（《拾遗》）
【释名】虎子桐（《拾遗》）、荏桐（《衍义》）
时珍曰∶罂子，因实状似罂也。虎子，以其毒也。荏者，言其油似荏油也。
【集解】藏器曰∶罂子桐生山中。树似梧桐。
颂曰∶南人作油者，乃冈桐也。有子大于梧子。
宗 曰∶荏桐，早春先开淡红花，状如鼓子花，成筒子。子可作桐油。
时珍曰∶冈桐即白桐之紫花者。油桐枝、干、花、叶并类冈桐而小，树长亦迟，花
亦微红。
但其实大而圆，每实中有二子或四子，大如大风子。其肉白色，味甘而吐人。亦或谓之
紫花桐。人多种莳收子，货之为油，入漆家及 船用，为时所须。人多伪之，惟以篾圈蘸起
如鼓面者为真。
桐子油
【气味】甘、微辛，寒，有大毒。
大明曰∶冷，微毒。时珍曰∶桐油吐人，得酒即解。
【主治】摩疥癣虫疮毒肿。毒鼠至死（藏器）。敷恶疮，及宣水肿，涂鼠咬处。能辟鼠
（大
明）。涂胫疮、汤火伤疮。吐风痰喉痹，及一切诸疾，以水和油，扫入喉中探吐；或以子研
末，吹入喉中取吐。又点灯烧铜箸头，烙风热烂眼，亦妙（时珍）。
【附方】新七。
痈肿初起∶桐油点灯，入竹筒内熏之，得出黄水即消。（《医林正宗》）。
血风 疮∶胡粉 过研，桐油调作隔纸膏，贴之。又方∶用船上陈桐油锻石 过，又以
人发拌桐油炙干为末，仍以桐油调作膏，涂纸上，刺孔贴之。（杨起《简便方》）。
脚肚风疮如癞∶桐油、人乳等分，扫之。数次即愈。（《集简方》）。
酒渣赤鼻∶桐油入黄丹、雄黄，敷之。（《摘玄方》）。
冻疮皲裂∶桐油一碗，发一握。熬化瓶收。每
解砒石毒∶桐油二升，灌之。吐即毒解。（华佗危病方）
【附录】KT 桐（音而郢切）
藏器曰∶生山谷间。状似青桐，叶有丫。人取皮以沤丝。木皮味甘，温，无毒。治蚕
咬毒瓦斯入腹，末服之。鸡犬食蚕欲死者，煎汁灌之，丝烂即愈。叶∶主蛇、虫、蜘蛛咬毒，
捣烂封之。
(From *Kaibao Bencao Shiyi*)
[Names] Huzitong (Tiger Poplar) (*Kaibao Bencao Shiyi*), Ren Tong (*Jiayou Buzhu Shen Nong Bencao Yan Yi*).
Li Shizhen stated: "Yingzi" is named because the fruit resembles a small jar. "Huzi" refers to its toxicity. "Ren" indicates that its oil resembles Ren oil (Perilla seed oil).
[Collection of Explanations] Chen Cangqi stated: Yingzitong grows in mountains. The tree resembles the Wutong tree (Firmiana simplex).
Su Song stated: The species used by people in the south for oil production is Gangtong. Its seeds are larger than those of Wutong.
Kou Zongshi stated: Rentong blooms with pale red flowers early in spring, resembling Drum Flower (Pharbitis nil), forming cylindrical fruits. The seeds can be used to make Tung oil.
Li Shizhen stated: Gangtong is the purple-flowered variety of Baotong (White Poplar). The branches, trunk, flowers, and leaves of Oiltung (Vernicia fordii) resemble Gangtong but are smaller; the trees grow slowly, and the flowers are slightly red.
However, the actual fruits are large and round, containing two or four seeds per fruit, similar in size to Croton seeds (Croton tiglium). The flesh is white, tastes sweet, but induces vomiting. It is also sometimes called Purple-flowered Poplar. People widely cultivate it to harvest seeds for selling as oil, which is required by lacquer makers and shipbuilders, making it a commodity of the time. People often counterfeit it; only those that form a smooth, drum-head-like surface when dipped with a bamboo hoop are genuine.
Tung Seed Oil
[Properties and Flavors] Sweet, slightly pungent, cold in nature, highly toxic.
Tang Shenwei (Da Ming) stated: Cold in nature, slightly toxic. Li Shizhen stated: Tung oil induces vomiting; drinking wine can resolve the toxicity.
[Indications] Apply topically to treat scabies, tinea, insect sores, and toxic swellings. Can kill rats upon poisoning (Chen Cangqi). Apply to malignant sores, to promote the resolution of edema, and to apply to rat bites. Can repel rats (Tang Shenwei). Apply to leg ulcers, burns, and scalds. Induce vomiting for wind-phlegm causing throat obstruction (hou bi), and for various other diseases: mix the oil with water, sweep into the throat to provoke vomiting; or grind the seeds into powder and insufflate into the throat to induce vomiting. Alternatively, light a lamp wick with copper chopsticks, heat the tip, and cauterize eyes suffering from wind-heat induced ulceration, which is also effective (Li Shizhen).
[Attached Prescriptions] Seven new prescriptions.
Early-stage carbuncle and swelling: Light a lamp with tung oil, place inside a bamboo tube, and fumigate the affected area. Discharge of yellow fluid indicates resolution (*Yilin Zhengzong*).
Blood-wind sore: Grind lead carbonate (Hu Fen) finely, mix with tung oil to make a paper-interposed plaster, and apply. Another method: Use aged tung oil from boats mixed with calcined iron ore (Duanshi), then mix human hair with tung oil, roast until dry, and grind into powder. Still use tung oil to make a paste, apply on paper, prick holes, and apply to the lesion (Yang Qi, *Jianbian Fang*).
Wind-sore on calf resembling leprosy: Mix equal parts of tung oil and human milk, and apply. Heal after several applications (*Jijian Fang*).
Rosacea (red nose): Mix tung oil with minium (Hong Dan) and realgar (Xiong Huang), and apply (*Zhai Xuan Fang*).
Chilblains and fissures: One bowl of tung oil, one handful of hair. Boil until melted and store in a bottle. [Text incomplete]. To resolve arsenic poison: Administer two sheng of tung oil orally. Vomiting resolves the poison (Hua Tuo, *Weibing Fang*).
[Appendix] KT Tong (Pronunciation: 'Er Ying' cut)
Chen Cangqi stated: Grows in valleys. Resembles Qingtong (Green Poplar), leaves have lobes. People take the bark to soak silk fibers. The bark is sweet, warm, non-toxic. Treats venom entering the abdomen from silkworm bites; take powdered form orally. If chickens or dogs eat silkworms and are dying, decoct the juice and administer; recovery occurs when the silk rots. Leaves: Treat snake, insect, and spider bites; crush and apply externally.