Senna leaf, the same name Tanna leaf, Xiyeye, Soak bamboo leaf, originated from the small leaves of leguminous plant Senna angustifolia or Senna acuminate. 1.5~5cm long, 0.4~2cm wide, whole edge, sharp tip, slightly asymmetrical leaf base. Senna angustifolia is a small herbaceous shrub with a height of 1 meter. Native to dry and hot areas. It only takes 3-5 months from sowing to flowering.