知风草，中药名。为禾本科画眉草属植物知风草Eragrostisferruginea（Thunb.）Beauv.的根。植物知风草，分布几遍全国。具有舒筋散瘀之功效。主治跌打内伤，筋骨疼痛。
Zhi-feng-cao, name of Chinese Medicinal Material. The root of Eragrostis ferruginea (Thunb.) Beauv., a plant belonging to the Poaceae family. Zhi-feng-cao is widely distributed throughout the country. It has the functions of relaxing tendons and dispersing stasis, and is mainly used to treat injuries from falls, internal injuries, and pain in the tendons and bones.

功效作用 Efficacy and Functions

舒筋散瘀。
Relax tendons, activate blood circulation, and resolve stasis.

主治 Indications

跌打内伤，筋骨疼痛。
Traumatic injury and internal damage, with pain in the muscles and bones.

用法用量 Dosage and Administration

内服：煎汤，6-9g。外用：适量，捣敷。
Internal use: Decoction, 6-9g. External use: Appropriate amount, pounded for application.

相关论述 Relevant Discussion

《贵州民间药物》：“舒筋逐瘀。”
"Guizhou Folk Medicine": "Relaxing tendons and dispelling stasis."

临床应用 Clinical Application

治跌打损伤，知风草6g，大血藤15g，骚羊古9g。煎水兑酒服。（《贵州民间药物》）
For treating bruises and injuries, take 6g of Zhi Feng Cao, 15g of Da Xue Teng, and 9g of Sao Yang Gu. Decoct the herbs in water and mix with alcohol for consumption. (From "Guizhou Folk Medicine")

加工炮制 Processing and Preparation

采收加工：8月采挖，除去地上部分，洗净，晒干或鲜用。
It is harvested in August by digging up the plant, removing the aboveground parts, washing them clean, and then drying in the sun or using fresh.

植物学信息 Botanical Information

植物种属：禾本科画眉草属植物知风草。
The plant species is Eragrostis cilianensis, belonging to the Poaceae (grass) family and the genus Eragrostis.

形态特征 Morphological Characteristics

多年生草本。秆丛生或单生，直立或基部膝曲，高30-110厘米，粗壮，径约4毫米。叶鞘两侧极压扁，鞘口有毛，脉上有腺体；叶舌退化成1圈短毛；叶片扁平或内卷，较坚韧，背面光滑，表面粗糙，或近基部疏具长柔毛，长20-40厘米，宽3-3-6毫米。圆锥花序，开展，长20-30厘米，分枝单生，或2-3个聚生，枝腋间无毛；小穗柄有腺体；小穗长圆形，长5-10毫米，有7-12朵小花，紫色和紫黑色；颖披针形，有1脉，先端锐尖至渐尖；外稃卵状披针形，先端稍钝，侧脉明显而突出，第1外稃长约3毫米，内稃短于外稃，脊上具有小纤毛，宿存；花药长约1毫米。颖果棕红色，长约1.5毫米。花、果期8-12月。
Perennial herb. Stems are tufted or solitary, erect or geniculate at the base, 30–110 cm tall, stout, about 4 mm in diameter. Leaf sheaths are strongly compressed on both sides, with hairs at the mouth and glands on the veins; ligule reduced to a ring of short hairs; leaf blades flat or involute, tough, smooth abaxially, scabrous adaxially, or sparsely long-hairy near the base, 20–40 cm long, 3–6 mm wide. Inflorescence is an open panicle, 20–30 cm long, branches solitary or 2–3 clustered, axils glabrous; spikelet pedicels have glands; spikelets oblong, 5–10 mm long, with 7–12 florets, purple to purplish-black; glumes lanceolate, 1-veined, acute to acuminate; lemmas ovate-lanceolate, apex slightly obtuse, lateral veins prominent, first lemma about 3 mm long; palea shorter than lemma, keels ciliate, persistent; anthers about 1 mm long. Caryopsis reddish-brown, ca. 1.5 mm long. Flowering and fruiting from August to December.

生长环境 Habitat

生于路边、山坡草地。
Found along roadsides and on hillside grasslands.