Genus of shrubs and trees which includes the Golden Wattle, floral emblem of Australia (6)
I believe the answer is:
acacia
(Other definitions for acacia that I've seen before include "Tropical shrub" , "Thorny shrub with yellow or white-flowers" , "Tree (wattle or robinia)" , "Tropical tree, inc. mimosa, wattle" , "Flowering shrub of the pea family" .)