即牡荆
防己为之使。畏石膏。
苦、微辛。入手少阴经。治心风、头风，肢体诸风，解肌发汗。用叶并嫩头捣烂，罨毒
蛇螫
伤，洪肿发泡。（捣取汁频涂，亦效。）配荆芥、荜茇，煎水，漱风牙痛。
辛、甘。入手少阴经。除风热，开经络，导痰涎，行血气，止消渴，解热痢。治心闷
发热，头风旋运目眩，心头洋洋欲吐，中风失音，痰迷心窍，小儿心热惊痫。配竹沥、姜汁
，治风热、风痰。（气虚不能食者用淡竹沥，气实能食者用黄荆沥。）
取沥法∶用新采黄荆茎截尺余长，架于两砖上，中间烧火炙之，两头以器承取。热服，
或入
药中。令人不睡，气虚食少者忌用。
恶乌头、石膏。
辛、苦、微温。入足太阳、厥阴经气分。搜肝风，祛寒湿，除头痛，止睛疼，利九窍，
杀白虫，治湿痹拘挛，疗脑
鸣齿痛。配马蔺，治喉痹口噤。配蒺藜，治皮痹不仁。
去膜拷碎，酒蒸用，或酒拌炒用。胃虚，（服之恐致痰疾。）血虚头痛，二者禁用。
苦，寒。入足厥阴经血分。活血行气，消肿解毒。治经水凝涩，疗小便不通。配老酒，
治产后诸淋。酒拌炒用。
甘、滑、微寒。入手阳明、太阳经。润燥活血。治赤白带下，疗肠风久痢，除湿热，利
小便，擦顽癣，杀疮虫。擦
癣，肥皂水浸，或浸汁磨雄黄尤妙。
花
甘、平、滑。治症与根皮同。配糯米，治反胃吐食。
这就是牡荆。
防己是它的引经药（使药）。它畏惧石膏。
味道苦，略带辛味。归入手少阴心经。治疗心风、头风，以及肢体各种风邪病症，具有解肌发表发汗的功效。将叶片和嫩梢捣烂，敷在毒蛇咬伤处，可消除洪肿发泡。（捣取汁液频繁涂抹，也有效。）配伍荆芥、荜茇，煎水漱口，治疗风火牙痛。
味道辛、甘。归入手少阴心经。祛除风热，疏通经络，引导痰涎排出，运行血气，止消渴，解热痢。治疗心中烦闷发热，头风引起的眩晕目眩，心头泛泛欲吐，中风失音，痰迷心窍，小儿心热惊痫。配伍竹沥、姜汁，治疗风热、风痰。（气虚不能进食者用淡竹沥，气实能进食者用黄荆沥。）
取竹沥的方法：用新采的黄荆茎截成尺余长，架在两砖上，中间烧火炙烤，两头用器皿承接流出的汁液。热服，或加入药物中服用。令人不睡，气虚食少者忌用。
厌恶乌头、石膏。
味道辛、苦，微温。入足太阳膀胱经、厥阴肝经的气分。搜剔肝风，祛除湿寒，消除头痛，停止眼疼，通利九窍，杀死白虫，治疗湿痹拘挛，治疗脑鸣齿痛。配伍马蔺，治疗喉痹口噤。配伍蒺藜，治疗皮痹麻木不仁。
去掉膜壳敲碎，酒蒸后使用，或用酒拌炒后使用。胃虚者（服用恐怕导致痰疾），血虚头痛者，这两类人禁用。
味道苦，寒。入足厥阴肝经的血分。活血行气，消肿解毒。治疗月经凝涩不通，治疗小便不通。配伍老酒，治疗产后各种淋证。用酒拌炒后使用。
味道甘、滑，微寒。入手阳明大肠经、太阳膀胱经。润燥活血。治疗赤白带下，治疗肠风久痢，清除湿热，通利小便，擦拭顽癣，杀灭疮虫。擦癣时，用肥皂水浸泡，或用浸汁磨雄黄尤为奇妙。
花
味道甘、平、滑。功效与根皮相同。配伍糯米，治疗反胃吐食。
This is Vitex negundo (Mujing).
Puerariae Radix (Gegen) serves as its guiding herb (shi). It fears Gypsum Fibrosum (Shigao).
Bitter, slightly pungent. Enters the Hand-Shaoyin Heart Meridian. Treats heart wind, head wind, and various wind syndromes of the limbs; resolves the muscle layer and induces sweating. Crush the leaves and tender tips into a paste and apply to snakebites to reduce swelling and blistering. (Frequently applying the extracted juice is also effective.) Combined with Schizonepetae Herba (Jingjie) and Piperis Longi Fructus (Bibo), decocted in water for rinsing, it treats wind-fire toothache.
Pungent, sweet. Enters the Hand-Shaoyin Heart Meridian. Disperses wind-heat, opens the collaterals, guides out phlegm-saliva, promotes blood and qi circulation, stops xiao-ke (wasting-thirst), and resolves heat-dysentery. Treats mental oppression with fever, dizziness and vertigo due to head wind, nausea with a feeling of fullness in the heart, aphasia due to stroke, phlegm confusing the heart orifice, and pediatric heart-heat convulsive epilepsy. Combined with Bamboo Juice (Zhuli) and Ginger Juice (Jiangzhi), it treats wind-heat and wind-phlegm. (For those with qi deficiency unable to eat, use light bamboo juice; for those with excess qi able to eat, use Huangjing juice.)
Method for extracting juice: Use freshly harvested Huangjing stems cut to about one chi long, placed across two bricks, with fire burning underneath to roast them, collecting the exuded liquid at both ends with vessels. Take warm, or add to herbal preparations. It causes insomnia; contraindicated for those with qi deficiency and poor appetite.
Dislikes Aconiti Lateralis Radix Praeparata (Wutou) and Gypsum Fibrosum (Shigao).
Pungent, bitter, slightly warm. Enters the Qi aspect of the Foot-Taiyang Bladder Meridian and Foot-Jueyin Liver Meridian. Searches out liver wind, dispels cold-dampness, relieves headache, stops eye pain, unblocks the nine orifices, kills white worms, treats damp-bi with spasms and contracture, and cures tinnitus and toothache. Combined with Iris lactea var. chinensis (Malin), it treats throat obstruction with jaw stiffness. Combined with Tribuli Fructus (Jili), it treats skin bi with numbness.
Remove the membrane, crush, steam with wine for use, or stir-fry with wine. Contraindicated for those with stomach deficiency (may induce phlegm diseases) and blood-deficiency headache.
Bitter, cold. Enters the Blood aspect of the Foot-Jueyin Liver Meridian. Invigorates blood and moves qi, reduces swelling and detoxifies. Treats menstrual stasis and scantiness, and urinary retention. Combined with aged rice wine, it treats various lin-syndromes postpartum. Stir-fry with wine for use.
Sweet, slippery, slightly cold. Enters the Foot-Yangming Large Intestine Meridian and Foot-Taiyang Bladder Meridian. Moistens dryness and invigorates blood. Treats leukorrhea (red and white discharge), chronic dysentery due to intestinal wind, clears damp-heat, promotes urination, rubs on stubborn tinea corporis, and kills parasitic sores. For rubbing on tinea, soaking in soap water or grinding realgar (Xionghuang) with the soaked juice is particularly excellent.
Flower
Sweet, neutral, slippery. Efficacy is the same as the root bark. Combined with Oryza Sativa (Nuomi), it treats regurgitation and vomiting.