- Botanical name : Acorus calamus Linn.
- Family : Araceaea
- Malayalam : Vayamb
- Tamil : Vasampu
- English : Sweet flag
- Habit : Perennial terrestrial herb
- Useful part : Rhizome
- Rasa Panchaka
- Rasa : Katu,thikta
- Guna : Laghu, thikshna
- Veerya : Ushna
- Vipaka : Katu
- Karma : Kaphavatashamana
- Indications : Apasmara, sotha
- Dose : Churna – 0.5-1g (oushadhartha),vamanartha(1-3g)
- Formulations : Manasamithra vataka, vachadi thailam
