Penny grass, also known as Pennycress, is a type of plant that belongs to the mustard family. This low-growing annual plant has clusters of small white or yellow flowers and round seed pods. It is a valuable plant as it can help in the management of soil erosion and typically grows on waste lands. Some common synonyms for penny grass include Field pennycress, Stinkweed, Thale Cress, and Fan Wort. Additionally, the scientific name for penny grass is Thlaspi arvense. This plant is often used in herbal medicine as it has antimicrobial and diuretic properties. Overall, penny grass is a versatile and useful plant that has many synonyms.