Introduction of Bai Zhu: White Atractylodes Rhizome
✵The article documents the herb White Atractylodes Rhizome—including its English name, Latin name, Pinyin name, property and flavors, botanical source—Atractylodes macrocephala Koidz.—and a detailed description of the plant’s botanical features, growth characteristics, ecological environment, characteristics of the herb, pharmacological actions, medicinal efficacy, and administration guidelines.
Pinyin Name: Bái Zhú
English Name: White Atractylodes Rhizome; Largehead Atractylodes Rhizome
Latin Name:Rhizoma Atractylodis Macrocephalae Property and Flavors: Warm; bitter, sweet.
Brief Introduction:Rhizoma Atractylodis Macrocephalae is the dried rhizome of Atractylodes macrocephala Koidz. It is used to: (1) replenish Qi and strengthen the spleen—indicated for general weakness, anorexia, dyspepsia, and chronic diarrhea; (2) relieve spontaneous sweating; and (3) stabilize the fetus in cases of threatened abortion. Common names include Rhizoma Atractylodis Macrocephalae, Largehead Atractylodes Rhizome, White Atractylodes Rhizome, and Bái Zhú.
Botanical Source: Classical Chinese herbal texts define White Atractylodes Rhizome (Bái Zhú) as the dried root and rhizome of Atractylodes macrocephala Koidz. (syn. Atractylis macrocephala (Koidz.) Hand.-Mazz.), a species of the genus Atractylodes DC., family Asteraceae (Compositae; aster or daisy family), order Asterales (Campanulales in past). This is the sole authenticated source species for the herb.
(1) Atractylodes macrocephala Koidz.
Botanical Description:Atractylodes macrocephala Koidz. is a perennial herb of the Asteraceae family and Atractylodes genus, also known as Atractylis macrocephala (Koidz.) Hand.-Mazz., Bái Zhú, or Yú Zhú. Rhizomes are thickened, tuberous, and irregularly lumpy. Stems reach 50–80 cm in height; the upper portion is branched, and the basal portion becomes lignified. Lower stem leaves are long-petiolate and either 3-lobed or pinnately 5-parted; lobes are ovate-lanceolate to lanceolate, 5–8 cm long and 1.5–3 cm wide; apex is long-acuminate; base is attenuate; margins bear long or short needle-like teeth, sometimes spiny-toothed and appressed; apical lobes are larger. Upper stem leaves have progressively shorter petioles; blades are narrowly lanceolate, entire or shallowly lobed, 4–10 cm long and 1.5–4 cm wide.
Capitula (flower heads) are solitary, terminal, approximately 2.5 cm long and 3.5 cm wide. Basal bracts are foliaceous, 3–5 cm long, with pinnately lobed, spinose margins. Phyllaries are in 5–8 layers, membranous and imbricate; outer phyllaries are slightly puberulent, short, ovoid, with obtuse apices; inner phyllaries are numerous, multiseriate, elongated, and obtuse. Florets are all tubular (tubiform); corollas are violet-red, ~1.5 cm long; 5 stamens; style is slender and elongated.
Achenes are oblong-elliptic, densely covered with yellowish-white tomentum, slightly oblate (~7.5 mm long). Pappus is ~1.3 cm long, pinnate, dirty white, with connate bases. Flowering occurs from September to October; fruiting from October to December.
Ecological Environment:Atractylodes macrocephala Koidz. grows naturally in mountainous and hilly regions; wild populations are now extremely rare. It is predominantly cultivated today.
Growth Characteristics:Atractylodes macrocephala Koidz. prefers cool, temperate climates and exhibits moderate cold tolerance but is sensitive to high temperature and humidity, as well as prolonged drought. It tolerates temperatures down to −10 °C (14 °F); growth is inhibited above 30 °C (86 °F) and optimal between 25–30 °C (77–86 °F). Rhizome development is most vigorous at 26–28 °C (78.8–82.4 °F); seed germination is optimal at 25–30 °C (77–86 °F). Cultivation requires well-drained, deep, loose, fertile sandy loam on elevated, sloping hillside fields. Continuous cropping must be avoided; newly reclaimed land is preferred. If replanted on previously cultivated land, a minimum interval of five years is required to reduce disease risk—especially southern blight (Phytophthora nicotianae). Crop rotation should favor Gramineae (grasses); rotation with Brassicaceae (Cruciferae) or Solanaceae (nightshades) is discouraged due to shared pathogen susceptibility.
Characteristics of the Herb: The rhizomes are irregular, hypertrophic lumps and blocks, 3–13 cm in length and 1.5–7 cm in diameter. The surface is sallow (grayish-yellow) or taupe-brown, bearing tubercles (tubercules, nodular protrusions), intermittent vertical wrinkles and grooves, fibrous root scars, and residual vegetative stem bases and bud scars at the apical end. The texture is firm and hard, not easily broken; the fracture surface is uneven, yellowish-white to hazel (pale brown), with scattered brownish-yellow, dot-like oil chambers. In oven-dried specimens, the fracture surface is keratose and dark-colored, sometimes fissured. The herb has a delicate fragrance, tastes sweet and slightly pungent, and feels slightly sticky when chewed.
Pharmacological Actions: (1) Effect on gastrointestinal motility; (2) Inhibitory effect on uterine smooth muscle; (3) Anti-aging effect; (4) Diuretic effect; (5) Antibacterial effect—against Epidermophyton floccosum, Streptomyces nocardioides, Neisseria meningitidis, Salmonella typhi, Salmonella paratyphi A, Shigella flexneri, Escherichia coli, and Pseudomonas aeruginosa; however, it exhibits no antiseptic activity.
