In Botany is the sheath or dried cover of legume fruits. Dried dehiscent fruit Dehiscent capsule . By extension legume, legume . Siliqua (with q ) was the name of an ancient currency of Rome, is the name of a population in Sardinia and also the epithet of the scientific name of a carob class ( Ceratonia siliqua). It is also the genus of a class of marine molluscs.