Grasstree, a native plant found across Australia, is known by several synonyms. Some of the common synonyms include blackboy, balga, yacca, and spear lily. The blackboy name is derived from the plant's black trunk and spiky foliage, resembling a colonial-era boy. The balga name, on the other hand, is a Noongar term for the plant. Yacca is another name used in southern Australia and is closely related to the Spanish word yucca. Spear lily is a name given to grasstree due to its spear-like leaves. Despite the different synonyms, all of them refer to the same native Australian plant with unique characteristics.