一本而众枝贯之。茎叶如凤尾。故草名凤尾。根名贯众。贯节贯渠。渠者魁也。根直
多枝。皮黑肉赤。三八月采之。曲者名草鸱头。其根曲而有尖嘴。黑须丛簇似狗脊而大。状
如伏鸱。
气叶苦。微寒。有毒。主治腹中邪热气。诸毒。解斑疹毒。杀三虫。治衄血下血。崩中
带下。产后血气胀痛。（皆泄热散结之功）根汁解毒软坚。能制三黄。化五金。伏钟乳结砂。
制汞。海藏治夏月痘出不快。（怏斑散中用之）云贯众有毒。而能解腹中邪热之毒。病因内
感而发之于外者多效。非古法之分经也。为末。水服一钱。或煎浓汁连服。治鱼肋骨鲠。为
细末。水调一钱匙。治鼻衄。疫气发时。以此药置水中。令人饮此水。则不传染。荒年以煮
黑豆。服豆便可食百草木枝叶。诸般下血。肠风酒痢。血痔鼠痔下血。黑狗脊（须内肉赤色
者即贯众也）去皮毛。锉焙为末。每服二钱。空心米饮下。或醋糊丸梧子大。每米饮下三四
十丸。女子血崩。贯众半两。煎酒饮之。立止。赤白带下。年深诸药不效者。贯众一个全用。
不锉。只揉去毛及花萼。以好醋蘸湿。慢火炙令香熟。候冷为末。空心米饮。每服二钱。甚
效。
〔论〕贯众多生山阴近水处。冬夏不死。且百叶俱贯于一根。禀阴之浓而能撤诸阳之毒
以出于外。故遇毒热则无不解。而多治血病也。绎海藏所云。非古分经之法。可以知其功之
所及。并其所不及。盖分经乃人物阴阳相为对待而酌治之理。兹味但解邪热之毒。为其性之
所独禀而已。
一根茎上贯穿着许多枝条。茎叶形状像凤凰的尾巴，因此草名为“凤尾”。根部名为“贯众”，意为贯穿节段和枝干。“渠”通“魁”，指首领或主干。根部笔直且多分枝，外皮黑色，内部肉质红色。在三月和八月采集。弯曲的称为“草鸱头”，其根弯曲且有尖嘴，黑色的须丛聚簇生，类似狗脊但体型较大，形状像伏着的猫头鹰。
气味苦，性微寒，有毒。主治腹中的邪热之气和各种毒邪。能解除斑疹之毒，杀灭三虫（蛔虫、蛲虫、绦虫等寄生虫）。治疗鼻出血和下血，以及崩漏（非经期大量阴道出血）和带下病。（这些功效都源于其泄热散结的作用）。根汁能解毒软坚，能够制约黄芩、黄连、黄柏（三黄），化解五金矿物，抑制钟乳石形成的砂结，控制汞毒性。海藏（张元素）用于治疗夏季痘疮发出不畅的情况（在怏斑散中使用）。有人说贯众有毒，却能解除腹中邪热之毒，对于因内感而外发的病症大多有效，这并非古代按经络辨证的方法。将其研成粉末，用水送服一钱，或者煎煮浓汁连续服用，可治疗鱼骨卡喉。研为细末，用水调服一钱匙，可治鼻出血。瘟疫流行时，将此药放入水中，让人饮用此水，则不会传染。荒年时用黑豆煮贯众，吃豆渣后可以食用各种草木枝叶。治疗各种下血、肠风便血、酒痢、血痔、鼠痔下血。黑狗脊（如果内部肉质呈红色即为贯众），去掉皮毛，切碎焙干研末。每次服用二钱，空腹用米汤送下。或者用醋糊制成梧桐子大小的丸剂，每次用米汤送服三四十丸。女子血崩，用半两贯众，煎酒后饮用，立即止血。赤白带下，多年其他药物无效者，取一个完整的贯众，不切碎，只揉去毛及花萼，用好醋蘸湿，用慢火炙烤至香熟，冷却后研末，空腹用米汤送服，每次二钱，效果很好。
〔论述〕贯众多生长在山的背阴面靠近水源的地方，冬夏都不枯萎。而且百片叶子都贯穿在一根茎上，禀受浓厚的阴气，因而能撤除诸阳之毒并使其发散于外。所以遇到毒热病症没有不能解除的，因此多用于治疗血病。推究海藏所说的“并非古代分经之法”，可以知道其功效的范围以及所不及之处。大概分经辨证是依据人物阴阳相互对待而斟酌治疗的道理，而这种药只是单纯地解除邪热之毒，这是由其独特的药性禀赋决定的。
One stem penetrates numerous branches. The stems and leaves resemble the tail of a phoenix; hence the herb is named "Fengwei" (Phoenix Tail). The root is named "Guanzhong" (Crowberry Rhizome), meaning it penetrates the nodes and channels. "Qu" refers to the chief or main trunk. The root is straight with many branches, black on the skin and red inside. It is harvested in the third and eighth lunar months. Those that are curved are called "Caochitou" (Grass Owl Head); their roots are curved with a pointed beak, with black fibers clustered like those of *Dryopteris crassirhizoma* (Gouji) but larger, resembling a crouching owl.
The odor and flavor are bitter, the nature is slightly cold, and it is toxic. It primarily treats evil heat qi in the abdomen and various toxins. It resolves toxicity from macules and papules, kills three types of parasites, and treats epistaxis and lower bleeding, as well as metrorrhagia (profuse uterine bleeding) and leukorrhea. (These effects stem from its ability to drain heat and dissipate nodules). The root juice detoxifies and softens hardness, can restrain Sanhuang (the three