteristic of this toxic yet medicinally important perennial herb of the Apocynaceae family.

Fig 36.2: Full-length photograph of a mature Apocynum cannabinum plant in fruit, displaying the paired, elongated seed pods (follicles) characteristic of the species, which split open to release wind-dispersed seeds with silky white plumes.

Fig 36.3: Landscape view of a riparian habitat colonized by Apocynum cannabinum, illustrating the plant’s characteristic dense stands along stream banks and open disturbed ground typical of interior British Columbia.

Fig 36.4: Close-up botanical illustration of the root system of Apocynum cannabinum, showing the thick, fleshy rhizome from which medicinal root preparations and fiber extractions were traditionally made.

Fig 36.5: Structural diagram of cymarin (C₃₀H₄₄O₉), the primary cardiac glycoside of Apocynum cannabinum, showing its steroid backbone, α,β-unsaturated lactone ring at C-17, and cymarose sugar moiety linked at the 3β position — the features responsible for Na⁺/K⁺-ATPase inhibition and positive inotropic activity.

Fig 36.6: Structural diagram of quercetin (C₁₅H₁₀O₇; 3,3′,4′,5,7-pentahydroxyflavone), a major flavonoid identified in Apocynum cannabinum, illustrating the five hydroxyl groups that confer potent free-radical scavenging and anti-inflammatory activity.

Fig 36.7: Structural diagram of β-sitosterol (C₂₉H₅₀O), a phytosterol isolated from Apocynum cannabinum plant tissues, showing its cholesterol-analog backbone with an additional ethyl group at C-24 that contributes to membrane stabilization and anti-inflammatory effects.

General information

Hemp Dogbane (Apocynum cannabinum), also known as Indian Hemp, has been extensively used by Indigenous peoples for both medicinal and practical purposes – as a medicine to treat a wide variety of conditions, and as a fiber to produce thread, cord, garments, nets, snares and mats. ^[8] Hemp Dogbane contains the glycoside, cymarin, which was used as a cardiac stimulant, a diuretic, a diaphoretic, a febrifuge, a rheumatism remedy, and a treatment for gall stones, demonstrating the sophisticated understanding Indigenous peoples had of this plant’s multiple therapeutic applications. ^{[6, 8]} This represents one of the most pharmacologically significant plants in Indigenous medicine, with modern research confirming the presence of potent cardiac glycosides that explain its traditional therapeutic applications. ^[7]

Traditional Indigenous Uses

Hemp-Dogbane was not a medicine to be used lightly, for its strength could both heal and harm. Those who worked with it knew that even the smallest amount carried great potency. The roots, when prepared as a tea or tincture, were used to strengthen the heart and steady its rhythm. The same medicine also helped the body release excess water and cleanse the kidneys, easing swelling and heaviness. ^{[3, 8]}

When fevers or illness struck, Hemp-Dogbane was brewed into a hot tea to draw sweat and help the body purify itself. The people would say it “opened the skin,” letting sickness leave through the pores. For joint pain or arthritis, the roots were made into poultices or decoctions, easing inflammation and stiffness. In smaller doses, it supported digestion, settling sluggish bowels and easing discomfort after heavy meals. Yet, in stronger preparations, the same plant could act as a purgative or even induce vomiting, used carefully by healers to cleanse the body of poisons or for spiritual purification. ^{[2, 6]}

The plant was called upon to treat liver ailments and venereal diseases, its fresh root chewed only for the juice, never swallowed whole. A wash prepared from its extract was used to stimulate the scalp and prevent hair loss, while mild infusions were drunk to ease headaches that arose from digestive imbalance. ^{[2, 8]}

Important Safety Note

All parts of the plant contain toxic cardiac glycosides that can cause potentially fatal cardiac arrhythmias if ingested. ^{[1, 7]} Traditional use required extensive knowledge and careful dosing. ^[3]

Biochemical Basis for Medicinal Properties

Key Bioactive Compounds

Hemp Dogbane contains several classes of bioactive compounds responsible for its medicinal properties: ^{[7, 1]}

1. Cardiac Glycosides (Primary Active Compounds)
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5. Bidlack, J. E., & Jansky, S. H. (2011). Stern’s Introductory Plant Biology. McGraw-Hill.
6. Foster, S., & Duke, J. A. (2000). A Field Guide to Medicinal Plants and Herbs of Eastern and Central North America. Houghton Mifflin.

