Bencao Gangmu - Wood Section
Overall Paraphrase
This chapter is the Wood Section of the Bencao Gangmu (Compendium of Materia Medica), documenting the properties, flavors, and clinical applications of a large number of woody plants and resinous medicinals. The text covers dozens of medicinal substances, including cypress (Bai), pine (Song), fir (Shan), cinnamon (Gui), clove (Dingxiang), soap bean (Zaojia), mulberry (Sang), elm (Yu), pagoda tree (Huai), eucommia (Duzhong), magnolia bark (Houpo), goji berry (Gouqi), poria (Fuling), and bamboo (Zhu). Following the "qi-flavor → indications" format, the ancients recorded their usage in treating wind disorders, blood disorders, pain syndromes, parasitic infestations, edema, cough with dyspnea, carbuncles and sores, urinary and fecal obstruction, and various gynecological and postpartum conditions.
From the content, the effects of wood-section medicinals can be broadly categorized as follows:
- Resinous and aromatic medicinals (e.g., pine resin, liquidambar resin, frankincense, myrrh, benzoin, lignum dalbergiae, borneol, camphor): The ancients considered these acrid, warm, and fragrant in nature, excelling at moving qi and activating blood, relieving pain and promoting tissue regeneration, and opening the orifices to revive the spirit. They were commonly used for epigastric and abdominal pain, traumatic injuries, non-healing sores, and wind-stroke with trismus.
- Tree bark and root bark medicinals (e.g., eucommia bark, magnolia bark, phellodendron bark, ash bark, silk-tree bark, elm white bark, erythrina bark, ailanthus bark): These primarily serve to descend qi and relieve distension, dry dampness and arrest dysentery, tonify the kidneys and strengthen the lower back, and clear heat to treat skin lesions, reflecting the correspondences-based reasoning of "using bark to treat the skin, branches to reach the limbs, and nodes to treat the joints."
- Fruit and seed medicinals (e.g., cypress seeds, chebulic myrobalan, Cherokee rose fruit, sour jujube seeds, gardenia fruit, glossy privet fruit, goji berries, bush-cherry seeds, soap bean seeds): These serve both calming the spirit, moistening the bowels, astringing and securing the essence functions, and clearing and purging stagnation effects, embodying the materia medica understanding that "the same substance in different sections can have different functions."
- Leaf and twig medicinals (e.g., mulberry leaf, arborvitae leaf, willow leaf, bamboo leaf, pine leaf, catalpa leaf): These are mostly used for external washing, mouth rinsing, smoke fumigation, and topical application to treat eye disorders, skin ulcers and tinea, wind-bi (arthralgia), and bleeding. Their properties are relatively light, floating, and dispersing.
- Toxic and drastic medicinals (e.g., croton seed, chaulmoogra seed, Omphalia, dried lacquer, asafoetida): The ancients considered these extremely potent, capable of attacking accumulations, killing parasites, breaking masses, and expelling water, but they are mostly annotated as "toxic" or "slightly toxic," with emphasis on cautious use.
Throughout this chapter, the ancients used "qi-flavor" to encompass medicinal properties and "indications" to correspond to disease patterns, constructing a therapeutic framework rooted in empirical experience and organized through the lens of yin-yang and the five phases.
🧠 Deep Understanding
Core Theoretical Principles 💡
The central intellectual tenet of the Wood Section lies in "wood's nature is one of free and upward movement" (mu xing tiao da). In traditional Chinese correspondences-based reasoning, wood governs generation, dredging, and extension; therefore, wood medicinals were believed to unblock qi movement, smooth the blood vessels, and elevate the clear yang. This manifests specifically as:
- Wind disorders frequently treated with wood medicinals: Conditions such as "wind-stroke," "wind-bi," and "wind-phlegm" were often treated with pine nodes, soap bean, tamarisk, and shrub chastetree. This is because wood can disperse wind, and branch and node medicinals can "reach the limbs via the branches."
- Blood disorders frequently treated with wood medicinals: Arborvitae leaf, pagoda tree flower, palm bark, and sappan wood were all used to arrest bleeding, activate blood, and resolve stasis. The ancients believed that wood can store and move blood, especially when carbonized—which enhances its astringent and hemostatic power.
- Dampness conditions and edema frequently treated with wood medicinals: Elm white bark, poria, polyporus, and Chinese tallow root bark were used for their "wood can percolate dampness" nature, promoting urination, reducing swelling, and facilitating the passage of urine.
- Parasitic infestations frequently treated with wood medicinals: Omphalia, elm fruit paste (Wuyi), and bitter chinaberry root bark were specifically used to kill intestinal parasites, constituting important sources of "anthelmintics" in ancient materia medica.