yellows: Scutellariae Radix, Coptidis Rhizoma, Phellodendri Cortex), dissolve five metals, subdue calcareous concretions from *Concha Ostreae* (Oyster Shell) or *Lapis Glaucconitis*, and control mercury toxicity. Haicang (Zhang Yuansu) used it to treat slow eruption of smallpox in summer (used in *Kuangban San*). Some say Guanzhong is toxic yet can resolve the toxicity of evil heat in the abdomen; it is effective for conditions manifesting externally due to internal infection, which differs from the ancient method of channel differentiation. Powdered, taken with water (1 qian), or decocted into a strong liquid and taken continuously, it treats fish bone impaction in the throat. Finely powdered, mixed with water and taken (1 qian spoon), it treats epistaxis. During epidemic outbreaks, placing this herb in water for people to drink prevents transmission. In years of famine, boiling black beans with Guanzhong allows one to consume various grass and tree leaves after eating the bean residue. It treats various lower bleeds, intestinal wind diarrhea, alcoholic dysentery, bloody hemorrhoids, and rat hemorrhoid bleeding. Hei Gouji (if the inner flesh is red, it is Guanzhong) has its hairs removed, is chopped, roasted, and powdered. Take 2 qian per dose, swallowed with rice water on an empty stomach. Alternatively, made into pills the size of wu zi using vinegar paste, take 30-40 pills with rice water. For female metrorrhagia, decoct half a liang of Guanzhong in wine and drink it to stop bleeding immediately. For chronic leukorrhea unresponsive to other medicines, use one whole Guanzhong without chopping; rub off the hairs and calyxes, moisten with good vinegar, roast slowly over low fire until fragrant and cooked, cool, powder, and take 2 qian with rice water on an empty stomach; it is very effective.
[Discussion] Guanzhong grows mostly in shady mountain areas near water and does not die in winter or summer. Moreover, hundreds of leaves penetrate through a single root, inheriting dense yin energy, thereby withdrawing the toxicity of various yang pathogens and expelling them outward. Thus, it can resolve toxic heat without exception and is often used to treat blood diseases. Analyzing Haicang's statement that it is "not the ancient method of channel differentiation," one can understand the scope and limitations of its efficacy. Channel differentiation is based on the principle of treating patients by balancing yin and yang interactions; this herb merely resolves the toxicity of evil heat, which is due to its unique inherent properties.