Acacia, commonly known as wattles or acacias, is a genus of about 1084 species of shrubs and trees in the subfamily Mimosoideae of the pea family Fabaceae. Initially, it comprised a group of plant species native to Africa, South America and Australasia, but is now reserved for species mainly from Australia, with others from New Guinea, Southeast Asia and the Indian Ocean. The genus name is Neo-Latin, borrowed from the Greek ἀκακία, a term used by Dioscorides for a preparation extracted from the leaves and fruit pods of Vachellia nilotica, the original type of the genus. In his Pinax (1623), Gaspard Bauhin mentioned the Greek ἀκακία from Dioscorides as the origin of the Latin name.

తుమ్మ ఒక రకమైన దట్టంగా ముళ్ళతో కూడిన చెట్టు. ఇవి ఫాబేసి (Fabaceae) కుటుంబంలోని అకేసియా (Acacia) ప్రజాతికి చెందినవి. ఇది ముళ్లతో ఉండే కొమ్మలు, నల్లని బెరడు, పసుపు రంగులో ఉండే పువ్వులు కలిగి యుంటాయి.