Rheum nobile, the Noble rhubarb or Sikkim rhubarb or पदमचाल, is a giant herbaceous plant native to the Himalaya, from northeastern Afghanistan, east through northern Pakistan and India, Nepal, Sikkim (in India), Bhutan, and Tibet to Myanmar, occurring in the alpine zone at 4000–4800 m altitude. It is an extraordinary species of rhubarb (genus Rheum). At 1–2 m tall, R. nobile towers above all the shrubs and low herbs in its habitat, and it is visible across valleys a mile away.