The Ricinus communis is an erect, tropical shrub or small tree in the family Euphorbiaceae. It is a very fast growing plant. The joints of the hollow stem, stalks and leaves are reddish to purple. It is native to Assam. The Assamese common name of the plant is এৰা গছ (Era gach, Era, Era-goch). Other common names are castor bean, castor oil plant. The shape of leaves is palmately lobed, arrangement of leaves is alternate, and margin is coarsely serrate. The female flowers are the fuzzy red structures at the top of the flower spike with the male flowers positioned on the lower half, and have conspicuous yellow anthers. The oblong fruit turns brown when ripe. In each seed pod (a capsule) there are three seeds. The seeds of castor bean or castor oil plant, are very poisonous to people, animals and insects. The castor oil is extracted from the beans, which is used for medicinal purposes. Commercially prepared castor oil contains none of the toxin.
The world famous the domesticated silkworm, Philosamia ricini of Assam that feeds mainly on castor leaves.
Paste of Castor leaves is used for treatment of piles.
Scientific classification of castor plant :
Kingdom : Plantae
Phylum : Tracheophytes
Class : Equisetopsida C. Agardh
Order : Malpighiales
Family : Euphorbiaceae
Genus : Ricinus L.
Binomial name : Ricinus communis L.