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Nature and flavor are neutral. It primarily treats malignant sores resulting from the overflow of sinews and vessels.

Tao Hongjing stated: Burning rush mats is an practice unique to boatmen, resembling a sail made of rush. The mats used in ordinary households are woven from *Gong* (Cyperus rotundus) grass, while the underlays are mostly made of rush, which is occasionally utilized in medical prescriptions. The annotation in *Tang Bencao* notes that "mat" (*xi*) and "underlay" (*jian*) are essentially the same; both are used for lying down, and those that have been long occupied by humans, thereby absorbing human *Qi*, are considered superior. In the Qingzhou and Qizhou regions, rush underlays are called "rush mats" or "rush covers," referring to items used as underlays. In Shannan and Jiangzuo, items woven on looms are called "mats," while thick, heavy layers beneath them are called "underlays." As stated in the *Classic*: preference should be given to those that have been lain upon by humans for a long time, regardless of whether they are classified as underlays or mats. Ministers Yuxi et al., according to *Yaoxing Lun*, noted that ruined rush mats can also be used alone. They treat blood stasis. For injuries from falling from heights causing stabbing pain due to abdominal blood stasis, ruined rush mats that have been slept on are effective. Taken together with *Puhuang* (Pollinis Typhae), *Chishao Yao* (Radix Paeoniae Rubra), *Danggui* (Radix Angelicae Sinensis), *Dahuang* (Radix et Rhizoma Rhei), and *Piaoxiao* (Natrii Sulfas), decocted and taken orally, the blood stasis will be expelled downward. Chen Cangqi stated: The cords woven into underlays treat spasms associated with Huoluan (Cholera). Burned into black ash, two finger-widths of the ash taken with wine is effective.

*Shenghui Fang*: Treats severe Huoluan with spasms nearing death. Take a handful of ruined rush mats, finely cut, and decoct in one cup of sour rice water. Drink warm in one dose.

*Waitai Miyao*: Treats abdominal blood accumulation following a fall. Take two qian of rush ash, taken with wine.

*Qianjin Fang*: Wuse Danshu (Five-Color Carbuncle), commonly known as Youzhong (Wandering Swelling), is often fatal if contracted and must not be underestimated. Burn rush mats to ash, mix with egg white, and apply topically.

*Shengjin Fang*: Treats blood rushing upward in women. Burn old ruined rush mats to ash, take two qian bi mixed with wine.

Shandougen
Flavor is sweet, nature is cold, non-toxic. It treats various drug poisonings, relieves pain, reduces carbuncles and swelling toxins, treats acute jaundice with fever and cough in humans and horses, and kills small insects. It grows in the valleys of Jiannan Mountain. Its vines resemble legumes. (Added currently)

*Tujing* states: Shandougen grows in the valleys of Jiannan Mountain; it is now also produced in Guangxi, with the best quality coming from Zhongzhou and Wanzhou. The vines resemble legumes, and the root takes its name from this. The leaves are green and do not wither through winter; the roots are harvested in August. Currently, people cut them into inch-length segments and hold them in the mouth to relieve sore throat and swelling, which is extremely effective. In Guangnan, Shandougen resembles small locust trees, over a chi high; stone rats eat their roots. Therefore, people in Lingnan capture stone rats, dissect them to extract the intestines and stomach, and dry them. It is very effective in resolving toxicity and attacking heat.

*Jingyan Fang*: A Shandougen formula for emergency treatment of all diseases: Use Shandoudougen in any quantity, treating according to the following conditions. 1. Detoxification: For Gu Du (Gu Poison), secretly have someone grind it with water, enforce silence, and take a small amount; if symptoms persist, take again. For Tuo Chuang (Scalp Ringworm), grind with water and apply to the lesion. For Hou Tong (Sore Throat), hold a slice in the mouth and swallow saliva slowly. For Wu Zhong (Five Types of Hemorrhoids), grind with water and take orally. For Chi Tong (Toothache), hold a slice at the painful site. For Fu Dou Deng Chuang (Sores like bran/beans), grind with water and take a small amount. For Tou Feng (Head Wind/Migraine), grind into powder, mix with oil, and apply. For Chi Bai Li (Dysentery with red and white discharge), grind into powder, make honey pills, and take twenty pills with decocted water on an empty stomach; three doses will stop it. For Zhang Fu Man Chuan Men (Abdominal distension, fullness, wheezing, and oppression), take a small amount of powder, mix with decocted water, drink one cup, and recover. For Chuang Xuan (Sores and Tinea), grind into powder, mix with pig fat from the twelfth lunar month, and apply. For Tou Shang Bai Xie (White flakes on the head), grind into powder, soak in oil, and apply. For children, mix half qian with milk. For Su Leng Chong (Old Cold Parasites) and Cun Bai Chong (Tapeworm), take three qian mixed with hot wine on an empty stomach every morning; the parasites will naturally exit. For Wu Ban Ji Huang (Five Types of Acute Jaundice), take two qian mixed with water on an empty stomach. For Zhan Qi, take two qian with wine. For Huoluan, take three qian with Tangerine Peel Decoction. For Re Zhong (Heat Swelling), grind with water to make a thick juice, apply topically, and reapply when dry. For women with Blood Qi Abdominal Swelling, take three qian of powder with hot wine (not on an empty stomach). For sudden abdominal pain, grind with water to make half a cup, ingest, and recover immediately. For Spider Bites, mix with saliva and apply. For Dog Bites, Pi Fu Chuang (Ant Sores), and Snake Bites, grind with water and apply.