ringworm bush: tropical shrub (especially of Americas) having yellow flowers and large leaves whose juice is used as a cure for ringworm and poisonous bites; sometimes placed in genus Cassia
senna: any of various plants of the genus Senna having pinnately compound leaves and showy usually yellow flowers; many are used medicinally
prime factor: the prime factors of a quantity are all of the prime quantities that will exactly divide the given quantity