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Guanzhong is the dried rhizome with petiole base of Dryopteris crassirhizoma Nakai, pertaining to Dryopteridaceae. It is collected in fall. After the petiole base and fibrous root are removed, it is sun dried. The raw for is used or afer stir-baked to charcoal.

[ Medicinal Properties ]: Bitter and slightly cold. Slightly toxic; relate to liver and stomach meridians..

[ Medicinal Efficacies ]: Clear heat, relieve toxicity; cool blood and stop bleeding; kill worms.

[ Usage and Dosage ]: 4.5-9g. It is stir-baked to charcoal to stop bleeding. Also it is used externally.

[ Precautions ]: For it is slightly toxic, avoid using in large dosage. Be cautious with deficiency-cold of spleen and stomach or pregnant woman.

[ Clinical Applications ]: 1. External contraction of wind-heat, warm toxinosis and toxin      By itself, it treats external contraction of wind-heat or combined with Sangye and Jinyinhua. Also it treats mumps, macula and rash, combined with Banlangen, Daqingye and Zicao.

2. Blood heat and  bleeding    It treats various bleeding due to blood heat such as epistaxic, heametemesis hematiochezia, metrorrhagia and metrostaxis, especially good at metrorhagia and metrostaxis. By itself it treats epistaxis by pounded into powder. For hematochezia, it is combined with Cebaiye. And for metrorrhagia and etrostaxis, it is combined with Wulingzhi.

3. Helminthic accumulation and abdominal pain    It can kill various interstinal parasites such as tapeworm, hookworm, threadworm and roundworm, usually combined with other vermifugal medicinal.

贯众为鳞毛蕨科植物粗茎鳞毛蕨Dryopteris crassirhizoma Nakai 的带叶柄基部的干燥根茎。主产于黑龙江、吉林、辽宁三省山区，习称“东北贯众”或“绵马贯众”。秋季采挖，洗净，除去叶柄及须根，晒干。 切片生用或炒炭用。