Medicinal Efficacy: Tonifying the spleen and replenishing Qi, strengthening the spleen, resolving dampness and alleviating water retention, regulating the middle energizer, arresting spontaneous sweating, and stabilizing the fetus. It is indicated for spleen deficiency with poor appetite, Qi deficiency of the spleen and stomach, anorexia (no appetite or poor appetite), anorexia and lower abdomen distension, fatigue and shortness of breath, abdominal distension and diarrhea, loose stools, deficient-type distension, phlegm-damp retention, dizziness and palpitations, fluid retention stagnating in the interior, jaundice, arthralgia with fixed pain due to dampness, warm-arthralgia and aching pain, dysuria (difficulty in urination), edema, spontaneous sweating, spontaneous sweating due to Qi deficiency, and fetal restlessness.
Administration of Rhizoma Atractylodis Macrocephalae (Bái Zhú):
Reference:
Administration Guide for Rhizoma Atractylodis Macrocephalae (Bái Zhú)
TCM Books:
(1) Internally: 6–12 grams; (2) Internally: Water decoction, 1.5–3 qián (≈4.5–9 grams); or prepared as an ointment, pill, or powder; (3) Internally: Water decoction, 3–15 grams; or prepared as an ointment, pill, or powder.
Contraindications, Precautions, and Adverse Reactions: Rhizoma Atractylodis Macrocephalae is contraindicated with peach (peach kernel), plum (plum kernel), Sōng Cài (Chinese cabbage: leaves of Brassica chinensis L), Què Ròu (meat of sparrow), and Qīng Yú (black carp, Mylopharyngodon piceus).
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1. Introduction of Bai Zhu: White Atractylodes Rhizome
✵The article documents the herb White Atractylodes Rhizome—including its English name, Latin name, Pinyin name, property and flavors, botanical source—Atractylodes macrocephala Koidz.—and a detailed description of the plant’s botanical features, growth characteristics, ecological environment, characteristics of the herb, pharmacological actions, medicinal efficacy, and administration guidelines.
Pinyin Name: Bái Zhú
Botanical Description: Atractylodes macrocephala Koidz. is a perennial herb of the Asteraceae family and Atractylodes genus, also known as Atractylis macrocephala (Koidz.) Hand.-Mazz., Bái Zhú, or Yú Zhú. Rhizomes are thickened, tuberous, and irregularly lumpy. Stems reach 50–80 cm in height; the upper portion is branched, and the basal portion becomes lignified. Lower stem leaves are long-petiolate and either 3-lobed or pinnately 5-parted; lobes are ovate-lanceolate to lanceolate, 5–8 cm long and 1.5–3 cm wide; apex is long-acuminate; base is attenuate; margins bear long or short needle-like teeth, sometimes spiny-toothed and appressed; apical lobes are larger. Upper stem leaves have progressively shorter petioles; blades are narrowly lanceolate, entire or shallowly lobed, 4–10 cm long and 1.5–4 cm wide.
Capitula (flower heads) are solitary, terminal, approximately 2.5 cm long and 3.5 cm wide. Basal bracts are foliaceous, 3–5 cm long, with pinnately lobed, spinose margins. Phyllaries are in 5–8 layers, membranous and imbricate; outer phyllaries are slightly puberulent, short, ovoid, with obtuse apices; inner phyllaries are numerous, multiseriate, elongated, and obtuse. Florets are all tubular (tubiform); corollas are violet-red, ~1.5 cm long; 5 stamens; style is slender and elongated.
Achenes are oblong-elliptic, densely covered with yellowish-white tomentum, slightly oblate (~7.5 mm long). Pappus is ~1.3 cm long, pinnate, dirty white, with connate bases. Flowering occurs from September to October; fruiting from October to December.
Growth Characteristics: Atractylodes macrocephala Koidz. prefers cool, temperate climates and exhibits moderate cold tolerance but is sensitive to high temperature and humidity, as well as prolonged drought. It tolerates temperatures down to −10 °C (14 °F); growth is inhibited above 30 °C (86 °F) and optimal between 25–30 °C (77–86 °F). Rhizome development is most vigorous at 26–28 °C (78.8–82.4 °F); seed germination is optimal at 25–30 °C (77–86 °F). Cultivation requires well-drained, deep, loose, fertile sandy loam on elevated, sloping hillside fields. Continuous cropping must be avoided; newly reclaimed land is preferred. If replanted on previously cultivated land, a minimum interval of five years is required to reduce disease risk—especially southern blight (Phytophthora nicotianae). Crop rotation should favor Gramineae (grasses); rotation with Brassicaceae (Cruciferae) or Solanaceae (nightshades) is discouraged due to shared pathogen susceptibility.
Characteristics of the Herb: The rhizomes are irregular, hypertrophic lumps and blocks, 3–13 cm in length and 1.5–7 cm in diameter. The surface is sallow (grayish-yellow) or taupe-brown, bearing tubercles (tubercules, nodular protrusions), intermittent vertical wrinkles and grooves, fibrous root scars, and residual vegetative stem bases and bud scars at the apical end. The texture is firm and hard, not easily broken; the fracture surface is uneven, yellowish-white to hazel (pale brown), with scattered brownish-yellow, dot-like oil chambers. In oven-dried specimens, the fracture surface is keratose and dark-colored, sometimes fissured. The herb has a delicate fragrance, tastes sweet and slightly pungent, and feels slightly sticky when chewed.
Pharmacological Actions: (1) Effect on gastrointestinal motility; (2) Inhibitory effect on uterine smooth muscle; (3) Anti-aging effect; (4) Diuretic effect; (5) Antibacterial effect—against Epidermophyton floccosum, Streptomyces nocardioides, Neisseria meningitidis, Salmonella typhi, Salmonella paratyphi A, Shigella flexneri, Escherichia coli, and Pseudomonas aeruginosa; however, it exhibits no antiseptic activity.
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