The professional name of Job's tears is Coix lacryma, (Latin name: Coix?lacryma-jobi? L.) is a grass family, annual stout herb, with yellowish-white, spongy, fibrous roots, about 3 mm in diameter. Flowering and fruiting period June-December.

Rice kernel, is the seed kernel of Coix lacryma, also known as Coix lacryma, Gramineae, the seed kernel of Coix lacryma. Is China's specialty, is a medicinal food and plant seed kernel, its nature slippery, pharmacological experiments have proved that the rice kernel of the uterine muscle has an excitatory effect, prompting the uterus to contract and thus have the possibility of inducing miscarriage; rice kernel is the seed kernel of the plant Coix lacryma, also known as Coix lacryma. Because of its seed kernels and roots can be used in medicine, and the plant is similar to corn, some producing areas and called Coix lacryma for "medicine corn".