Major Cardiac Glycosides:

• Cymarin – Primary cardiac glycoside
• Apocynamarin
• Strophanthidin derivatives
• Cymarol

Chemical Structure of Cymarin:

• Molecular Formula: C₃₀H₄₄O₉
• Structure: Steroid backbone with sugar moiety (cymarose)
• Functional Groups: Hydroxyl groups, lactone ring, digitoxose sugar

Mechanism of Action:

Na⁺/K⁺-ATPase Pump Inhibition → Increased Intracellular Ca²⁺ → Enhanced Cardiac Contractility ^[7]

Chemical Reaction:

Cymarin + Na⁺/K⁺-ATPase → Cymarin-ATPase Complex (Inhibited)

Result: ↑[Ca²⁺]ᵢ → ↑Cardiac Contractile Force

2. Flavonoids and Phenolic Compounds

Key Compounds:

• Quercetin and its glycosides
• Kaempferol derivatives
• Rutin
• Chlorogenic acid

Antioxidant Mechanism:

Flavonoid-OH + ROS → Flavonoid-O• + H₂O

(Radical scavenging reaction)

3. Triterpenes and Sterols

Compounds:

• β-Sitosterol
• Ursolic acid
• Oleanolic acid

Function: Anti-inflammatory and hepatoprotective effects ^[1]

4. Alkaloids (Minor Components)

Compounds:

• Apocynin
• Various indole alkaloids

Detailed Biochemical Mechanisms

1. Cardiac Activity

Primary Mechanism: Inhibition of Na⁺/K⁺-ATPase ^[7]

Normal State: Na⁺/K⁺-ATPase → 3Na⁺ out, 2K⁺ in

Cymarin Inhibition → Reduced Na⁺ efflux → Increased intracellular Na⁺ → Na⁺/Ca²⁺ exchanger reversal → Increased intracellular Ca²⁺

→ Enhanced cardiac contractility

Structure-Activity Relationship

2. Diuretic Action

Mechanism:

1. Direct Renal Effect: Inhibition of Na⁺/K⁺-ATPase in kidney tubules
2. Cardiac Output Enhancement: Improved circulation increases glomerular filtration
3. Hormonal Effects: Modulation of ADH and aldosterone activity ^{[6, 8]}

3. Anti-inflammatory Properties

Pathway:

Inflammatory Stimulus → NF-κB Activation

↓ (Inhibited by triterpenes)

COX-2/LOX Expression → Prostaglandin/Leukotriene Production

↓ (Reduced)

Inflammatory Response ^[1]

4. Hepatoprotective Mechanism

Antioxidant Defense:

Hepatotoxin → ROS Generation → Lipid Peroxidation

↓ (Neutralized by flavonoids)

Cellular Protection → Liver Function Maintenance ^[1]

Chemical Structures of Key Biomolecules

Cymarin Structure

Steroid Backbone:

– 4-ring steroid nucleus (cholestane derivative)

– 14β-OH and 3β-OH hydroxyl groups

– α,β-unsaturated lactone at C-17

Sugar Component:

– Cymarose (2,6-dideoxy-3-O-methyl-D-ribo-hexose)

– Attached at 3β position via glycosidic bond ^[7]

Quercetin (Major Flavonoid)

β-Sitosterol

Traditional Preparation Methods and Dosage

Root Preparation (Most Common)

1. For Cardiac Conditions:
   • Dried root: 0.5-2 grams in decoction
   • Fresh root: Smaller amounts due to higher potency ^{[6, 8]}
2. For Diuretic Effect:
   • Root tea: 1-3 grams dried root per cup
   • Taken 2-3 times daily ^[8]
3. For Rheumatism :
   • Poultice: Fresh root mashed and applied topically
   • Internal: Very small doses of root decoction ^[6]

Safety Considerations in Traditional Use

Dosage-Dependent Effects:

• Low Doses: Diuretic, mild cardiac stimulation
• Moderate Doses: Strong cardiac effects, diaphoretic
• High Doses: Toxic – nausea, vomiting, cardiac arrhythmias ^{[7, 1]}

Traditional Safety Measures:

• Experienced healers only ^[3]
• Careful plant identification
• Seasonal collection timing
• Precise dosage calculation
• Patient monitoring

References

• 1. Chevallier, A. (2016). Encyclopedia of herbal medicine: 550 herbs and remedies for common ailments (Updated ed.). DK.
• 2. Densmore, F. (1974). How Indians use wild plants for food, medicine, and crafts. Dover Publications.
• 3. Elders and Community members of the Cayoose Creek Band of Sekw’el’was.
• 4. Foster, S., & Duke, J. A. (2000). A field guide to medicinal plants and herbs of Eastern and Central North America (2nd ed.). Houghton Mifflin.
• 5. Harrington, H. D. (1967). Edible native plants of the Rocky Mountains. University of New Mexico Press.
• 6. Kindscher, K. (1992). Medicinal wild plants of the prairie: An ethnobotanical guide. University Press of Kansas.
• 7. Kupchan, S. M., Hemingway, R. J., & Doskotch, R. W. (1964). Tumor inhibitors. IV. Apocannoside and cymarin, the cytotoxic principles of Apocynum cannabinum L. Journal of Medicinal Chemistry, 7 (6), 803–804. https://doi.org/10.1201/9781420005400-20
• 8. Moerman, D. E. (1998). Native American ethnobotany. Timber Press.
• 9. Turner, N. C., & Bell, M. A. M. (1971). The ethnobotany of the Coast Salish Indians of Vancouver Island. Economic Botany, 25 (1), 63–99. https://doi.org/10.1007/BF02894564
• 10. Weiner, M. A. (1990). Earth medicine—Earth food: Plant remedies, drugs, and natural foods of the North American Indians. Ballantine Books.