1. Ricin is synthesized in the endosperm of castor oil plant seeds.

2. What does Caruncle mean? An outgrowth or appendage at or near the hilum of certain seeds, as of the castor-oil plant

3. Caruncle a small, fleshy swelling, such as the lacrimal Caruncle which is the red prominance at the inner corner of the eye. a wart-like growth present on the seeds of some ANGIOSPERMS, such as the castor oil plant, near to the MICROPYLE