无毒附苗花根屋茅 丛生
茅根（出神农本经）主劳伤虚羸补中益气除瘀血血闭寒热利小便 苗主下水（以上朱字
神
农本经）下五淋除客热在肠胃止渴坚筋妇人崩中久服利人（以上黑字名医所录）【名】兰根 茹
根地管 地筋 兼杜【苗】（图经曰）春生苗布地如针俗谓之茅针可啖甚益小儿夏生白花
茸
茸然至秋而枯其根至洁白味亦甘美陆机草木疏云菅似茅而滑无毛根下五寸中有白粉者柔韧宜
为索沤之尤善其未沤者名野管诗所谓白茅菅兮是也入药功用与茅等其屋苫茅用之须经久者良
【地】（图经曰）生楚地山谷田野今处处有之（道地）澶州鼎州【时】（生）春生苗（采）四
月取花
六月取根【收】晒干【用】根花苗针【质】根类茅香根而粗【色】白【味】甘（茅针）甘（花）
甘【性】寒缓（茅针）平凉（花）温【气】气之薄者阳中之阴【臭】香【主】除瘀血下五淋
【制】
刷去沙土锉碎用【治】（疗）（日华子云）疗妇人月经不匀通血脉淋沥○茅针通小肠花 刀箭
疮止血并痛○屋四角茅止鼻洪（唐本注云）菅花止衄血吐血灸疮（药性论云）白茅破血并止
消渴
（
及暴下血【合治】合脂膏疗诸竹木刺在肉中不出及因风致肿○屋茅合酒煮疗卒吐血○屋上烂
茅和酱汁研敷斑疮蚕啮疮○茅针合酒煎服疗痈毒软疖不作头【禁】妊娠不可服【解】茅屋滴
溜水杀云母毒
Non-toxic. Attached: shoots, flowers, roots, thatch from roofs; grows in clumps.
Mao Gen (Rhizoma Imperatae) [Source: *Shennong Bencao Jing*] Mainly treats labor injury and emaciation, tonifies the middle and benefits qi, removes blood stasis, treats blood obstruction, alternating cold and fever, and promotes urination. (The above red text is cited from *Shennong Bencao Jing*).
The shoots mainly promote the downward movement of water, (The above red text is cited from *Shennong Bencao Jing*) treat five types of strangury (Wu Lin), clear pathogenic heat in the stomach and intestines, relieve thirst, strengthen sinews and bones, treat uterine bleeding (Beng Zhong), and are beneficial to the human body with long-term use. (The above black text is recorded by famous physicians).
[Names] Lan Gen, Ru Gen, Di Guan, Di Jin; also known as Du.
[Shoots] (*Tu Jing Ben Cao* states): In spring, shoots emerge spreading on the ground like needles, commonly called "Mao Zhen" (thatch needle), which is edible and very beneficial for children. In summer, white flowers appear, fluffy in appearance, withering in autumn. The roots are extremely white and have a sweet taste. Lu Ji's *Caomu Shu* says: Jiang grass resembles thatch but is smooth without hairs; the root has white powder within five inches below the surface, making it soft and tough, suitable for making ropes, especially after retting. Those not retted are called "Ye Guan," as mentioned in the *Classic of Poetry*: "White thatch and Jiang." Its medicinal efficacy is the same as Mao Gen. Thatch used for roofing must be stored for a long time to be of good quality.
[Origin] (*Tu Jing Ben Cao* states): Grows in valleys and fields of Chu region; now found everywhere. (Authentic origin areas): Chanzhou, Dingzhou.
[Season] (Growth) Shoots emerge in spring. (Harvest) Collect flowers in April, collect roots in June.
[Storage] Sun-dry.
[Medicinal Parts] Root, flower, shoot, needle.
[Texture] Similar to Mao Xiang Gen but thicker.
[Color] White.
[Taste] Sweet (Mao Zhen), Sweet (Flower), Sweet.
[Nature] Cold and mild (Mao Zhen), Neutral and cool (Flower), Warm.
[Qi] Thin Qi, Yin within Yang.
[Odor] Fragrant.
[Main Actions] Remove blood stasis, treat five types of strangury.
[Preparation] Brush off sand and soil, chop into pieces before use.
[Treatment] (*Ri Hua Zi Ben Cao* states): Treats irregular menstruation in women, unblocks blood vessels, treats dribbling strangury. ○ Mao Zhen unblocks the Small Intestine; Flowers stop bleeding and relieve pain in knife and arrow wounds. ○ Thatch from the four corners of a house stops epistaxis (Tang Ben Cao Zhu states) Jiang flowers stop nasal bleeding (Nu Xue) and hematemesis (Tu Xue), treat moxibustion sores (Yao Xing Lun states) Bai Mao breaks blood stasis and treats Xiao Ke (wasting-thirst syndrome) and sudden lower gastrointestinal bleeding.
[Combined Treatment] Combined with animal fat/grease to treat bamboo or wood splinters embedded in flesh that cannot be removed, and swelling caused by wind pathogens. ○ House thatch combined with wine decoction treats sudden hematemesis. ○ Rotten thatch from the roof combined with soy sauce paste applied externally treats macules/sores and insect bite lesions. ○ Mao Zhen combined with wine decoction treats carbuncles/toxins and soft boils without suppuration.
[Contraindications] Not to be taken during pregnancy.
[Antidote] Water dripping from thatched roofs can neutralize Yun Mu (mica) toxicity.