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Nature and flavor: Slightly cold. Indications: Mainly treats facial, ocular, and generalized lacquer dermatitis (allergic contact dermatitis caused by exposure to lacquer tree).

Tao Hongjing stated: It is found everywhere. People from the north (Cang people) take the stems and eat them raw. It is harvested on the fifth day of the fifth lunar month and dried in the sun. Burned into ash, it is used to treat metal weapon wounds (Jin Chuang), with very effective results. The *Tang Bencao* annotation states: Nowadays, people mistake it for *Euphorbia humifusa* (Loulou), which is incorrect. Minister Yuxi et al. respectfully note: The *Shu Ben Tu Jing* records that the seeds resemble those of *Cirsium japonicum* (Maoji). The stem is round and thornless. The seedlings are harvested in May and can be eaten raw; they are found in low, wet areas everywhere. *Yao Xing Lun* states: Ku Cao (Bitter Grass) can also be used alone; it tastes bitter and is non-toxic. Ri Huazi stated: It is cold in nature and treats erysipelas (Dan Du).

*Shi Liao Ben Cao* states: Ku Cao (Bitter Grass) is slightly cold. Eating it raw treats lacquer dermatitis. Harvested on the fifth day of the fifth lunar month and dried in the sun. Burned into ash and applied to facial and generalized lacquer dermatitis, but it should not be consumed in large quantities.

Oxalis corniculata (Cujiangcao)
Flavor: Sour. Nature: Cold. Non-toxic. Indications: Mainly treats malignant sores. Crushed and applied externally, it kills various small insects. Grows alongside roads.

The *Tang Bencao* annotation states: The leaves resemble tiny duckweed, growing in clusters, with three leaflets at the stem tip. Also known as Cu Mu Cao (Vinegar Mother Grass) and Jiu Suan Cao (Dove Sour Grass). According to other version annotations: It grows in shady, wet places and is commonly called Xiao Suan Mao (Little Sour Rush). Consuming it relieves heat and thirst. Harvested in April and May and dried in the shade. (This entry was originally attached in the *Tang Bencao*). Minister Yuxi et al. respectfully note: The *Shu Ben Tu Jing* states: Oxalis corniculata (Cujiangcao), commonly called Suan Jiang, does not list its place of origin in older texts, stating it grows by the roadside. Now, it is abundant in low, wet areas in the south and in household gardens, and also grows in northern regions. The leaves resemble water duckweed, growing in clusters, with three leaflets at the stem tip. Fine yellow flowers grow among the leaves, and the fruits are black. Leaves are harvested in summer for use. When young and tender, children often eat them. Southerners use it to rub stone tools, making them white as silver.

Flavor: Sour. Nature: Neutral. Non-toxic. Indications: Mainly treats dryness and pain in the mouth, bloody dysentery from food and water, and stops bleeding. Grows on roofs in Shangdang region, resembling young Artemisia capillaris (Peng Cao), also known as Wa Song (Tile Pine). Harvested in summer and dried.

The *Tang Bencao* annotation states: The leaves resemble Peng Cao, growing over a chi high. From a distance, it looks like planted pines, growing on old tiled roofs. According to other version annotations: It is now found everywhere and all parts are used in medicine. Its primary use is mixed with eyebrow and hair ointment. (This entry was originally attached in the *Tang Bencao*). Minister Yuxi et al. respectfully note: The *Shu Ben Tu Jing* states: The herbs are harvested in June and July and dried.

*Shenghui Fang* treats head wind with white dandruff. Use Wa Song (Tile Pine) dried in the sun, burned to ash, and leached with water to obtain juice. Wash the head with the hot juice; no more than six or seven times are needed.