The term Genus Picrasma refers to a group of flowering plants in the family Simaroubaceae. They are commonly known as bitter woods due to their bitter taste. The most well-known species in this genus is Picrasma excelsa, also known as the quassia tree, which is commonly used in traditional medicine for its antimalarial, antipyretic, and analgesic properties. Other species of the Genus Picrasma include Picrasma chinensis, Picrasma javanica, and Picrasma africana. Synonyms for this genus include Simaruba and Quassia. The plants are native to Asia, Africa, and tropical America and are typically found in moist forests and riverbanks.