- Carbuncles, abscesses, and sores frequently treated with wood medicinals: Resinous substances such as rosin, frankincense, myrrh, and dragon's blood promote tissue regeneration and wound closure, reduce swelling, and relieve pain; bark medicinals such as phellodendron, redbud bark, and cotton rose leaf clear heat, resolve toxin, drain pus, and reduce swelling.
This "correspondences-based" (quxiang) thinking was an essential method by which the ancients constructed pharmacological theory. While not equivalent to modern pharmacological validation, it embodies a rudimentary systems perspective and holistic worldview.
Modern Understanding 🌟
From a modern pharmacological standpoint, many of the medicinals in the Wood Section indeed contain abundant volatile oils, resins, tannins, alkaloids, and flavonoids as bioactive constituents:
- Cypress seeds and sour jujube seeds: Rich in fatty oils and saponins; modern research suggests a certain sedative and mind-calming effect, consistent with the ancient experience of "nourishing the heart and calming the spirit."
- Magnolia bark and camphor: Contain magnolol, camphor, and other constituents with antibacterial, analgesic, and digestive-modulating activities.
- Phellodendron bark and ash bark: Contain berberine, aesculetin, and other alkaloids with well-established antibacterial and anti-inflammatory actions, aligning with the ancient use for "clearing heat and drying dampness."
- Poria and polyporus: Contain polysaccharides; modern pharmacology confirms their notable diuretic and immunomodulatory effects.
- Frankincense, myrrh, and dragon's blood: Resinous substances with anti-inflammatory, analgesic, and wound-healing activities; they remain important components of traditional Chinese external preparations to this day.
However, it must be pointed out: ancient "indications" were largely based on individual case experience and theoretical extrapolation, lacking modern clinical validation. Among these records, a number of formulas contain animal products (such as tiger leg bone, sow blood, pig bile), human feces, and boys' urine—clearly bearing the stamp of their era. Some substances, such as croton seed, chaulmoogra seed, Omphalia, and dried lacquer, are genuinely toxic, and the ancients repeatedly annotated them with "toxic" or "cautionary" warnings; they should never be used casually based solely on historical records. Absolute statements such as "restores vision," "definitely cures," or "miraculous effect" should be read as traditional cultural language, not as efficacy claims.
Health & Wellness Insights ⚡
From the theoretical framework of the Wood Section, several non-therapeutic lifestyle principles can be drawn:
- Follow the nature of wood—keep the emotions free-flowing: Wood corresponds to spring and governs free coursing (dredging/dispersing). In daily life, maintaining a cheerful emotional state, moderate exercise, and avoiding emotional stagnation helps keep qi and blood flowing smoothly.
- Regular daily routine—nourish the liver and sinews: The ancients held that wood corresponds to the liver and governs the sinews. Maintaining regular sleep habits, avoiding staying up late, and steering clear of excessive fatigue support liver blood and musculoskeletal health.
- Moderate diet—guard against accumulation: This chapter extensively addresses "retained food not digesting," "constipation," and "worm accumulation," highlighting the importance of dietary restraint and hygiene.
- External washing and skincare—natural and gentle: Methods such as washing the hair with mulberry leaf, arborvitae leaf, or willow leaf, and bathing the eyes with herbal decoctions, reflect the ancient wisdom of "external treatment does not harm the vital correct qi" and may serve as references for gentle cleansing practices.
📚 Related Knowledge
- Related Concepts: Qi-flavor theory (four natures and five flavors), correspondences-based reasoning (quxiang bielei)—using bark for skin, branches for limbs, five-phase classification (wood corresponds to the liver and governs free coursing), carbonized medicinals for hemostasis (burning to preserve nature), resins for tissue regeneration, bark medicinals for drying dampness.
- Further Reading: Beyond the Wood Section of the Bencao Gangmu, readers may consult the Shennong Bencao Jing (Divine Farmer's Classic of Materia Medica) for the original records of relevant medicinals across its three grades (upper, middle, lower). The Herb Section and Fruit Section of the Bencao Gangmu complement the Wood Section in many ways—for example, poria and amber are found in the Wood Section, while goji berry and sour jujube seed also appear in the Fruit Section. The Bencao Qiuzhen (Materia Medica Seeking Truth) and Bencao Beiyao (Essentials of Materia Medica) provide further systematizations of the pharmacological theory of the Wood Section.
This content is based on classical Chinese medical texts and is provided solely for traditional cultural study and scholarly reading. It does not constitute any medical diagnosis, medication recommendation, or treatment advice; if you are unwell, please seek timely medical attention.
