Acacia retinodes (Wirilda)

Native to southeastern South Australia, this evergreen shrub or small tree develops an open, spreading crown and can reach about 20 feet tall. Its leaf-like structures are flattened leaf stalks called phyllodes. Rounded yellow flowerheads appear intermittently through the year, giving it a longer flowering season than many wattles. It is naturalized in Colombia, where it is recorded in Bogotá and Cundinamarca between about 8,400 and 9,200 feet. Photographed in Colombia.