senna, any plant of the genus Sennia (formerly placed in Cassia), leguminous herbs, shrubs, and trees of the family Leguminosae (pulse family), most common in warm regions. Some species are cultivated for ornament, but sennas are best known as medicinal plants. The dried leaves are used as a purgative and are chiefly obtained from S. acutifolia (Alexandria senna) and S. angustifolia (Indian senna); both trees are cultivated especially in S India. The wild senna (S. marylandica), a perennial of the E United States, has been similarly used. Golden shower (S. fistula) of India yields canafistula, a purgative extracted from the fruit pulp. The young shoots of several wild species are used for food and the seeds for a coffee substitute. S. nictitans, a North American herb, is sometimes called wild sensitive plant because its leaves respond to touch as do those of the true sensitive plant, a mimosa. Senna is classified in the division Magnoliophyta, class Magnoliopsida, order Rosales, family Leguminosae.

Senna can refer to:


  • Ayrton Senna (1960–1994), former Brazilian F1 driver and triple World Champion
  • Bruno Senna (born 1983), race car driver and nephew of Ayrton Senna
  • Danzy Senna (born 1970), novelist
  • Marcos Senna (born 1976), Brazilian-Spanish footballer
  • Márcio Senna (born 1981), Brazilian footballer, Marcos brother
  • Senna Guemmour, German singer and member of Monrose (2006–)



  • Sanandaj (or Sine), a Kurdish city in western Iran
  • Senna (poetic), an exchange of insults found in the Poetic Edda

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