葛根花為植物葛根的葛根根花花。總狀花序15~30公分，花圖花中央較密；苞片線狀披針狀到線狀，片葛較小苞片較短；小苞片，圖片橢圓形，葛根根花小于2mm；花序軸上有2-3個花簇；花萼鐘狀，花圖8~10mm，片葛被短柔毛，圖片具披針狀的葛根根花裂片，稍長于萼筒；花冠10~12mm，花圖紫紅色，片葛倒卵形的圖片旗瓣。
功效：味甘、葛根根花辛，花圖性涼；歸脾、片葛胃經。具有解肌退熱，透疹，生津止渴，升陽止瀉的功效。
禁忌：虛寒者忌用，胃寒嘔吐者慎用。
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