Introduction of Huang Yao Zi:Airpotato Yam Rhizome or Rhizoma Dioscoreae Bulbiferae.

TCM Herbalism:Medicinals and Classifications. ✵The article gives records of the herb Airpotato Yam Rhizome, its English name, Latin name, property and flavor, its botanical source one plant species, ①.Dioscorea bulbifera L., with a detailed introduction to the botanical features of this plant species, the growth characteristics, and ecological environment of this plant species, the features of the herb Airpotato Yam Rhizome, its pharmacological actions, medicinal efficacy, and administration guide.

Rhizoma Dioscoreae Bulbiferae(Airpotato Yam).

Dioscorea bulbifera:growing plant with fruit Pin Yin Name: Huánɡ Yào Zǐ.
 English Name: Airpotato Yam Rhizome.
 Latin Name: Rhizoma Dioscoreae Bulbiferae.
 Property and flavor: neutral in nature, bitter.

 Brief introduction: The herb Rhizoma Dioscoreae Bulbiferae is the dried rhizome of Dioscorea bulbifera L., used as a blood-cooling hemostatic for stopping various kinds of bleeding and to counteract toxins for treating boils and sores.

 Botanical source: The herb Rhizoma Dioscoreae Bulbiferae (Airpotato Yam) is the dried rhizome of Dioscorea bulbifera L., it is a plant of the Dioscorea. Genus, the Dioscoreaceae family (yam family) of the Liliflorae order. It is also known as Rhizoma Dioscoreae Bulbiferae, Airpotato Yam Rhizome or Huánɡ Yào Zǐ.

 Dioscorea bulbifera L.:growing plant with fruit Herbal classic book defined the herb Rhizoma Dioscoreae Bulbiferae(Airpotato Yam) as the dried rhizome of:(1). Dioscorea bulbifera L. This commonly used species is introduced:

(1).Dioscorea bulbifera L.

 Dioscorea bulbifera L.:growing plant with fruit Botanical description: Dioscorea bulbifera L is also known as Huang Du, Yu Ling Shu, Lei Gong Shu. A twining herbaceous-liana species. Stem tubers are ovoid to oblong, near to the soil surface, tan (chocolate brown), and many slender fibrous roots grow densely on the surface. Stem is cylindrical, sinistral, glabrous. Simple leaves are alternate; the petiole is slightly shorter than the blade; the leaf blade is broadly ovate-cordate or ovate-cordate, 5~16~26 cm long, 2~14~26 cm wide, the apex is caudate acuminate, the margin is entire or slightly wavy, both surfaces are glabrous; Leaf axils have purple-brown globular or ovoid beads of different sizes (bulbel), 1~3 cm in diameter, with rounded spots on the outside. Flowers are unisexual, and dioecious; Male inflorescence is spicate and pendulous, often several clusters in leaf axils, sometimes basal inflorescence elongated and arranged into panicles; Male flowers are solitary and dense, base with 2 ovate bracts; Tepals are lanceolate, purple when fresh; 6 stamens, inserted at base of the perianth, filaments are nearly equal length with anthers; Female inflorescence is similar to male inflorescence, often 2 to several clusters in leaf axils, 20~50 cm long, 6 staminodes, its length is about 1/4 of the perianth. Capsularfruit is reflexed and pendulous, prismatic-oblong, 1.5~3 cm long, 0.5~1.5 cm wide, round at both ends, yellowish (light yellow) when mature, dense purple spots grow on the surface. Seeds are dark brown, and oblate, usually growing twinned at the apex of the central axis of each cell, seed wing color is chestnut brown, extending toward the seeds, oblong. Its flowering period is from July to October, and fruiting from August to November.

 Dioscorea bulbifera L.:growing plant with fruit Ecological environment: The plant grows on the edge of a valley, gully, or edge of a shaw (holt or miscellaneous wood forest) at altitudes below 2,000 meters above sea level. Resource distribution: The plant is mainly distributed in the east, central and southern areas, southwest, northwest, Taiwan, and other areas of China.

 Growth characteristics: The plant prefers a warm and moist climate, resistant to shade. It is better to cultivate in the field with sufficient sunlight, a deep soil layer, and loose and fertile, sandy loam with good drainage.

 Characters of herbs: The herbs mostly are transverse thick slices, circular or orbicular, with a diameter of 2.5~7 cm and a thickness of 0.5~1.5 cm. The surface is brownish-black, shriveled, with numerous white, punctate protrusions fibrous root marks, or thin curving roots remaining, and the cork bark is easy to peel off; The cross surface is yellowish white to yellowish brown, flat or uneven (sags and crests). The texture of the herb is hard and brittle (crisp), easily broken, granular in the fracture surface, and scattered with orange-yellow pocking marks. The herb has a slight smell and bitter taste. The herb of better grade has a large slice, brown-black cortex, and yellow-white fracture surface.

 Pharmacological actions: ①.inhibit the myocardium; ②.inhibitory effect on the isolated intestine; ③.inhibit staphylococcus aureus and many kinds of dermatophytes; ④.inhibitory effect on tumor cells.

 Medicinal efficacy: Clear heat and detoxify, cool serum and clear galls, indicated for sore throat, carbuncle and ulcer, snake bite, goitre (goiter, thyroncus), vomiting blood, hemoptysis (spit blood).

 Administration of Airpotato Yam Rhizome (Huánɡ Yào Zǐ): 
Reference: Administration Guide of Airpotato Yam Rhizome (Huánɡ Yào Zǐ)
TCM Books: ①.Internally:3~9 grams; ②.Internally: water decoction, 1.5~3 qian (about 4.5~9 grams), Externally: mashed and apply stick, or prepare to finely ground herb powder and apply stick; ③.Internally: water decoction, 3~9 grams, or infused in wine, or prepare to finely ground herb powder, 1~2 grams. Externally: proper amount, mashed the fresh herb, or prepare to finely ground herb powder and apply stick, or extract juice and smear.
 Precautions and Adverse Reactions: should not take the herb Airpotato Yam Rhizome in big dose internally.

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